摘要
楼板作为水平抗侧力构件,在承受和传递竖向力的同时,把水平力传递和分配给竖向抗侧力构件,协调同一楼层中竖向构件的变形,使建筑物形成一个完整的抗侧力体系。连接两个主体结构的连接板是楼板的薄弱部位,针对薄弱连接板的平面内应力分析及其抗震设计,采用分块刚性力学模型作一些探讨。工程实例表明,时程分析法反映了连接板两端主体结构潜在反相运动产生的平面内应力增大效应。对于连接板的截面设计,推荐采用主拉应力表达式。小震作用下,按裂缝控制等级二级,采用混凝土抗裂强度标准值作为控制连接板混凝土核心层开裂的指标。中震作用下,采用水平钢筋的抗拉强度设计值作为连接板承载能力的指标。
In seismic design of buildings, floors are horizontal elements of the lateral force resisting system, which play an important role in transferring and distribution of the horizontal forces generated by earthquake excitations to vertical elements of the lateral force resisting system. The linking slab, connecting two main structures at its two ends, is the weak place of the floor. A procedure for analysis of in-plan stresses of the linking slab is proposed. It is shown that the potential out-phase motion of the two main structures would cause the stress concentration in vicinity of holes and corners of the slab, which could be observed in the results obtained by time history analysis. It is suggested that the formula for design of reinforced concrete linking slab under the horizontal seismic action would be the expressions in terms of the principal tensile stress.
出处
《建筑结构》
CSCD
北大核心
2008年第3期106-110,37,共6页
Building Structure
关键词
水平抗侧力构件
连接板
平面内应力
中震分析
horizontal elements
lateral force resisting system
linking slab
in-plane stresses
medium strong seismic analysis
