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介绍了E-Defense振动台试验结果,以研究极罕遇地震下钢结构高层建筑破坏和倒塌行为。根据20世纪八九十年代规范和工程实践的设计数据,试验体为18层钢框架结构的1/3缩尺模型。输入的地面运动是按照同时发生在日本东海、东南海和南海的地震计算出的一种假定的长周期长持时的强烈地震动。对试验体进行了系列级数渐增的地震动,直至其完全倒塌。结构的屈服开始于较低楼层横梁以及1层柱脚。通过增加地震动级数后,裂纹开始出现在焊接及断裂的横梁边缘处,且蔓延到较低楼层。随着楼层间的剪切强度下降,较低楼层的位移增大,最终框架倒塌至支撑框架上。试验结果阐明了高层钢结构的典型破坏过程,得到了考虑由局部失稳和断裂引起的退化的钢构件的滞回特性。
The E-Defense shaker test results are introduced to study the failure and collapse behavior of high-rise buildings with extremely rare earthquakes. According to the design data of 1980’s and 1990’s codes and engineering practice, the test body is 1/3 scale model of 18-story steel frame structure. The input ground motions are intense ground motions at a hypothetical long-period long-term hold calculated from simultaneous earthquakes in the East China Sea, the Southeast Sea and the South China Sea. The test body was subjected to a series of increasing ground motions until it completely collapsed. The yielding of the structure starts with the lower floor beams and the first floor column foot. By increasing the number of earthquakes, cracks begin to appear at the edges of welded and broken beams and spread to lower floors. As the shear strength between the floors decreases, the displacement of the lower floor increases, and the final frame collapses to the support frame. The test results illustrate the typical failure process of the high-rise steel structure and obtain the hysteretic behavior of the steel member considering the degradation caused by local instability and fracture.