梁端铰型受控摇摆式钢筋混凝土框架抗震性能振动台试验研究

Shaking table test on seismic performance of controlled rocking reinforced concrete frame

受控摇摆式钢筋混凝土框架(CR-RCF)采用梁柱铰接节点,后张预应力钢筋提供结构整体恢复力,并采用层间阻尼器耗散地震能量、控制结构整体位移。通过模拟地震振动台对比试验,研究受控摇摆式钢筋混凝土框架的抗震性能。介绍了CR-RCF结构的摇摆机制及摇摆节点的构造形式,设计了受控摇摆式钢筋混凝土框架和常规框架两个振动台试验模型,输入El Centro地震波,得到了不同地震动峰值加速度下结构的动力响应,对比分析了两个模型的振动台试验结果。结果表明:CR-RCF结构较常规框架具有更小的抗侧刚度,故其地震加速度响应更小;CR-RCF结构设置了层间阻尼器耗能装置,地震作用下的结构整体位移得到有效控制;在经历罕遇地震作用后,仅层间阻尼器进入屈服状态,主体框架承重构件保持完好,无任何损伤,表现出优异的'免损伤'特征。

The controlled rocking reinforced concrete frame （CR-RCF） introduces the hinge joints as all the beam- column joints, post-stressed tendons are used to provide the restoring forces of the joints and inter-story dampers are installed to dissipate the earthquake energy and control the displacement response of the structure. The seismic performance of the CR-RCF was comparatively studied by the shaking construction details of rocking joints were introduced and the design of reinforced concrete frame and conventional frame were also outlined, The table test. The rocking mechanism and the two models of the controlled rocking shaking table tests were carried out with exciting the E1 Centro earthquake wave, which was chosen to simulate the ground motion. Finally, the seismic dynamic responses of the two models were analyzed and compared. The test results show that CR-RCF has lower acceleration response due to its lower later-resistance stiffness, the displacement response of the CR-RCF can been controlled effectively by installing the inter-story dampers, and though the damper enters the yielding status, the main body of the CR-RCF keeps damage-free during the major earthquake. The CR-RCF demonstrates an excellent seismic performance.