Study On Seismic Response Characteristics Of Masonry Structures Based On Changing Foundation Conditions

Based on previous earthquake damage information found that the different geological conditions in the earthquake under the action of building damage,masonry structure is actually one of the most widely used structure form in the villages and towns that previous calculations is the assumption of rigid foundation as a research background to study the damage of structure collapse,ignores the effects of interaction between soil and structure,due to the interaction between soil and structure problems has certain complexity and constraints,in the interaction between soil and structure remains to be further in-depth research.Therefore,this paper analyzes and studies the collapse failure of masonry structures under the interaction between soil and structure by means of investigation and summary,analysis of shaking table model test and application of ABAQUS numerical simulation.The main research contents are as follows:(1)through the analysis and statistics of earthquake damage characteristics of masonry structures under different site soil conditions,it is concluded that the damage degree of masonry structures on hard foundation is far less than that on weak site soil under the action of earthquake;Furthermore,the causes affecting the characteristics of earthquake damage are analyzed and compared.(2)according to the shaking table test of the whole model of soil and structure,it is found that when the seismic wave travels along the soil from bottom to top,the acceleration shows a trend of gradually increasing,which proves that the seismic wave will be amplified when it passes through the soil layer.At the same time,it can be concluded from the spectrum analysis of seismic waves that the low-frequency part of seismic waves will be amplified,while the high-frequency part of seismic waves will be weakened or even be completely absorbed,which indicates that the earth will change the spectral characteristics of seismic waves to some extent.But the strain amplitude of high frequency seismic wave is larger than that of low frequency seismic wave.And under the action of the same seismic intensity,the strain of the model at the pillar is greater than that at other parts,which indicates that the model is prone to failure at the pillar,followed by the failure of the window wall.(3)the numerical calculation models of class Ⅰ and class Ⅱ under two different site conditions were established by using the finite element software,and the results of shaking table model test were checked to analyze the law of acceleration and displacement response of the whole model of soil and structure under the action of earthquake.It is concluded that the types of soil in different sites will affect the peak acceleration of the earthquake,and the seismic performance of the weak soil is weaker than that of the hard soil,the acceleration amplification effect is obvious,and the displacement of the superstructure of the weak soil is larger than that of the hard soil,and the superstructure is prone to failure in the protrusions and column joints.These two places should be used as the key parts of seismic fortification.