地震作用下钢筋混凝土框架结构倒塌全过程振动台试验研究
发布时间：2018-11-19 16:47
【摘要】：以玉树7.1级地震中某底层遭到严重破坏的钢筋混凝土(RC)框架结构为原型,设计了1个1∶5缩尺的三维模型,通过模型的倒塌全过程振动台试验,研究了汶川、玉树地震中高烈度地区RC框架结构出现的典型侧向逐层呈多米诺骨牌式连续倒塌现象的全过程和倒塌破坏机制。试验中该模型结构的倒塌过程共分为两个阶段,即侧向增量倒塌和竖向连续倒塌。当底层层间位移角达到1/19时,试验模型处于临近倒塌状态。在倒塌过程中,底层角柱C3最先丧失竖向承载力,此时竖向倒塌开始发展,结构在重力荷载及输入地震动的共同作用下,底层柱的水平侧移持续增加,造成其相邻的柱B2、B3、C2相继失效,丧失竖向承载力,模型结构的冗余度不足使结构产生更大范围的竖向倒塌,最终模型结构呈侧向逐层连续倒塌。通过对倒塌后废墟的研究,发现模型结构呈"强梁弱柱"型破坏,其破坏模式与震害调查结果一致。最后,讨论了此种废墟下人员生存空间的问题,给出了防RC框架结构倒塌的相关建议。
[Abstract]:Based on the reinforced concrete (RC) frame structure which was severely damaged at the bottom of the Yushu earthquake with M = 7.1 as the prototype, a three dimensional model with a 1:5 scale was designed. The shaking table test of the whole process of the collapse of the model was carried out to study Wenchuan. The whole process and the collapse failure mechanism of the typical lateral collapse of RC frame structure in the high intensity and high intensity area of Yushu were characterized by domino continuous collapse. The collapse process of the model is divided into two stages: lateral incremental collapse and vertical continuous collapse. When the interstory displacement angle reaches 1 / 19, the experimental model is near collapse. In the process of collapse, the bottom corner column C3 loses the vertical bearing capacity first, and the vertical collapse begins to develop. The horizontal displacement of the bottom column increases continuously under the combined action of gravity load and input ground motion, resulting in the adjacent column B2B3. C _ 2 failure, loss of vertical bearing capacity, lack of redundancy of the model structure caused a larger scale of vertical collapse of the structure, and finally the model structure continuously collapsed layer by layer. Through the study of the ruins after the collapse, it is found that the model structure is of "strong beam and weak column" failure, and its failure mode is consistent with the results of earthquake damage investigation. Finally, the problem of the living space under the ruins is discussed, and the relevant suggestions to prevent the collapse of the RC frame structure are given.
【作者单位】： 中国地震局工程力学研究所;中国地震局地震工程与工程振动重点实验室;
【基金】：中国地震局工程力学研究所基本科研业务费专项(2016B04,2016A05) 国家自然科学基金青年基金项目(51408563)
【分类号】：TU375.4
[Abstract]:Based on the reinforced concrete (RC) frame structure which was severely damaged at the bottom of the Yushu earthquake with M = 7.1 as the prototype, a three dimensional model with a 1:5 scale was designed. The shaking table test of the whole process of the collapse of the model was carried out to study Wenchuan. The whole process and the collapse failure mechanism of the typical lateral collapse of RC frame structure in the high intensity and high intensity area of Yushu were characterized by domino continuous collapse. The collapse process of the model is divided into two stages: lateral incremental collapse and vertical continuous collapse. When the interstory displacement angle reaches 1 / 19, the experimental model is near collapse. In the process of collapse, the bottom corner column C3 loses the vertical bearing capacity first, and the vertical collapse begins to develop. The horizontal displacement of the bottom column increases continuously under the combined action of gravity load and input ground motion, resulting in the adjacent column B2B3. C _ 2 failure, loss of vertical bearing capacity, lack of redundancy of the model structure caused a larger scale of vertical collapse of the structure, and finally the model structure continuously collapsed layer by layer. Through the study of the ruins after the collapse, it is found that the model structure is of "strong beam and weak column" failure, and its failure mode is consistent with the results of earthquake damage investigation. Finally, the problem of the living space under the ruins is discussed, and the relevant suggestions to prevent the collapse of the RC frame structure are given.
【作者单位】： 中国地震局工程力学研究所;中国地震局地震工程与工程振动重点实验室;
【基金】：中国地震局工程力学研究所基本科研业务费专项(2016B04,2016A05) 国家自然科学基金青年基金项目(51408563)
【分类号】：TU375.4
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