Finite Element Analysis Of Hysteretic Behavior Of Load-bearing Horizontal-hole Interlock Concrete Hollow Block Walls

Masonry structure is a widely used building system in rural areas of China.In seismic activities,load-bearing masonry is often considered as an important structural component,which may have a significant impact on the overall structure characteristics in terms of stiffness,strength and dissipation capacity.In order to study the hysteretic behavior of such structures,it is necessary to establish a reliable numerical model.Based on the seismic performance test of a series of load-bearing horizontal-hole interlock concrete hollow block masonry with different structural measures,the finite element model suitable for this kind of structure is studied.This paper studies seven specimens with different construction measures,which can be classified into unconstrained wall,wall with structural columns,wall with horizontal reinforced mortar band at the end,wall with openings and wall with increased aspect ratio.Firstly,the seismic performance tests of all the walls are introduced.Several different modeling methods are compared based on the specimens and the aim of numerical simulation,and the most appropriate finite element software is selected.Equivalent diagonal struts model is used to evaluate the response of masonry infilled walls and various parameters required for equivalent struts are studied.In order to select a simple and reliable analysis model to reflect the hysteretic behavior of infilled walls,different parameter formulas and hysteretic models are analyzed in detail,and three kinds of material constitutive relations which can be used to evaluate the seismic capacity of masonry are recommended.Finally,by comparing the simulation results with the experimental results,the following conclusions can be drawn.1.All three materials mentioned can be used to simulate the hysteretic performance of masonry.Pinching 4 material can effectively capture masonry pinching effect and can be used on relatively complex walls.Concrete01 material can achieve a balance between simplicity and accuracy of the model.2.According to the method proposed in this paper,the hysteretic behavior of various masonry structures can be accurately reflected by using the equivalent diagonal struts model.3.The deformation capacity and bearing capacity of masonry are inversely correlated with the area of openings.Increasing the aspect ratio while keeping the height unchanged can raise the deformation capacity of masonry,but at the same time reduce its ultimate bearing capacity.Increasing the axial compression ratio can improve the stiffness and load-bearing capacity of the wall,but it will lead to the decrease of the deformation capacity and energy dissipation capacity.