| Coupled shear walls play an important role in the combined system of high-rise buildings,and as a key component in coupled shear walls,the seismic performance of coupling beams is a very important role in the structure.The existing coupled shear walls are still characterised by low load carrying capacity,poor ductility and difficult construction.Therefore,this paper proposes and designs a closed double compression steel plate concrete composite coupling(CSPC)beam,in which a closed double profiled steel plate is placed in the reinforcement skeleton of the beam.The seismic performance of this new beam and its seismic effect in coupled shear walls are investigated.The main findings of the study are as follows.(1)The finite element software ABAQUS is applied to analyze the existing steel plate concrete composite coupling beam,and the results of simulation and experiments are compared to verify the effectiveness of the modeling method.(2)The finite element models of three types of pressed steel and concrete composite beams and two types of flat steel and concrete composite beams are proposed and designed.The five types of beams are then compared and analysed in terms of damage and damage process,load carrying capacity,ductility and energy dissipation capacity.The results of the study show that the profiled steel plate can effectively improve the load carrying capacity of the beams compared to the flat steel plate,while the improvement of the ductility performance of the beams is related to the form of plate mating.The ductility of the structure can be effectively improved by the double plate form compared to the single plate.The seismic performance of this new closed double profiled steel plate concrete composite coupling beam is better.(3)A finite element model of 12 closed double profiled steel plate concrete composite(CSPC)beams was designed.This includes the study of the effects of five factors on the seismic performance of CSPC beams,namely span height ratio,slab ratio,number of closed-cell double-compacted steel plate ribs,hoop ratio and staggered steel plate length.The results of the study demonstrate that the span-to-height ratio,plate ratio and the number of closed-end compression steel ribs have significant effects on the structural load bearing capacity and ductility performance.The span height ratio,plate ratio and the number of closed-end profiled steel plate ribs have a significant effect on the structural load carrying capacity and ductility performance,while the hoop rate and misalignment length of profiled steel plate have a smaller effect on the structural load carrying capacity but a greater effect on the ductility.A reasonable range of values for each top parameter is given in the paper,which can provide a reference basis for the design of this type of continuous beam.(4)Numerical simulations of existing symmetrical double-limb short-limb shear walls were carried out using the finite element software ABAQUS.This included a comparative analysis of the simulation results with the experimental results to verify the reliability of the overall structural modelling approach.(5)The new CSPC beam-coupled shear walls model was established using the finite element software ABAQUS in conjunction with the actual project.This includes an analysis of the structural damage destruction process.The effect of single wall limb height to width ratio,coupled beam span to height ratio and total building height on the seismic performance of CSPC coupled beam-coupled shear walls was investigated.The study indicates that CSPC coupled beam-coupled shear walls have high bearing capacity and ductility,and it is recommended that the span-height ratio of coupled beams be controlled at 1.5-2.0.In the design of the wall limb height to width ratio,the single-sided height to width ratio of the wall limbs should be reduced according to the actual situation in each region to improve the overall seismic performance of the building structure.. |
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