Jun-Jie Zeng

Jun-Jie Zeng
GuangDong University of Technology

PhD
Professor, Guangdong University of Technology; ARC DECRA Fellow

About

83
Publications
10,204
Reads
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1,548
Citations
Introduction
Education
January 2013 - September 2017
The Hong Kong Polytechnic University (Supervisor: Prof. J.G. Teng)
Field of study
  • FRP-confined RC columns

Publications

Publications (83)
Article
This study experimentally and analytically investigated the compressive behaviour of partially FRP confined concrete, with emphasis on its strain localization phenomenon. An experimental programme was conducted first, in which both fully and partially FRP confined concrete specimens were tested under axial compression. The global deformation as wel...
Article
Bond behavior between steel bars and concrete is likely to be significantly degraded after exposure to high temperatures in a fire, which will influence the residual strength of the reinforced concrete (RC) member and the selection of appropriate repair and strengthening solutions. This paper presents an analytical model for predicting the bond beh...
Article
Flexible-sleeve perfobond strip connectors (SPBL), consisting of perfobond strip connectors (PBLs) and flexible plastic sleeves surrounding transverse rebars, are considered to be an effective and ductile solution in combining steel and concrete members together in composite structures. In order to evaluate structural performance of this type of sh...
Article
Full-text available
Geopolymer-bonded fiber-reinforced polymer (FRP) microbar is an emerging strengthening system for concrete structures, owing to the excellent geopolymer/concrete bond and the superior moisture and fire resistance of geopolymer matrix (compared to organic bonding adhesives). To apply this strengthening system, the bond performance between FRP microb...
Article
In this short communication, a series of novel forms of tubular members made of fiber-reinforced polymer (FRP) grid reinforced ultra-high-performance concrete (UHPC) (referred to as "FRP-UHPC tubular members") are developed. FRP-UHPC tubular members have excellent mechanical properties, and their excellent performances are demonstrated through thre...
Article
Fiber-reinforced polymer (FRP) confinement has been proposed to mitigate the detrimental effects of coal rejects concrete (CRC) in the present study. Polyethylene terephthalate (PET) FRP jacket was adopted to confine CRC as a new type of novel column members, which are referred to as PET FRP-confined coal reject columns (PFCCRs). PFCCRs are often s...
Article
Partial fiber-reinforced polymer (FRP) wrapping has become an attractive strengthening techque for reinforced concrete (RC) columns. Apart from FRP full wrapping strengthening techque, FRP partial wrapping using FRP spiral strips leads to some advantages such as better fire resistance. However, existing study on FRP spiral strip is limited and the...
Article
As an environmental-friendly material with high rupture strain capacity, polyethylene terephthalate (PET) fiber reinforced polymer (FRP) has promising industry applications. Previous studies mainly focused on the application of PET FRP-confined concrete in circular columns, while investigations on PET FRP-confined concrete in square columns are rat...
Article
Large rupture strain (LRS) fiber-reinforced polymer (FRP) composites, including polyethylene naphthalate (PEN) FRP and polyethylene terephthalate (PET) FRP composites, have become increasing popular in civil construction. PET FRP and PEN FRP can be recyclable and thus they are environmentally friendly. However, the durability of LRS FRP composites...
Article
Passive energy dissipation devices are a widely accepted solution used to improve the response of the structures under seismic conditions. While several types of passive energy dissipation elements have been proposed for replaceable elements, buckling restrained braces (BRB) was one of the most effective replaceable elements which has been used to...
Article
Hybrid fiber-reinforced polymer (FRP)-concrete-steel double-skin tubular beams (DSTBs) have a very ductile load–deflection response but may experience a relatively large slip between the concrete and the inner steel tube. Perfobond (PBL) shear connectors, which have a perforated steel plate with transverse reinforcing bars passing through the perfo...
Article
To tackle the challenge of steel corrosion in conventional reinforced concrete (RC) structures, particularly in maritime environment, the implementation of glass fiber reinforced polymer (GFRP) bars in seawater sea-sand concrete (SSC) structures becomes increasingly popular due to their excellence corrosion resistance. However, the bond characteris...
Article
Full-text available
Concrete-filled steel tube (CFST) columns have been widely used in onshore constructions. To extend its applications to coastal/offshore structures and meanwhile relieve the overexploitation on freshwater and river sand, an FRP-confined seawater sea-sand concrete-filled stainless steel tube (F-SSCFSST) column is proposed. The cyclic axial compressi...
Article
Fiber-reinforced polymer (FRP)-concrete-steel double skin tubular columns (DSTCs) are a form of novel hybrid column with a particular merit of lightweight due to the existence of the void core, leading to a prosperous future of DSTCs in structures of lightweight and excellent performance. Utilization of high-strength materials (e.g., high-strength...
Article
Full-text available
Fiber-reinforced polymer (FRP) composites have been widely used for strengthening or constructing structures due to their excellent corrosion resistance and high tensile strength. An emerging hybrid structural member form with FRP composites—which consist of a steel section as internal reinforcement, an external FRP wrap/tube, and concrete filled b...
Article
Current axial stress–strain models of FRP-confined concrete mainly focus on FRP-confined normal concrete, the research work on studying the stress–strain behavior of FRP-confined ultra-high performance concrete (UHPC) is limited so far. To fill this research gap, this study develops a new design-oriented stress–strain model to predict the stress–st...
Article
Concrete-filled fiber reinforced polymer (FRP) tube (CFFT) members have become increasing popular, while the study on CFFT beams especially hollow CFFT beams is rather limited. This paper presents an experimental study on the flexural behaviour of hollow concrete-filled rectangular glass fiber reinforced polymer (GFRP) tubes beams. A total of six b...
Article
Fiber-reinforced polymer (FRP) wraps as external confining device have been employed to enhance the performance of concrete-filled steel tube (CFST) columns, and the axial compressive behavior of FRP-confined CFST columns have been intensively investigated. Although FRP confinement could enhance the mechanical performance of CFST columns with a hig...
Article
Full-text available
The implementation of shape modification (SM) to reinforced concrete (RC) columns has been demonstrated to be effective when enhancing the effectiveness of the fiber-reinforced polymer (FRP) confinement of the columns, particularly for non-circular columns. The SM approach generally includes modifying a square section into a circular one, modifying...
Article
In this study, a novel form of tubular permanent formwork that is made of ultra-high-performance concrete (UHPC) internally reinforced with fiber-reinforced polymer (FRP) micro-bars (herein referred to as FRP-UHPC tubular permanent formwork or simply FRP-UHPC tubular column) is developed. The axial compression test results of FRP-UHPC tubular colum...
Article
Concrete structures reinforced with fiber-reinforced polymer (FRP) bars (referred to as FRP-RC structures) are becoming increasingly popular, whereas there is a lack of a robust full-range axial load-strain model for FRP-RC columns, which is fundamental for the design and advanced analysis of FRP-RC structures. To this end, a review and assessment...
Article
Although concrete-filled fiber-reinforced polymer (FRP) tube (CFFT) columns (CFFTs) have become increasingly popular, CFFTs has a weak bending performance as the orientation of the fibers in the FRP tube is generally close to the transverse direction. To this end, this paper proposes novel Concrete-Filled FRP Tube columns internally reinforced with...
Article
High-performance cementitious composites, such as engineered cementitious composites (ECCs) with strong tensile strain-hardening behavior or ultra-high performance fiber-reinforced cementitious composites (UHPFRCCs) with excellent compressive behavior, have been widely used in civil engineering. In cases that UHPFRCC strengthening layer without int...
Article
Steel-fiber composite bars (SFCBs), which consists of a steel core and a fiber-reinforced polymer (FRP) pultruded protective coating, are a type of composite reinforcing bars. Although FRP bars have an excellent corrosion resistance, reinforced concrete (RC) beams reinforced with FRP bars may exhibit inferior ductility to beams reinforced with SFCB...
Article
Fibre-reinforced polymer (FRP) bars have become increasingly popular as internal reinforcement in reinforced concrete (RC) structures due to their excellent corrosion resistance. However, the compressive strength of FRP bars is generally much inferior to their tensile strength due to fibre micro-buckling under compression, and their transverse shea...
Article
Fiber reinforced polymer (FRP)-reinforced seawater sea-sand concrete (SSC) structures are prospective substitutions for traditional steel-reinforced concrete structures, especially in maritime environment. To demonstrate the feasibility of the FRP-reinforced SSC structures, an in-depth understanding on the bond strength of glass FRP (GFRP) bars to...
Article
Ultra-high performance concrete (UHPC) usually exhibits a weak ductility under axial compression. However, the ductility can be enhanced by implementing confining devices such as fiber-reinforced polymer (FRP) wraps. In order to gain in-depth understandings on the compressive behavior of FRP-confined UHPC, axial compression tests on 52 FRP-confined...
Article
Fiber-reinforced polymer (FRP) confinement has been demonstrated to be efficient in enhancing the deformation and strength capacities of concrete, while Polyethylene terephthalate (PET) FRP-confined concrete easily exhibits a strain-softening stress-strain behavior, especially that in square columns. In this study, novel PET FRP-confined FRP spiral...
Article
The polyethylene naphthalene (PEN) and polyethylene terephthalate (PET) fibers have a tensile rupture strain of over 5%, and hence they are referred to as large-rupture-strain (LRS) fiber reinforced polymer (FRP) materials. Their large rupture strain characteristics may contribute to significant improvement of the impact resistance of reinforced co...
Article
Externally bonded fiber-reinforced polymer (FRP) composites are increasingly used to confine concrete columns as an effective strengthening technique. During the past two decades, a significant research effort has focused on the performance of FRP-strengthened concrete structures under fire exposure. However, there is still a lack of research on th...
Article
Hybrid fibre-reinforced polymer (FRP)-concrete-steel double-skin tubular column (DSTC) is a new form of composite column that consists of an outer FRP tube and an inner steel tube, with the space between them filled with concrete. Although many studies have been conducted on the hybrid DSTC, studies on its lateral impact behaviour are very limited....
Article
This paper presents the results of an experimental study aimed at investigating the effects of strain rate and temperature on the tensile mechanical properties of polyethylene naphthalene (PEN) fiber bundles by using a drop-weight impact system. A total of 65 specimens with a gauge length of 25 mm were prepared and tested. The test variables includ...
Article
This paper presents an experimental study on the impact performance of concrete columns confined with large-rupture-strain (LRS, rupture strain≥5%) fiber reinforced polymer (FRP) jackets. A total of 32 concrete specimens were prepared and tested using large-capacity drop-weight equipment. The test variables included four impact height (2, 3, 4 and...
Article
The compaction state and the paste volume of concrete may significantly influence the compressive behaviour of concrete-filled steel tube (CFST) columns. This study presents an experimental investigation to the axial compressive behaviour of elliptical CFST (ECFST) column consisting of a high-strength steel (HSS) tube and a self-compacting concrete...
Article
FRP spiral strip wrapping strengthening technique is effective in enhancing strength and deformation capacity of reinforced concrete (RC) columns. Although some investigations have been conducted on axial monotonic compressive behavior of FRP spiral strip-confined concrete, cyclic compressive behaivor of FRP spiral strip-confined concrete has never...
Article
The confinement mechanism of concrete fully confined with fiber-reinforced polymer (FRP) jacket (FRP-jacketed concrete) is different from that of concrete partially confined with FRP (i.e., FRP ring-confined concrete and FRP tie-confined concrete) in that the confinement in the latter is non-uniform along the longitudinal direction. In order to bui...
Article
In this study, a novel ultra-high-performance concrete (UHPC) composite plate that is reinforced with a fibre-reinforced polymer (FRP) grid (herein FRP-UHPC composite plate) is developed and reported. The durability and mechanical performance of FRP-UHPC composite plates in harsh environments are expected to be superior to conventional materials wh...
Article
A novel technique to improve the effectiveness of fiber-reinforced polymer (FRP) confinement for strengthening rectangular reinforced concrete (RC) columns is to implement section curvilinearization (SC) before FRP wrapping. In this SC technique, the four flat sides of a rectangular column are transformed into slightly curved sides, which increases...
Article
Elliptical concrete-filled steel tube (ECFST) columns have been widely used, while they suffer deterioration due to various reasons. On the other hand, the concrete in ECFST columns is ineffectively confined due to the non-uniform confinement and the elliptical steel tube in ECFSTs is easy to experience buckling failure. To this end, fiber-reinforc...
Article
Fiber-reinforced polymer (FRP)-concrete-steel double skin tubular columns (DSTCs), which possess an outer FRP tube, an inner steel tube and sandwiched concrete between both tubes, are a kind of hybrid column with a particular merit of lightweight. It is expected that using high-strength materials (i.e., ultra-high strength concrete (UHSC) and high-...
Article
Fiber-reinforced polymer (FRP) composites have been widely used in civil engineering for either strengthening existing deteriorated reinforced concrete (RC) structures or constructing new structures. Recently, a new category of FRP composites with a large rupture strain (i.e., referred to as “LRS FRP” in this article) has become increasingly popula...
Article
Although concrete-filled steel tube (CFST) columns have been widely accepted in applications, they suffer deterioration due to various reasons. On the other hand, the concrete and the steel in CFST columns subjected to compression are not perfectly bonded at the initial loading stage. To this end, fiber-reinforced polymer (FRP) rings are proposed t...
Article
h i g h l i g h t s Compressive behavior of PET FRP/CFRP-wrapped SSC in square columns was investigated. The type and thickness of FRP jackets and the blending water of SSC were test variables. The accuracy of typical confinement models for FRP-wrapped square concrete columns was examined. a b s t r a c t Seawater sea-sand concrete (SSC) has attrac...
Article
Full-text available
Adopting fiber-reinforced polymer (FRP) composites as a confining device and a protective skin not only allows usage of sea-sand concrete which is generally forbidden in conventional steel reinforced concrete structures , but also leads to enhancement of concrete strength and deformation capacity. This paper presents a pilot study on axial compress...
Article
Polyethylene terephthalate (PET) fibre-reinforced polymer (FRP) composites are an emerging form of composites based on recycled PET fibres and have a large rupture strain. A novel form of hybrid columns with PET FRP tubes, i.e., square PET FRP-confined concrete encased high-strength steel (HSS) hybrid columns (referred to as PET FRP-confined concre...
Article
The behavior of FRP-confined concrete (FCC) under quasi-static compressive loadings is well understood, while the research on dynamic compressive behavior of FCC has hitherto been rarely reported. An experimental program consisting of Split Hopkinson Pressure Bar (SHPB) impact tests and quasi-static compression tests on FCC is conducted and the res...
Article
This paper presents a study on novel rectangular fiber-reinforced polymer (FRP)-concrete-high strength steel (HSS) hybrid column form which is termed as rectangular double-tube concrete columns (DTCCs). The DTCCs consist of a rectangular FRP tube filled with concrete and an elliptical HSS tube as internal reinforcement. The inner elliptical steel t...
Article
Fiber-reinforced polymer (FRP) composites have become widely accepted in the strengthening or seismic retrofitting of reinforced concrete (RC) columns in practice. FRP-confined rectangular concrete columns under concentric axial compression have been extensively studied, leading to many stress-strain models (i.e., concentric-loading stress-strain m...
Article
Hybrid fiber-reinforced polymer (FRP)-concrete-steel double-skin tubular columns (DSTCs) have received extensive attention in the research community over the past decade. Generally, a DSTC consists of an inner steel tube and an outer FRP tube, with the space between them filled with natural aggregate concrete (NAC). This paper studied a new form of...
Article
The novel form of hybrid columns, being fiber-reinforced polymer (FRP)-concrete-steel solid columns (FCSSCs), involves the FRP tube and the steel tube as the confining system for the concrete. The buckling of the inner steel in FCSSCs is effectively delayed by the surrounding concrete while the strength of the steel is sufficiently utilized, with i...
Article
The lateral impact behavior of hybrid FRP-ultra-high performance concrete (UHPC)-steel double-skin tubular columns (DSTCs) was experimentally investigated in this study. Seven specimens, which had an outer diameter of 168 mm and a length of 2000 mm, were tested under lateral impact loading. Different parameters, including the axial force level, imp...
Article
Full-text available
Existing studies have shown that fiber-reinforced polymer (FRP) jacketing/wrapping is highly effective in strengthening circular concrete columns but is much less effective for rectangular/square concrete columns due to the existence of flat sides and sharp corners in the latter. Rounding the corners can enhance the effectiveness of FRP confinement...
Article
This paper presents the concept and investigations on a new column form, namely, concrete-filled fiber-reinforced polymer-steel wire reinforced thermoplastics pipe (FRP-SRTP) columns (CFFSCs) which consist of a SRTP tube with an outer FRP confinement system and the concrete filled in the core area. A series of axial compression tests were performed...
Article
This paper presents the results of an experimental program on the behavior of fiber-reinforced polymer (FRP)-concrete-high strength steel solid columns (FCSSCs), with an outer polyethylene terephthalate (PET) FRP tube and an inner circular high-strength steel (HSS) tube, under cyclic axial compression. A PET FRP tube has a much larger rupture strai...
Article
Polyethylene terephthalate (PET) fiber-reinforced polymer (FRP) composites, which are made from recycled PET products and exhibit large rupture strain (LRS), have gained more and more attention in recent years on account of their environmentally friendly origin. One promising application of such fibers is in the confinement of concrete. Research is...
Article
In this study, the axial compressive behavior of fiber-reinforced polymer (FRP)-confined recycled glass aggregate concrete (RGAC) was experimentally investigated. In the FRP-confined RGAC, the FRP, a high performance material with high strength and excellent corrosion resistance, is utilized both as confinement and cover to the core concrete in ord...
Article
This article presents a comparative study on behavior of fiber-reinforced polymer–confined concrete in axially loaded circular columns strengthened using three different fiber-reinforced polymer partial wrapping strengthening schemes: the fiber-reinforced polymer ring wrapping, the fiber-reinforced polymer strip helical wrapping, and the novel fibe...
Article
Self-compacting concrete is quite commonly used in concrete-filled steel tube structures, but the compaction level of the self-compacting concrete, that is, the percentage of volume occupied by materials other than air void, within the steel tube is seldom investigated. The authors are of the view that the concrete mix proportions of the self-compa...
Article
Fatigue behavior of main load-bearing reinforced concrete (RC) members of highway bridges is heavily influenced by service environmental attacks and vehicle random loads. To investigate the fatigue behavior of RC beams strengthened with CFRP on highway bridges served under hot-wet environments and vehicle random loads, a novel environmental fatigue...
Chapter
Fiber-reinforced polymer (FRP) jacketing or wrapping has become an attractive strengthening technique for concrete columns. Within this strengthening technique, FRP composites are wrapped around the concrete column with the fibers in the jacket being oriented in the hoop direction. In practice, the FRP jackets can be either continuous or discontinu...
Article
Full-text available
Fiber-reinforced polymer (FRP) has become increasingly popular in repairing existing steel-reinforced concrete (RC) members or constructing new structures. Although the quasi-static axial compression performance of FRP-confined concrete (FCC) has been comprehensively studied, its dynamic compression performance is not well understood, especially th...
Article
This paper presents the results of an experimental program aiming to investigate the effect of the specimen size on the axial compressive behavior of circular concrete columns wrapped with spaced FRP rings. A database consisting of the up-to-date test results on FRP ring-confined concrete in the literature is established, and it is used for proposi...
Article
This paper presents the results of an experimental program aiming to investigate the effect of the specimen size on the axial compressive behavior of circular concrete columns wrapped with spaced FRP rings. A database consisting of the up-to-date test results on FRP ring-confined concrete in the literature is established, and it is used for proposi...
Chapter
Existing research has demonstrated that FRP confinement is effective for circular columns, whereas it is less effective for square columns. The lower FRP confinement effectiveness in a square column is predominantly attributed to the non-uniform FRP confinement in the column, while the concrete in an FRP-confined circular column is uniformly confin...
Article
Full-text available
Strengthening existing reinforced concrete (RC) columns using a partial wrapping strengthening technique (PWST) by fiber-reinforced polymer (FRP) strips has been widely implemented. However, compared with the confinement mechanism of confined concrete in columns strengthened with the FRP full wrapping strengthening technique (FWST), the confinement...
Preprint
Double-tube concrete columns (DTCCs) are a novel form of hybrid columns which consist of an outer fiber-reinforced polymer (FRP) tube, an inner circular high-strength steel (HSS) tube and the concrete filled in the entire section. In a DTCC, the inner HSS tube not only effectively diminishes the non-uniformity of stress distribution of concrete in...
Article
Fiber-reinforced polymer (FRP) jacketing has become an attractive technique for strengthening/retrofitting reinforced concrete (RC) columns. Extensive research has been conducted on FRP-confined rectangular columns under axial compression, leading to a significant number of stress-strain models for FRP-confined concrete in these columns. However, m...
Article
Abstract: Strengthening existing steel beams with externally bonded carbon fiber-reinforced polymer (CFRP) plate has attracted many interests in the research community. Debonding of the CFRP plate is the dominant failure mode in a flexurally strengthened steel beam, and the debonding failure is controlled by the interfacial responses between the CF...
Article
Fiber-reinforced polymer (FRP) wrapping has become an attractive strengthening technique for concrete columns. Within this strengthening technique, FRP jackets are wrapped around the concrete column with the fibers in the jacket being oriented in the hoop direction. In practice, the FRP jackets can be either continuous or discontinuous along the co...
Article
Full-text available
Fiber-reinforced polymer (FRP) jacketing/wrapping has become an attractive strengthening technique for concrete columns. Wrapping an existing concrete column with continuous FRP jackets with the fiber in the jacket being oriented in the hoop direction is referred to as FRP full wrapping strengthening technique. In practice, however, strengthening c...