Numerical Simulation Analysis Of Dynamic Behavior Of Masonry Load-bearing Walls Under Blast Loads

Masonry structure is often used in civil buildings.Since the founding of the People's Republic of China,a large number of masonry structures have been built to meet the use needs.The integrity of masonry wall is poor,and the ability to resist accidental explosion load is low.Once an explosion accident occurs,it will pose a serious threat to the life and property safety of building users.The load-bearing masonry wall bears the upper floor load,and its stress state is more complex under the action of explosion load.At present,there is less research on the dynamic behavior of the load-bearing wall under the action of explosion load,which limits the design idea of the masonry structure when considering the explosion load.Therefore,it is necessary to analyze the dynamic behavior of the load-bearing masonry wall under the action of explosion load.In this paper,LS-DYNA finite element software is used to analyze the dynamic behavior of different types of masonry bearing walls under explosion load.The research results can provide reference for the anti-explosion design of masonry structures.This study introduces the masonry wall model and finite element analysis method required for analysis.The numerical simulation analysis of the gas explosion test of masonry wall is carried out by using the established finite element calculation and analysis model of masonry wall,which verifies the accuracy of the finite element calculation and analysis model and the applicability of the model to the analysis of gas explosion.For the unreinforced masonry bearing wall,the load displacement curve of the wall is obtained by using the displacement loading method,the vertical ultimate load of the wall is determined,and the wall is loaded vertically according to the load ratio,and the P-I diagram of the wall under different load ratio,different height thickness ratio,different material strength,different explosion load shape and different explosion load types is obtained.The effects of load ratio,height thickness ratio,material strength,explosion load shape and explosion load type on the explosion resistance of the wall are analyzed.For the composite masonry load-bearing wall,the load displacement curve of the wall is obtained by using the displacement loading method,the vertical ultimate load of the wall is determined,and the wall is loaded vertically according to the load ratio,and the P-I diagram of the wall under different load ratio and different height thickness ratio is obtained.The effects of load ratio and height thickness ratio on the explosion resistance of walls are analyzed,and the differences of explosion resistance between unreinforced masonry walls and composite masonry walls are compared.