| Urbanization has led to increased attention and utilization of prefabricated buildings in urban construction.While prefabricated buildings offer advantages such as faster construction time and greater efficiency,and prefabricated buildings still face challenges need to be addressed such as high production costs,resource waste,and difficulties in controlling construction quality.Modular integrated construction(Mi C)is an innovative achievement in the development of prefabricated buildings that has emerged as a significant player in engineering construction.In addition to high project quality,fast construction speed,minimal resource waste,low energy consumption.The biggest advantages of Mi C are the economic benefits of increased productivity and the ability to provide building professionals with improved forecasting capabilities in terms of life-cycle costs,energy performance and environmental impacts.The current research on the lateral force resistance of high-rise Mi C is inadequate,and while Mi C has been successfully implemented in medium and low-rise buildings.Its performance in high-rise constructions remains untested,so it is essential to conduct further testing to evaluate its suitability for such structures.The primary focus is on the seismic performance of shear walls constructed by transversely connecting modular elements.Therefore,in order to promote the application of Mi C in high-rise buildings,this paper conducted relevant experimental studies,and the the primary focus and outcomes of this research are outlined below.(1)9 full-size shear wall specimens were designed and tested for seismic performance under various working conditions.One of the specimens was a cast-in-place shear wall,and the remaining eight were manufactured using Mi C technology.The test phenomenon shows that flexure-shear failure occurs in all specimens.The concrete in the compression zone located at the base of the shear wall has been crushed,the protective layer of concrete was falled off,and the rebar of the edge member was pulled off.The Mi C shear wall displayed two-way cracking,with the cast-in-place side exhibited more extensive damage and a higher number of cracks compared to the precast side.(2)Compared and analyzed the seismic performance of Mi C shear walls and cast-in-place shear walls.The performance indexes considered are hysteretic performance,stiffness degradation,bearing capacity degradation,ductility,energy dissipation capacity,and rebar strain.This study examines the impact of truss rebar distance,concrete strength,axial compression ratio,and construction mode on the seismic performance of Mi C shear walls.The test results indicated that increasing the axial compression ratio and enhancing the strength of the cast-in-place concrete can lead to notable enhancements in the bearing capacity and energy consumption capacity of the specimen.However,residual deformation and ductility will be reduced.With the increased of truss rebar distance,the bearing capacity of the specimen is reduced,and the rate of stiffness degradation is accelerated.By adding steel fibers to the concrete,the crack width can be reduced and the concrete’s protective layer can be prevented from detachment.The effectiveness of the connection and force transfer between the precast mold and the cast-in-place concrete layer are reduced as the presence of a plastic plate.The double-wall mold specimens exhibit a higher initial bearing capacity compared to the ordinary specimens,and also experience a faster rate of bearing capacity degradation.(3)The maximum lateral shift angle(θ_u)corresponding to the positive and negative failure points of all specimens was between 1/73 and 1/63,exceeding the limit value specified in the code.It shows that Mi C shear wall has good deformation performance and anti-lateral movement ability,which can meet the engineering application requirements in seismic fortification area.(4)Based on the test results,the finite element numerical simulation and parametric analysis of Mi C shear wall were conducted.The study investigated the effect of different truss rebar heights,rebar ratios of edge members,and prefabricated concrete strength on the wall’s seismic performance.Comparison of the simulation results with the test results verified the correctness of the finite element model.The findings indicated that the error of most test pieces was within 5%.The simulation results aligned with the test results,and the simulation curve matched the test curves closely.The shear wall of modular concrete structure has good aseismic performance,and its deformation performance and lateral displacement resistance have significantly passed the above experimental research and theoretical analysis.The findings can serve as a theoretical and practical reference for future research,as well as the widespread adoption and application of high-rise modular concrete structures in engineering projects.Figure[62]Table[17]Reference[80]... |
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