Pseudo-static Test And Numerical Analysis Of Fujian Square Tulou

Fujian tulou is the largest active rammed residential building in active service.Rammed earth wall is not only the load-bearing structure but also the maintenance structure.The rammed earth wall forms a bearing force as a whole and shows the different construction and structural features with other rammed earth buildings.As time goes on,however,the damage of rammed earth wall in fujian is becoming more and more serious.The causes of damage include many problems such as wind and rain erosion,capacity reduction,durability,seismic performance and so on.Meanwhile,there are few researches on seismic performance of rammed earth wall structure.Therefore,this paper studies the seismic performance of Fujian square Tulou.In this paper,the prototype of Jiusheng building for different thickness has been used to carry out the pseudo-static test of the scale model of the square Tulou.And the failure pattern,bearing capacity,deformation capacity,stiffness and its degradation curve,hysteresis curve,skeleton curve and energy dissipation are analyzed.In addition,based on the test condition,ABAQUS is used for numerical simulation.The numerical simulation results are compared with the experimental results and the validity of the test is verified.Finally,the bearing capacity of Jiusheng building is calculated.The main research contents are listed as below:(1)Through the field survey of Yongding tulou,the paper selects the representative square tulou "Jiusheng building" as the prototype.The wall thickness is used as the only variable to make three scale specimens and the pseudo-static test is carried out.The experimental materials used their own research and development of C5 concrete instead of rammed earth materias.The C5 concrete is tested for the cube axial compression,and the density,the standard value of compressive strength and the elastic modulus are calculated.The model will be associated with the prototype By calculating the similarity ratio.(2)The crack load,ultimate load and failure mode of the specimens are obtained through the analysis of the pseudo-static test and the failure form.The bearing capacity of the specimens is analyzed by calculating the shear bearing capacity of the specimens.The displacement ductility coefficient of the specimen was calculated to analyze its deformation ability.By means of calculating the average stiffness of the specimens,the stiffness and the curve of the stiffness degradation index are obtained through Origin.The energy dissipation performance is analyzed by fitting the hysteresis curve,skeleton curve,the calculation of hysteresis and equivalent viscous damping coefficient.It is concluded that the bearing capacity,deformation ability and energy dissipation of the structure of the square earth wall with the change of wall thickness.(3)Based on the test condition,the test models by using C5 concrete materials and rammed earth materials are established through ABAQUS software.Low-cycle reciprocating simulation of the model is carried out by using displacement loading method,and the post-processing stress cloud graph,hysteresis curve and skeleton curve are obtained.The accuracy of the numerical simulation is verified by comparison of the bearing capacity,the failure mode and the skeleton curve.(4)The theoretical calculation of shear bearing capacity and seismic bearing capacity of jiusheng building is carried out.