论文部分内容阅读
以某高铁站房框架结构底部两层为研究对象,完成一榀缩尺比为1∶5的两层两跨高强轻骨料混凝土框架整体模型低周反复荷载试验,研究了框架受力过程、破坏机制与破坏形态、位移延性、滞回耗能特性以及刚度退化等。结果表明:按照JGJ 12—2006《轻骨料混凝土结构技术规程》设计的试验框架能够满足“强柱弱梁、强节点弱构件”的设计要求;破坏机制属混合破坏机制,即塑性铰首先在模型首层梁端出现,在首层梁端出现塑性铰后柱端出现塑性铰,试件以柱根部混凝土压溃、柱内纵筋压曲外露为破坏标志,节点核心区箍筋在试件受力全过程中一直处于弹性工作状态。框架整体及层间的滞回曲线均较为饱满,高强轻骨料混凝土框架具有较好的耗能能力。
Taking the two floors of the bottom of a high-speed railway station as the research object, a low-cycle cyclic loading test of a two-span and two-span high-strength lightweight aggregate concrete frame with 1 × 5 scale was completed. The mechanical behavior of the frame, Failure mechanism and damage morphology, displacement ductility, hysteresis energy consumption characteristics and stiffness degradation. The results show that the test frame designed according to JGJ 12-2006 “Technical Specifications of Lightweight Aggregate Concrete Structure” can meet the design requirements of “strong column and weak beam, strong node and weak member”. The failure mechanism is a hybrid failure mechanism, that is, the plastic hinge First appeared in the first layer of the beam beam end, plastic hinge appears in the first layer of the beam after the plastic hinge at the column end, the specimen to the root column of concrete crushing column buckling longitudinal buckling exposed as a sign of failure, node core stirrup in The whole process of the specimen has been in a flexible working condition. The hysteresis curves of the whole frame and the interlayer are all full, and the high-strength lightweight aggregate concrete frame has better energy dissipation capacity.