钢筋混凝土次梁铰接的理论研究及案例分析

THEORETICAL RESEARCH AND CASE ANALYSIS ON HING JOINT OF REINFORCED CONCRETE SECONDARY BEAM

在结构设计中,常常采用次梁作为主梁与楼板之间的连接构件。钢筋混凝土次梁与主梁之间设计为刚接或铰接在工程界存在一定的争论。首先对次梁点铰问题进行了相关理论及观点的梳理总结,并有针对性地提出了设计理念,然后通过工程实例研究了次梁点铰对结构地震响应相关参数的影响。研究表明:次梁铰接使结构总体刚度变小,相较刚接周期一定程度增加,但增幅很小;多遇地震弹性响应表现为位移角增大,基底剪力减小,但相差较小;结构总体用钢量有所增加,小于1. 5%。罕遇地震作用下次梁刚接较铰接结构损伤有一定程度的增加。

The secondary beams are often used as connecting members between main beams and floor slabs in structure design. There are some controversies in engineering about the design of rigid or hinged connection between reinforced concrete secondary beam and main beam. Firstly,the related theories and viewpoints of the secondary beam hinge joint were summarized and the design concept was put forward pertinently. Then,the influence of secondary beam hinge joint on seismic response parameters of structures was studied by engineering examples. The results show:the secondary beam hing joint reduces the overall stiffness of the structure and increases the period to a certain extent,but the increase is very small. The elastic response under frequent earthquakes demonstrate that the drift increases and the shear force decreases,but the difference is small. The total steel consumption of the structure increases to less than 1. 5%. The overall structural damage for rigid joint increases to a certain extent than that of hinge joint under rare earthquakes.