| Masonry structure still has large quantity in rural areas,which tends to crack or even collapse when an earthquake happens.More profoundly,the destruction rate of such structure is high.While earthquake disaster scene shows that the remained masonry structures have excellent seismic performance,especially for the masonry structures with spandrels damage.Compared with other failure modes,this mode has preferable ability of energy dissipation,ductility,destruction but not collapse,easy to repair.Therefore,the spandrels damage failure mode is ideal when an earthquake occurred.However,the current design method in our country only considers the piers damage.On the basic study of failure modes,this paper takes the the spandrel and the connected piers as substructure to carry out the quasi-static test,analyzes the seismic performance under the influence of stiffness ratio between spandrel and piers,and vertical pressure above piers.The main contents are as follows:(1)The boundary of substructure and influence factors are selected through simulated cloud map by picking up multi-direction stress.(2)Establish a model which has same size and load in ABAQUS to predict the cracking load and failure load.Comparing the simulate and experimental results to verify the accuracy of the mode and rationality of experimental boundary conditions.(3)Through the quasi-static test,the failure mode,load bearing capacity,deformability and energy consumption capacity are studied,and the influence of the above factors is analyzed.The test results show that the ABAQUS analysis of masonry structure is feasible;the increase of vertical load above piers is conducive to the formation of a reasonable failure mode;with the decrease of stiffness ratio between spandrel and piers,and increase of span-depth ratio of spandrels,the bearing capacity and energy consumption are improved,the spandrels can take part in energy consumption earlier,and the structure shows a better failure mechanism under earthquake. |
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