【摘要】 目的研究板厚对板-柱结构抗震性能的影响,为推广板-柱结构在抗震区的应用提供依据.方法采用三维实体建模,对板厚从190~240 mm(跨厚比30~40)的板-柱结构进行了有限元分析.结果得到了板-柱结构的基底剪力-顶点侧移关系曲线及Pushover分析结果曲线,分析了塑性铰出铰情况,并将加载过程分为4个阶段,对比了各加载阶段结构的响应,给出了对应于7度多遇及罕遇地震作用下的结构侧移和层间位移角.结论当板厚从190 mm增大到240 mm时,板-柱结构的抗侧刚度随之增大,板厚每增加10 mm结构的抗侧刚度增大约5%;等代梁刚度随板厚的增加而增大,虽然板-柱结构在形成出铰机制时出现梁铰数量略减而柱铰数量略增的现象,但整体仍以梁铰为主;在7度多遇、罕遇地震作用下,跨厚比在30~40且经过合理设计的板-柱结构的最大层间位移角均能满足抗震规范的要求.更多还原

【Abstract】 The purpose of this paper is to study the influence of slab thickness on seismic behavior of slab-column structures and to provide a basis for extending applications of slab-column structures in seismic regions. Based on the method of 3D solid modeling,finite element analysis was employed for slab-column structures with slab thicknesses ranged from 190 mm to 240mm( span to depth ratios ranged from 30 to 40). Curves of base shear-peak displacements of slab-column structures and Pushover analysis results were obtained and hinges appearance situation of plastic hinges was analyzed. The loading process was divided into four stages; the response of structure in each stage was compared; and the structural lateral displacements and story drift angles under the actions of frequent and rare earthquakes with 7 degrees were given. It is found that with the increase of slab thickness from 190 mm to 240 mm,the lateral stiffness of slab-column structure is increased a-bout 5% per incrcase 10 mm of slab thickness; the stiffness of equivalent beam is also increased.When the hinge appearance mechanism is formed,the number of beam hinges are decreased and the column hinges are increased slightly; while the slab-column structure still dominated by beam hinge mechanism. Under frequent and rare earthquakes with 7 degrees,the all maximum story drift angles of reasonably designed slab-column structures with span to depth ratios ranged from 30 to40 can meet requirements of the seismic code.更多还原