Research On Seismic Behavior Of EPS Module Shear Wall

As a new insulating weight-bearing structural system, EPS module (polystyreneinsulating board) is overlapped like roy brick to form a hollow wall, then bind thesteel and grout according the specific project design, after the concrete setted andtightly fitted with the dovetail groove on the inner surface of the module, finallyformed the integrate wall of insulating and weight-bearing. This kind of shear wallhas the advantages of insulating, without demoulding, light and facilitated theconstruction, etc. which has broad prospect in residential building in future. Since theEPS module structural system was the latecomers in China, research on its seismicbehavior was not that adequately, it needs abundant experiments to research.There are many factors that influence the seismic behavior of the shear wall, likeaxial compression ratio, height to width ratio, concrete grade of strength and steelratio in edge of the shear wall, etc. in this paper the influence of height to width ratioon seismic behavior of shear wall. Based on the experiment created the shear wallconcrete elements with SOLID65with ANSYS, simulated the working condition ofthe EPS module shear wall under low frequency cycle load. Simultaneously since thelightweight aggregate concrete has advantages of low cost, light, insulating, etc. italso reserves abundantly in China, so in this paper lightweight aggregate concretewith pumice and volcanic residue were made, and measured its compressive strengthto check whether it satisfies the requirement for use. The work we did and the mainconclusion in this paper are as follows:(1) Designed four shear walls with height to width ratio of1.5and2. Bypseudo-static experiment, recorded the crack and failure process of shear walls, thecrack load, yield load, ultimate load and the development of crack, also plotted thehysteresis curve, skeleton curve, rigidity degeneration curve and got the ductilitycoefficient of the shear walls, finally compared the seismic behavior of shear wallswith different height to width ratio. The results showed that shear walls with largeheight to width ratio had full hysteresis curve and good energy dissipation capacity, their rigidity degenerated slowly and after the shear walls yielded the walls showedwell ductility.(2) Finite element analysis software ANSYS was adopted to simulate the seismicbehavior of the EPS module shear wall, according to the simulation results it showedthat there was only about10%deviation between simulation result and the experimentresult, it indicated that the ANSYS software has high reliability, and it could be usedfor further simulation of the seismic behavior of shear wall.(3) Applied pumice and volcanic residue from Changbai Mountain region to mixlightweight aggregate concrete, and made6EPS module shear walls with that.According to the compressive experiment, the average compressive bearing capacityof lightweight aggregate concrete EPS module shear wall was4.2MPa, it was largerthan common sintered brick’s and also larger than sintered porous brick whose designvalue of compressive bearing capacity was3.94MPa. It proved that the EPS shearwall made by CL15lightweight aggregate concrete with pumice and volcanic residuefrom Changbai Mountain can satisfy the demand on bearing capacity of masonry, andhad a good prospect of application and popularize.The research results in this paper can support experimental data for aseismaticdesign of EPS module shear wall, also can be reference for engineering design andapplication.