建筑结构平面形状对结构抗倒塌能力的影响

hinese codes set specific limits on the regularity of buildings' planar shape. In engineering practice, to meet the requirements on regularity, we usually set seismic joint to divide the building into several regular parts. However, the actual earthquake damages showed that structures on the sides of the joint would collide with each other, which mostly caused the buildings to be damaged seriously and even to collapse. Currently, the engineers have different opinions on the necessity of setting seismic joint. This thesis designed two groups of reinforced concrete frame structures, whose planar shapes individually were rectangular, L-shaped, and the planar shape's parameters of the frame structures were length-width ratio of rectangular planar shapes, projection ratio (the protruding length to the total length in the projection direction) of L-shaped planar shapes. This thesis built their 3D finite element models by OpenSees, adopted the incremental dynamic analysis method to calculate those frames' IDA curves and CMR, which is the collapse margin ratio of the buildings, according to the FMMA P965, and analyzed those planar parameters' impact on the structures' probability of collapse. The results from this thesis can provide evidence of the necessity of setting seismic joint from this view of the structures' collapse resistance.