Study On Seismic Performance Of HR-EPS Module Composite Thermal Insulation Shear Wall

At present,building energy-saving materials have been developed rapidly in China.Based on the state’s requirements for building structure improvement and building energy conservation,the EPS(Expandable Polystyrene)is processed and used as a template in building to realize the integration of heat preservation and energy-saving.However,there are few studies on the application of this modular system and its seismic performance.Especially the lack of research on seismic performance of EPS modular shear wall,requires enrichment and improvement of its seismic theory through experimental research.In this paper,the seismic performance of HR-EPS modular shear wall specimens is studied.Firstly,the specimens are subjected to Low-cycle cyclic loading test,and then the model of HR-EPS modular shear wall is established by using finite element software ABAQUS to verify the test results and to expand the study of other parameters.The anti-seismic performance of the specimens under low-cycle cyclic loading is comprehensively analyzed.Seismic performance.The main contents are as follows:(1)The full-scale HR-EPS shear wall specimens with different reinforcement ratios were designed and tested under low-cycle repeated loading.The failure modes and causes during loading were analyzed.The seismic performance indexes such as hysteretic characteristics,stiffness degradation,ductility and energy dissipation capacity were obtained by analyzing the relevant data in the experimental process.Influence of reinforcement ratio on seismic performance of specimens;(2)The finite element analysis software ABAQUS is used to establish the model of the modular shear wall.The reliability of the model is confirmed by the simulation of the test results.Then the influence of concrete strength and height-width ratio on the mechanical properties of the specimen is simulated.The seismic performance indexes under various parameters are analyzed comprehensively.The test and finite element analysis show that:(1)The failure modes of all HR-EPS modular shear walls are bending and shearing failure.Due to stress concentration failure at the core ribs,serious cross cracks are formed between the middle and upper ribs of the wall under push-pull load;(2)The hysteretic curves of all HR-EPS shear wall specimens are basically symmetrical with respect to the origin.The hysteretic curves are relatively full and have a large envelope area.The failure delay coefficients of all specimens are greater than 4.0,which have good seismic performance and ductility;(3)With the increase of reinforcement ratio of HR-EPS modular shear wall,the stiffness of specimens increases effectively due to the reinforcement of steel bars,and the rate of stiffness degeneration can be reduced,so that the load-bearing capacity,displacement ductility and energy dissipation capacity of specimens are improved;(4)Increasing the strength of concrete in a certain range can significantly increase the horizontal peak load and peak displacement of the specimens.The specimens have better displacement ductility and energy dissipation capacity,and have better seismic performance;(5)The ductility of HR-EPS modular shear wall is improved with the increase of aspect ratio in a certain range,but its horizontal peak load and peak displacement decrease,and its energy dissipation capacity and seismic performance decrease.