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首页> 外文期刊>Bulletin of earthquake engineering >Refined dynamic progressive collapse analysis of RC structures
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Refined dynamic progressive collapse analysis of RC structures

机译：RC结构的精制动态逐渐崩溃分析

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Post-earthquake field investigation has revealed that if reinforced concrete (RC) structures in seismic regions were not designed to the level required by modern seismic design codes, they are vulnerable to severe damage or even progressive collapse when subjected to strong earthquakes. To gain insight into the mechanism and prevention of progressive collapse, it is imperative to develop an effective and efficient approach to capture the physical collapse of RC structures by numerical simulation. Finite element method (FEM)-based numerical simulation is one of the most widely used approaches for progressive collapse analysis, but some uncertainties still exist in its element removal algorithms. This paper refines FEM-based dynamic progressive collapse simulation for RC structures by introducing the concept of degree-of-freedom (DOF) release. With the concept, a RC beam-column element removal is a natural consequence of release of all DOFs of the element. This concept is implemented in an open-source finite element code of OpenSees. The test results of a RC beam with two ends fixed under a static load and a RC column with light transverse reinforcement under lateral pseudo-static load are first used to assess and demonstrate the advantages of the DOF release over the beam element removal. The refined progressive analysis method is then applied to a RC frame structure to demonstrate its dynamic progressive collapse with catenary effect included. Finally, a two-span continuous RC bridge with a two-column pier is taken as an example to demonstrate its flexure-shear-axial failure predicted by the proposed method.
机译：地震后田间调查显示，如果地震区的钢筋混凝土（RC）结构没有设计到现代地震设计代码所需的水平，则在受到强烈地震时易受严重的损害甚至逐渐崩溃。要深入了解渐进崩溃的机制和预防，因此必须通过数值模拟开发一种有效和有效的方法来捕获RC结构的物理崩溃。基于有限元方法（FEM）的数值模拟是渐进崩溃分析最广泛使用的方法之一，但其元素去除算法中仍存在一些不确定性。本文通过引入自由度（DOF）释放的概念，改善了RC结构的基于FEM的动态逐渐崩溃模拟。利用该概念，RC光束柱元素去除是释放元件的所有DOF的自然后果。该概念是在开源的开放式有限元代码中实现的。首先使用在静载荷下固定的具有两个端部的RC光束的RC光束以及具有光横向载荷下的光横向加强件的RC柱进行评估，并证明DOF释放在梁元件上的优点。然后将精细的渐进分析方法应用于RC帧结构，以展示其动态逐渐崩溃，包括脉链效应。最后，采用双跨度连续RC桥，以双柱墩作为示例，以展示其通过所提出的方法预测的其挠性剪切轴向故障。

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