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依据“大震不倒”的设防目标,按传统方法设计的钢框架结构,一旦框架梁梁端发生塑性损伤,震后将难以修复。为实现损伤后结构的快速功能恢复,提出了一种采用角钢连接的部件可更换钢梁,地震作用下钢梁的塑性累积损伤集中在连接角钢上,连接角钢与梁段采用高强度螺栓连接,地震损伤后容易更换。为此,试验中设计了3个可更换梁试件,分别对其进行了单调和滞回加载试验。试验结果表明:通过合理设计,该部件可更换梁与原型梁具有相同的弹性抗弯刚度,能控制梁的损伤部位与破坏模式;梁的荷载-位移滞回曲线饱满,耗能能力较好;更换损伤的耗能角钢后,梁可以恢复原有的力学性能。
According to the fortification target of “Great Burst”, the steel frame structure designed according to the traditional method will be difficult to repair once the frame girder end experiences plastic damage. In order to realize the quick functional recovery of the damaged structure, a new type of steel girder with angle steel connection was proposed. The plastic cumulative damage of the steel girder under earthquake was concentrated on the connecting angle steel. The connecting angle steel and the beam section were connected by high strength bolts, Earthquake damage easily replaced. To this end, the design of the test three interchangeable beam specimens, respectively, were monotonic and hysteresis loading test. The test results show that the beam can be replaced by the rational design of the beam with the same elastic bending stiffness, can control the damaged parts of the beam and failure mode; beam load - displacement hysteresis curve full, good energy dissipation; Replacing the damaged energy-consuming angle beam, the beam can restore the original mechanical properties.