【摘要】 介绍了一个采用钢筋混凝土 (RC)环梁连接的 2层 2跨RC梁 -钢管混凝土 (STCC)柱框架的拟动力试验和静力试验。为了研究环梁在地震作用下的破坏形态 ,大部分节点设计成“弱环梁、强框架梁” ,即环梁屈服先于框架梁 ;少量节点设计成“强环梁、弱框架梁” ,即框架梁屈服先于环梁。试验表明 :小震时 ,框架的刚度降低很少 ;中震时 ,刚度降低约 3 0 % ;大震时 ,层间位移角小于 1 10 0 ;即使弱环梁已经破坏、层间位移角达 1 3 4,框架的承载力仍未下降 ;能够实现“强柱弱梁”和实现塑性铰形成于框架梁端的“强连接、弱构件”的抗震设计概念。RC环梁与STCC柱之间局部范围的缝隙不影响框架的整体抗震性能 ;环梁与柱之间几乎无相对竖向滑移。采用RC环梁连接的RC梁 -STCC柱框架具有良好的抗震性能。更多还原

【Abstract】 Pseudo-dynamic test and static test of a two-story and two-bay frame with reinforced concrete (RC) beams and steel tube confined concrete (STCC) columns are introduced.The RC beam and the STCC column of the test frame was connected with RC ring beam.To understand the failure mode of RC ring beams under earthquake,most of beam-column joints were designed with "weak ring beam-strong frame beam",i.e.,the ring beam yielded first at the joint.A few joints were designed with "strong ring beam-weak frame beam",i.e.,the frame beam yielded first at the joint.The test results showed that under the minor earthquake the stiffness of the frame had little change,under the moderate earthquake the stiffness reduced by about 30%,under the major earthquake the story drift ratio was less than 1/100.Even the weak ring beams had failed and the story drift ratio reached 1/34,the lateral load-carrying capacity of the frame had not dropped.It is obvious that the seismic design concepts of the strong column-weak beam and the strong connector-weak element have been achieved.Some other useful conclusions were obtained through this study.It is concluded that the RC beam-STCC column frame with RC ring beam connectors has excellent seismic behavior.更多还原