Renyuan QinCity University of Hong Kong | CityU · Department of Civil and Architectural Engineering
Renyuan Qin
Doctor of Philosophy
About
31
Publications
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Introduction
Publications
Publications (31)
Tuned inerter damper (TID) has been introduced and investigated to improve the damping performance of the mid-story isolation system in this study. TID in this novel system is arranged into the mid-story isolation system to utilize its weak transition layer enhancing damping effects. To achieve the best results, the closed-form optimization solutio...
A damped outrigger system (DO) has been proposed to enhance the seismic performance, in which links between outriggers and perimeter columns are artificially disconnected and implemented by dampers. Such an operation essentially destroys the structural integrity and becomes a potential threat for structural safety. Moreover, its performance is very...
Carbon fiber-reinforced polymer (CFRP) composite has been increasingly used in constructions, which is subjected to external loads that cause severe nonlinear vibrations and final structural failure. In this work, a machine learning approach is adopted to investigate nonlinear vibrations of CFRP composite. A dataset about nonlinear frequency ratios...
The shear strength prediction of concrete beams reinforced with FRP rebars and stirrups is one of the most complicated issues in structural engineering applications. Numerous experimental and theoretical studies have been conducted to establish a relationship between the shear capacity and the design variables. However, existing semi-empirical mode...
With the resource shortage in coastal areas, the construction of concrete structures using freshwater and river sand has brought great economic and environmental costs. The use of seawater, sea sand, and coral aggregates in concrete mixes has become an alternative solution for coastal and marine structures, especially for offshore structures and ar...
Highly crosslinked thermoset plastic waste is generally regarded as unrecycled materials and dumped into landfills. To divert the waste from landfills, recycling thermoset waste as fine particles in cementitious composites is a potential approach. However, weak interface bonding between thermosets and cement hydrates causes significant strength deg...
Chemical functionalization is an effective approach to address interfacial deterioration caused by environmental exposure in cellulose nanofiber (CNF)-epoxy nanocomposites. However, how functionalization affects interfacial deterioration and durability of nanocomposites in erosive environment is still lacked. In this work, the global mechanical pro...
Used engine oil (UEO) accumulation increases the risk of urban environment through soil contamination and water pollution. Incorporating UEO into concrete as chemical admixtures is a feasible approach for its disposal, since it can serve similar functions to water reducing agents and air entraining admixtures in developing sustainable and durable c...
One-dimensional carbon-based nanomaterials, such as carbon nanotube (CNT) or carbon nanofiber (CNF) have been regarded as ideal candidates to form nanocomposites for the fabrication of high-performance cementitious materials. Although CNT, CNF and nanocellulose possess different mechanical properties, the mechanical enhancement of CNT, CNF or nanoc...
The rapid construction of innovative structures and megastructures is pushing the development of steel fiber reinforced cementitious composite (SFRCC). The interfacial enhancement technology from nano to macroscale for improving global properties of SFRCC is summarized here, including nanomaterials reinforcement of cementitious matrix, physical arr...
Background
Concerns had been raised for the potential hazard of SARS-CoV-2 transmissions via aerosols and fluid droplets during cataract surgeries amid the COVID-19 pandemic. This study aims to evaluate the rate of visible aerosol generation and fluid spillage from surgical wounds during phacoemulsification in human subjects.
Methods
This is a pro...
Wood has been widely used in construction and infrastructures due to its great environmental and economic benefits. However, wood structures are highly vulnerable to fire because of its flammability. The effect of unavoidable service load on the structural performance and charring characteristics of wood structures is still unclear, posing serious...
Wood is one of natural composites and characterized as a renewable resource with great environmental benefits in construction and building industry. Since its mechanical properties are highly sensitive to environmental humidity and temperature, the key issues for wood application are reliability and durability. Fiber reinforced polymer (FRP) is a g...
Layered material systems are widely seen in various engineering applications such as thin films circuit boards in electronic engineering, lipid bilayer in biological engineering, and adhesive bonding in aerospace and civil engineering applications. However, the durability of the material interface can be seriously affected due to the prolonged expo...
To alleviate resource shortage and environmental problems, a combination of fiber reinforced polymer (FRP) and seawater concrete is an attractive option for replacing conventional reinforced concrete in marine structures. The chloride ions in concrete structures increase with extension of service time due to penetration from the marine environment,...
Defects between fiber reinforced polymer (FRP) and repaired concrete components may easily come out due to misoperation during manufacturing, environmental deterioration, or impact from external load during service life. The defects may cause a degraded structure performance and even the unexpected structural failure. Different non-destructive tech...
In this study, we develop a tomographic technique based on the use of both mechanical wave (i.e. stress wave and acoustic wave) and electromagnetic wave (i.e. laser beam) for evaluating the defects in tree trunk. In the experimental work, the tomographic technique was used to inspect tree trunk with an air hole fabricated at the centric position an...
New-to-old concrete interfaces can be widely seen in the process of repairing or strengthening concrete structures, such as concrete jacketing and concrete overlay or repair mortar (high performance fiber reinforced one included etc.) or self-consolidated concrete or self-consolidated mortar. One major difference between new and old concrete is tha...
An innovative tree defect detection scheme, which combines acoustic-laser technique and sonic tomography, is studied. A new sensor distribution can be adopted based on the near-surface response detected by acoustic-laser technique, and a more reliable image of the tree trunk can be observed by sonic tomography. By using such hybrid detection scheme...
Bonding fiber reinforced polymer (FRP) has been proven as an effective and efficient method to strengthening and/or retrofitting deficient concrete components and structures. Interfacial defects may easily arise due to improper construction or environmental deterioration during the designed service life and they may cause an unfavorable effect on t...