论文部分内容阅读
临时结构房屋的抗震性能次于永久结构房屋。桩基支撑的塔式起重机是一种临时结构,常被应用于建造高层建筑。安装在高处的塔式起重机,因其是高柔结构,在强地震动的作用下很可能会产生剧烈震荡。桩基结构的地震响应特性受周围的地基和基础类型的影响也较大。在当前日本的设计规范中,地震荷载仅仅被定义为20%的起重机结构重量,都没有充分考虑待结构的动态不稳定性和周围的地基类型。为探究塔式起重机在软粘土桩基中的抗震特性,开展了一系列的离心振动台试验。为起重机吊臂制定了2种不同的荷载条件来准确地模拟实际情况。根据测试结果,对塔式起重机的动力响应行为和影响的因素进行了讨论,得到如下结论:起重机臂架的荷载条件对桩的损伤程度有显著影响,并可以导致塔式起重机不同的破坏模式。
The seismic performance of temporary structure houses is inferior to permanent structure houses. Pile-supported tower cranes are a temporary structure often used in the construction of high-rise buildings. Tower cranes installed at high altitudes are likely to produce violent oscillations under the action of strong earthquakes because of their high-softness. The seismic response of pile foundation structure is also affected by the surrounding foundation and foundation types. In the current Japanese design code, the seismic load is only defined as the weight of the crane structure by 20%. The dynamic instability of the structure to be constructed and the surrounding foundation type are not fully considered. To investigate the seismic behavior of tower cranes in soft clay pile foundations, a series of centrifugal shaker tests were carried out. Two different load conditions were developed for the crane jib to accurately simulate the actual situation. Based on the test results, the dynamic response behavior of the tower crane and its influencing factors are discussed. The conclusion is drawn as follows: The load condition of the crane boom has a significant effect on the damage degree of the pile and can lead to different failure modes of the tower crane.