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首页> 外文期刊>Earthquake Engineering & Structural Dynamics >Application of extended distinct element method with lattice model to collapse analysis of RC bridges
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Application of extended distinct element method with lattice model to collapse analysis of RC bridges

机译：格式扩展离散元法在RC桥梁倒塌分析中的应用。

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摘要

This paper proposes a simple lattice model for collapse analysis of RC bridges subjected to earthquakes by using the extended distinct element method (EDEM). In the model, a concrete element consists of lumped masses connected to one another by springs, and a reinforcement bar is represented by a discrete model or an integrated model. The proposed lattice model is simple but its parameters are reasonably defined. It has fewer element nodes and connecting springs, which will be of benefit by shortening the CPU time. The processes to determine the initial stiffness of concrete and steel springs, the parameters of the constitutive model and the fracture criteria for springs are described. A re-contact spring model is also proposed to simulate the re-contact of the concrete after fracture of springs; and a general grid searching method is used to decrease the CPU time for judging re-contact after fracture. The lattice model is assessed by numerical simulations and experiments. As an application, a damaged single-column pier subjected to the Kobe Earthquake in 1995 is analysed by EDEM with the proposed model. The simulation results indicate that the proposed model predicts well qualitatively the collapse process of RC bridges.
机译：本文提出了一种简单的网格模型，通过扩展离散元方法（EDEM）对地震作用下的钢筋混凝土桥梁进行倒塌分析。在该模型中，混凝土元素由通过弹簧相互连接的集总质量组成，钢筋由离散模型或集成模型表示。提出的晶格模型很简单，但是其参数是合理定义的。它具有较少的元素节点和连接弹簧，这将通过缩短CPU时间而受益。描述了确定混凝土和钢弹簧初始刚度的过程，本构模型的参数以及弹簧的断裂准则。还提出了重新接触弹簧模型，以模拟弹簧断裂后混凝土的重新接触。并采用一般的网格搜索方法来减少判断断裂后重新接触的CPU时间。通过数值模拟和实验评估了晶格模型。作为应用，EDEM用提出的模型分析了1995年遭受神户地震的损坏的单柱墩。仿真结果表明，所提出的模型可以很好地定性预测钢筋混凝土桥梁的倒塌过程。

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