低周反复循环荷载作用下装配整体式钢骨混凝土框架节点抗震性能试验研究

通过对2组、每组2个足尺寸节点试件进行的低周反复循环荷载试验,研究了装配整体式钢骨混凝土框架节点的抗震性能;其中第一组试件为按"弱节点"设计的中节点,第二组试件为按"强节点"设计的边节点,且对第二组的1个试件的节点核心区附近框架梁H型钢的上、下翼缘采取狗骨式削弱的构造措施.试验结果表明:在相同轴压比的条件下,2组试件均有较好的延性,且第二组试件的耗能能力明显高于第一组试件;对节点核心区附近框架梁H型钢翼缘采取狗骨式削弱,能够将框架梁的塑性铰从梁端根部转移到削弱部位,从而有效地提高节点的抗震性能.节点核心部分和梁拼接部位的型钢腹板采用高强螺栓连接、钢筋采用套管连接的构造方式是安全的.

Seismic behavior of joints of prefabricated steel reinforced concrete integral frame under low cyclic and reciprocal loading

The seismic behavior of joints of the prefabricated steel reinforced concrete integral frame was investigated under low cyclic and reciprocal loading.The specimens were divided into two groups with 2 full-sized specimens in each.The specimens in first group were the interior joints designed as weak connection,and the specimens in second group were the exterior joints designed as strong connection.A specimen of second group was constructed with dog-bone style weakening on the upper and lower flanges of the H-type steel at the beam end near the joint core.The test results showed that under same axial compression ratio,all the specimens presented good ductility,which the capacity of energy dissipation of the second group specimens were clearly higher than that of the first group specimens.When the dog-bone style weakening was taken on the flange of the H-type steel at the beam end near the joint core,the plastic hinge of the beam was transferred from the root of beam end to the weakened position,thus the seismic behavior of the joints could be improved effectively.It was safe to adopt high-strength bolt connection for sectional webs and muff couplings for concrete reinforcement bars at the position of splice between the joint cores and beams.