3·11大地震中大空间结构破坏主因及加固对策
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摘要
通过对日本3·11大地震的震后现场调查,发现既有大跨空间结构梁柱连接节点的设计假定与真实情况不符。本次地震造成了这类建筑钢屋架与混凝土柱的连接部位普遍存在不同程度的损坏,在同类建筑中,作为灾民临时避难安置场所的500余座体育馆建筑,存在极大的安全隐患。为了探究这类损伤的原因,建立了某一体育馆的结构整体模型和连接部位的精细化弹塑性模型,并有针对性地提出了在连接处安装橡胶垫的加固方法,通过数值模拟计算和现场实测证明这是一种有效易行的节点连接加固方法。
According to the survey for the Great East Japan Earthquake,the traditional calculation assumption of the beam column connection of large span structures was found that it cannot reflect real situation properly.During the earthquake,around 500 stadium buildings served as temporary refuges in Tohoku area got damage,especially the connections between the steel roofs and the RC columns,which indicated the potential risks in similar buildings. For further investigation of the failure mechanism,the global structure model and local elastoplasticity model for the connection are set up. A retrofit method by using rubber blanket as bearing supporters in the connections is presented and investigated. The numerical simulation and site test results show the validity of the proposed method.
引文
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