Study on the seismic collapse resistance of RC frame structure considering infill wall plane stiffness distribution
In order to study the influence of infill walls on the seismic performance of RC frame structure,the Teaching Building A of Xuankou Middle School which collapsed in the Wenchuan earthquake was taken as the prototype and a finite element model based on ABAQUS software was constructed for the shear analysis of each column at the ground floor.It was found that the arrangement of the infill walls made the structural plane stiffness unevenly distributed,resulting in the uneven distribution of seismic shear forces among the bays of frames.In order to quantitatively examine the influence of the stiffness distribution of each axis of the plane on the seismic performance of the structure,four structural models with different stiffness distribution of infill wall frames along each bay of the axis were de-signed,and the seismic collapse resistance of the four models were evaluated through IDA a-nalysis.The results show that the structural model with uniformly distributed plane stiff-ness has the lowest collapse probability and good seismic toughness;when the stiffness of an axis is higher than 30%of the average stiffness of each axis of the plane,the collapse proba-bility of the structure increases significantly and the collapse safety reserve is insufficient.It is recommended that the stiffness of each axis of the plane should not exceed the limit of 30%in the design.
NETL
NSTL
万方数据
维普
