Numerical Simulation Analysis And Experimental Study On Seismic Behavior Of Cavity Wall Masonry

As a special masonry structure, cavity wall masonry is well accepted in rural areas of our country due to its low cost. However, it is not covered by the current code in our country and there are few studies on its mechanical performance. Therefore it is being the research for many experts to study the mechanical properties of cavity wall masonry in this case.On the basis of previous studies, the article uses the numerical simulation analysis on the empty bucket of masonry wall by ANSYS, which is combined with pseudo-static test of the wall to know about its associated mechanical properties. Summarizes of theoretical analysis and experimental study are as follows:Finite element analysis(FEA) on the compressive strength of empty bucket masonry is used at first. Results comparison of the solid masonry between the finite element numerical simulation and calculation according to standard show the accuracy of the FEA method. Then we emphasis on the FEA of compressive strength of the empty bucket masonry, including impact of different rates and different ways under the same empty bucket rate. The results indicate that bearing capacity of the empty bucket masonry are greatly reduced compared to solid masonry. Compressive strength of the empty bucket masonry is gradually decreased with the increasing rate. The failure mode of empty bucket masonry is different from solid masonry, which is the main reason for the lower of its carrying capacity.Followed is finite element simulation of the cavity wall's anti-side force behavior under pressure. According to the wall testing process, we put finite element numerical simulation on the cavity wall which is set the ring beam but without structural concrete column, using discrete model to analysis the principal stress, cracks distribution and displacement of the wall. Numerical simulation results show that the failure mode of the cavity wall is the same as solid wall's, which is the main tensile stress-controlled shear-type failure, showing a strong brittle.Finally, different tectonic cavity walls' pseudo-static test is explored to analysis their anti-side force behavior and learn the failure morphology, cracking load, ultimate bearing and deformation capacity under the pressure. The results note that structural measures can increase the ductility of the cavity wall greatly.Comparative analysis of pseudo-static test and finite element simulation indicates that the non-linear FEA based on ANSYS may obtain pretty good simulation results, including stiffness degradation, distribution and expansion of cracks and displacement for the cavity wall, which can provide some references for the study of seismic performance of existing cavity wall buildings.