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如果使用不可靠的支撑系统,钢结构建筑在地震时易受到损害。地震活跃区域的钢结构建筑应使用同心支撑系统。同心支撑部件的失效多发生在中等长度的塑性铰处。建立一个精细的有限元模型来模拟包括断裂在内的循环荷载下支撑部件的滞回性能。模型所提供的滞回性能与之前的试验和最近两个试验所得到的滞回性能相近。试件所受的荷载模式不同。初始缺陷影响前屈曲和第一次屈曲循环,但对接下来的循环没有影响。方钢管的初始屈服应力越大,局部屈曲发生得越早。发生断裂的中等长度塑性铰的受压角-腹板的外表面累积塑性应变大于内表面。产生的明显局部转动可作为发生断裂构件的塑性应变。
Steel structures are vulnerable to earthquakes if unreliable support systems are used. Steel structures in seismic areas should use concentric support systems. Failure of concentric support components occurs mostly in medium length plastic hinges. A precise finite element model was established to simulate the hysteretic behavior of the support members under cyclic loading, including fracture. The hysteresis provided by the model is similar to the hysteresis obtained in the previous and the last two tests. The specimen is subjected to different load patterns. The initial defect affects the pre-flexion and the first flexion cycle but has no effect on the subsequent cycle. The greater the initial yield stress of square steel pipe, the earlier the local buckling occurs. The fracture angle of medium-length plastic hinges - the cumulative plastic strain on the outer surface of the web is greater than the inner surface. The apparent local rotation that occurs can be used as the plastic strain at which the fracture occurs.