Ahmed W. Al Zand

Ahmed W. Al Zand
Universiti Kebangsaan Malaysia | ukm · Department of Civil Engineering

Doctor of Engineering

About

49
Publications
15,749
Reads
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417
Citations
Citations since 2016
43 Research Items
413 Citations
2016201720182019202020212022020406080100120140
2016201720182019202020212022020406080100120140
2016201720182019202020212022020406080100120140
2016201720182019202020212022020406080100120140
Additional affiliations
January 2020 - present
Universiti Kebangsaan Malaysia
Position
  • Professor (Associate)
Education
September 2013 - January 2017
Universiti Kebangsaan Malaysia
Field of study
  • Structural Engineering

Publications

Publications (49)
Article
Full-text available
This paper presents a numerical analysis of the piled-raft foundation (PRF) based on the actual behavior of supporting piles. The raft was modeled as a thin plate, while the piles were modeled as springs in different ways. This research also aims to propose an analytical model of piles based on actual behavior at fieldwork. The results proved that...
Article
Full-text available
Considering their cost and strength benefits over traditional reinforced concrete, steel-concrete-steel (SCS) structural systems have become increasingly popular. The ultimate strength, ductility index, failure modes, cost, environment, and energy absorption capacities of SCS filled with sawdust concrete were explored in this study to better unders...
Article
Concrete-filled steel tubes (CFST) have been increasingly used in the construction industry due to their favourable structural performance. With the increase of accidental events in the past two decades, researchers paid more attention to the response of CFST members under impulsive (lateral impact/blast) loading. Research projects conducted aim to...
Article
Full-text available
Intrinsically, lightweight aggregate concrete (LWAC) suffers from the low compressive strength and deformation capacity. This restricts the use of LWAC mainly to non-structural applications. Several studies have highlighted the potential of synthetic fiber-reinforced polymer (FRP) jackets for improving the substandard properties of the LWAC. Howeve...
Article
Full-text available
Hollow steel tubes members with different properties are being increasingly used for structural applications, such as columns in frame structures, roof structures, truss columns, and other applications. These structural members are primarily subjected to compressive and flexural loading. Due to the insufficient studies regarding the influence of th...
Article
Full-text available
The Concete-Filled Double Steel Tube (CFDST) members usually prepared from Concrete-Filled Steel Tube (CFST) member with additional internal steel tube, in order to increase strength and reduce the selfweight of the composite member. The conventional square cross-sections are usually used for the CFDST beams. However, these sectionsthis square sect...
Article
Full-text available
The concrete-filled steel tube (CFST) beams are recommended for adopting in the modern composite structure since it achieves a higher load capacity and ductility behaviour than the conventional structural members. Using CFST beams with slender steel cross-section led to reduce the overall cost of the structures compared to those with compact cross-...
Article
Full-text available
Composite slim floor systems are increasingly applied in the construction industry. Therefore, several experimental and numerical studies have been conducted to investigate the composite flooring systems and examine the various details that may affect the production of composite floors. This review paper summarises some important developments of co...
Article
Full-text available
A substantial number of experimental studies have reported on the flexural performance of concrete-filled steel tube (CFST) beams. Due to the problem complexity, theoretically modeling of the flexural bending capacity (Mu) and the flexural stiffness at the initial and serviceability limits (\(K_{{\text{i}}}\) and \(K_{{\text{s}}}\)) of CFST beams r...
Article
Full-text available
Salient features of lightweight aggregate concrete (LAC) include noticeable fire resistance, high strength-to-weight ratio, and low magnitude of dead loads. Further, LAC has a low cost, eases construction practices, and possesses an environment-friendly nature. On the downside, LAC has substandard mechanical properties in comparison to normal aggre...
Article
Full-text available
Several studies have highlighted the potential of crushed brick aggregates in non-structural concrete. This is because crushed brick aggregates offer substandard mechanical properties in comparison to natural stone aggregates. Synthetic Fiber Reinforced Polymer (FRP) sheets have been known to overcome this issue. However, enormous costs associated...
Article
Full-text available
The term "peak ground acceleration" (PGA) is frequently used to describe ground motions accurately. Identifying the ground motion components within a defined zone is critical for structural engineering design. The purpose of this study is to develop novel models for predicting the PGA using Artificial Neural Networks-Gravitational Search Algorithm...
Article
Full-text available
The aim of this paper is to investigate the flexural performance of a new steel–concrete composite beam system, which is required to carry higher loads when applied in flooring systems with less self-weight and cost compared with conventional composite beams. This new composite member is prepared by filling a single cold-formed steel C-section with...
Article
Full-text available
Several stress-strain models were used to predict the strengths of steel fiber reinforced concrete, which are distinctive of the material. However, insufficient research has been done on the influence of hybrid fiber combinations (comprising two or more distinct fibers) on the characteristics of concrete. For this reason, the researchers conducted...
Article
This paper researches a lightweight composite structure referred to as the Profiled Steel Sheeting Dry Board (PSSDB). It is fundamentally produced by connecting a Profiled Steel Sheeting to Dry Board using mechanical screws. It is mainly employed as floor panels. However, almost all studies have focused on researching the one-way structural perform...
Article
The profiled composite slab (PCS) is a composite structural system consisting of profiled steel sheet in-filled with concrete in the troughs and connected using studs. This system is a structural load bearing element. Lately, this system has been increasingly used as flooring or roofing structural element. The PCS has become as an extension or deve...
Article
This research investigates the performance of double C-purlin sections used in the concrete-filled steel tube (CFST) beams system. A recycled-lightweight concrete was used as infill material to reduce the newly suggested composite beam's self-weight and cost. Up to 70% of the raw coarse aggregate was replaced with the expanded polystyrene beads and...
Article
Full-text available
The flexural strength of Slender steel tube sections is known to achieve significant improvements upon being filled with concrete material; however, this section is more likely to fail due to buckling under compression stresses. This study investigates the flexural behavior of a Slender steel tube beam that was produced by connecting two pieces of...
Article
Full-text available
Recently, the concrete-filled twin-layer steel-sheet composite wall systems (TSCWs) have become recommended by the engineers in the modern structures, since it has high energy absorption, ductility, and capacity compared to the corresponding conventional wall systems. Therefore, this paper presents and discusses the literature of researches particu...
Article
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Accurate and reliable prediction of Perfobond Rib Shear Strength Connector (PRSC) is considered as a major issue in the structural engineering sector. Besides, selecting the most significant variables that have a major influence on PRSC in every important step for attaining economic and more accurate predictive models, this study investigates the c...
Article
Full-text available
Although the ductility energy ratio ( $$\mu_{E}$$ μ E ) of the reinforced concrete beam has been the topic of numerous study purposes and critical inquiry for the last decades, narrow consideration, especially in terms of reinforced concrete deep beams (RCDBs), is conducted to examine the ductility energy of hybrid-RC deep beams with various CFRP c...
Conference Paper
Polymer-based composite materials resulted from a combination of a variety of raw materials to form a new composite material. The use of a type of polymer-based composite material, known as the Glass Fibre Reinforced Polymer (GFRP) has been on the increase today. GFRP Industrialised Building System (IBS) has been developed in the form of prefabrica...
Article
Openings in steel plate shear walls (SPSWs) are usually used for decorative designs, crossing locations of multiple utilities and/or structural objectives. However, earlier studies showed that generating an opening in an SPSW has a negative effect on the cyclic performance of the SPSW. Therefore, this study proposes tripling or doubling the steel-s...
Article
Full-text available
The impacts of numerous important factors on the Energy Absorption (EA) of torsional Reinforced Concrete (RC) beams strengthened with external FRP is the main purpose and innovation of the current research. A total of 81 datasets were collected from previous studies, focused on the investigation of EA behaviour. The impact of nine different paramet...
Article
Full-text available
High-strength concrete (HSC) is highly applicable to the construction of heavy structures. However, shear strength (Ss) determination of HSC is a crucial concern for structure designers and decision makers. The current research proposes the novel models based on the combination of adaptive neuro-fuzzy inference system (ANFIS) with several meta-heur...
Article
Full-text available
High-strength concrete (HSC) is highly applicable to the construction of heavy structures. However, shear strength (Ss) determination of HSC is a crucial concern for structure designers and decision makers. The current research proposes the novel models based on the combination of adaptive neuro-fuzzy inference system (ANFIS) with several meta-heur...
Article
The outward steel tube buckling failure of concrete-filled steel tube (CFST) beams is still considered to be a serious concern due to the typical bending loads. This research conducts experimental and numerical investigations on the flexural performance of slender square steel tubes filled with normal concrete. A total of 6 cold-formed square CFST...
Article
The tube outward local buckling of Concrete-Filled Steel Tube (CFST) beam under high compression stress is still considered a critical problem, especially for steel tubes with a slender section compared to semi-compact and compact sections. In this study, the flexural performance of stiffened slender cold-formed square tube beams filled with normal...
Article
This paper presents new empirical methods to theoretically predict bending moment capacity (M u) and flexural stiffness values at the initial and serviceability levels (K i and K s) of concrete-filled steel tube (CFST) composite beams. A wide range of results for M u , K i , and K s covering various parameters of CFST beams are required to develop...
Article
The performance of simply supported concrete-filled steel tube (CFST) beams strengthened with unidirectional carbon fiber–reinforced polymer (CFRP) sheets was investigated. Twelve circular and rectangular beams were tested under flexure. Different CFRP strengthening configurations were investigated. In addition, a nonlinear finite-Element (FE) anal...
Article
Full-text available
The performance of continuous composite deck slab (CCS) strengthenedwith unidirectional carbon fibre-reinforcedpolymer (CFRP) laminate in the hogging region was investigated in this study, where the CFRP worked asanexternal reinforcement in the concrete tension region. Four specimens of CCS that consisted of two equal spans were tested experimental...
Article
In slim-floor construction, the web opening of the steel beam is proposed as WO shear connectors of different shapes; square (WSO), rectangular (WRO) and circular (WCO) connectors were considered to evaluate the ultimate shear strength, failure mode and ductility performance. Six push-out tests were conducted under static loading. Finite Element (F...
Article
This study investigated the behaviour of the simply supported hollow steel tube (HST) beams, either concrete filled or unfilled when strengthened with carbon fibre reinforced polymer (CFRP) sheets. Eight specimens with varied tubes thickness (sections classification 1 and 3) were all tested experimentally under static flexural loading, four out of...
Article
This paper presents the development of finite element (FE) models to simulate the behavior of diagonally stiffened steel plate shear wall systems (SPSWs) with differently shaped openings subjected to a cyclic load. This walling system has the potential to be used for shear elements that resist lateral loads in steel-framed buildings. A number of ½-...
Article
Full-text available
The paper presents Finite Element Analysis to determine the ultimate shear capacity of tapered composite plate girder. The effect of degree of taper on the ultimate shear capacity of tapered steel-concrete composite plate girder with a nonlinear varying web depth, effect of slenderness ratio on the ultimate shear capacity, and effect of flange stif...
Article
Full-text available
Three series of steel-plate single-strap joints bonded by Carbon-Fibre Reinforced Polymer (CFRP) sheets, which are used with an adhesive material, are investigated in this study. Experimental and finite element (FE) analyses using ABAQUS software are employed for this purpose. The main objective of this study is to provide further understanding of...
Article
This paper investigates the structural performance of the Profiled Steel Sheeting Dry Board (PSSDB) system; a lightweight composite structure which is made by binding a Profiled Steel Sheeting (PSS) to a Dry Board (DB) by mechanical screws. Many studies indicated that it can be used as flooring units. However, most of them focused on utilizing the...
Article
The behaviour of plate girders has been extensively studied during the past few decades. Extensive lab work, analytical methods, and numerical analyses, have been used in order to: understand the behaviour of plate girders, come out with new design methods for the primary design purpose, time consuming, and the economical purpose. This review paper...
Article
Recently, concrete-filled steel tubular (CFST) members are becoming highly recommended by engineers for use in composite structures. Lately, carbon fiber-reinforced polymer (CFRP) composite materials have been used for strengthening steel and CFST flexural members. Both experimental and numerical studies are adopted in this research to further inve...
Article
Full-text available
In order to understand further the influence of using the concrete-filled steel tube (CFST) composite beams in the modern structural projects, the flexural and energy absorption capacities of simply supported rectangular hollow steel tube (HST) beams filled with normal concrete was investigated in this study. Eight downscale specimens (HST and CFST...
Article
Full-text available
Nonlinear finite element (FE) models are prepared to investigate the behaviour of concrete-filled steel tube (CFST) beams strengthened by carbon fibre reinforced polymer (CFRP) sheets. The beams are strengthened from the bottom side only by varied sheet lengths (full and partial beam lengths) and then subjected to ultimate flexural loads. Three sur...
Article
Concrete-filled steel tube (CFST) beam, like any conventional structural member, for several reasons need strengthening, such as by making upgrades to carry extra loads or to make repairs owing to degradation attributed to aging, fire, and fatigue. This study experimentally investigates the strengthening behaviour of the circular and rectangular si...
Article
This paper presents a finite element (FE) model, which is validated and developed to simulate the axial load behavior of an existing experimental composite wall consisting of double-skinned profiled steel sheet (PSS) in-filled with normal concrete. This type of wall is designed to resist the axial load in the composite structure buildings. The perf...
Article
Full-text available
The behavior of double-skinned composite walls (DSCWs), with or without infill materials, has been extensively investigated during the past few decades through analytical, experimental, and numerical methods. These investigations have resulted in new design methods for primary design objectives as well as time saving and economical purposes. This p...
Article
Concrete-filled steel tubes (CFSTs) have become the most recommended composite structural members in many modern structures. These members may need upgrading or strengthening like any conventional structural members for many reasons. In this research, Finite element (FE) models are prepared to investigate the behavior of square CFST beams, partiall...
Research
Full-text available
The behaviour of Concrete-Filled Steel Tube (CFST) beam strengthened with Carbon Fibre Reinforced Polymer (CFRP) sheet was investigated numerically in this paper. Nonlinear analysis using ABAQUS Finite Element (FE) software to assess the behaviour of square and circular CFST beams wrapped from bottom side with U-shaped of CFRP sheet using different...
Article
This study investigates the axial load behavior of an existing composite wall consists of a double-skinned profiled steel sheet in-filled with normal concrete. Three different composite walls in three-dimensional finite element models were developed, i.e. profiled steel sheet (PSS), core concrete, and the full composite wall system. The models were...
Conference Paper
Full-text available
Three important parameters of rectangular concrete-filled steel tube (CFST) beams, namely, weight, cost, and ultimate moment capacity, are investigated in this research to establish the validity of using this type of composite member in the modern construction projects. Finite element (FE) analysis with ABAQUS software was performed to implement th...
Article
Full-text available
Finite element (FE) models are developed to investigate the axial load behavior of a composite wall that consists of a double-skinned profiled steel sheet (PSS) in-filled with normal concrete and strengthened with embedded rectangular cold-formed steel (CFS). In this study, axial load behavior is compared between the FE models and an existing exper...

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