Application of mean-force potential lattice element method to modeling complex structures
Application of mean-force potential lattice element method to modeling complex structures
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DOI：
10.1016/j.ijmecsci.2023.108653
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发表时间：
2023-08
影响因子：
7.3
通讯作者：
Shayan Razi;Xuejing Wang;N. Mehreganian;M. Tootkaboni;A. Louhghalam
中科院分区：
文献类型：
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作者：
Shayan Razi;Xuejing Wang;N. Mehreganian;M. Tootkaboni;A. Louhghalam
自然灾害如风暴、地震和洪水会对结构和非结构元件造成损坏和故障，严重影响建筑系统的功能完整性和整体性能。由于此类事件造成的经济损失以及通常曲折的恢复路径，需要重新审视复原力评估的工程方法，通过开发模拟方法，在保真度和效率之间提供平衡，特别是如果要大规模进行事后评估，例如，一个社区的规模在本文中，我们开发了一个离散的模拟框架，一方面过于简单的多自由度模型和复杂的有限元模型之间的中间立场的解决方案，对结构的响应建模。该框架借鉴了格元法（LEM）的平均力势（PMF）方法，其主要思想是将系统离散为一组通过规定的相互作用势相互作用的粒子。这些电位预先在构件尺度上针对不同的结构和非结构部件进行校准。在这里，我们专注于提供的主要元素和必要的步骤，适应建模结构部件在线性政权和离开扩展到非线性政权和损伤的建模为未来的发展。这包括通过晶格模型和连续体理论之间的能量握手，在不同作用（轴向、弯曲、面内和面外作用）下校准不同类型（1D与2D）的结构构件的电势，例如，梁理论和Kirchhoff-Love板理论。我们探索所提出的方法的效用，通过其应用程序模拟一组具有不同程度的复杂性和各种负载条件下的建筑系统。
Natural hazards such as windstorms, earthquakes, and floods cause damage and failure to both structural and non-structural elements, significantly impacting the functional integrity and overall performance of the building systems. The economic loss due to such events and the often tortuous path to recovery call for revisiting engineering approaches to resilience assessment through developing simulation methods that provide a balance between fidelity and efficiency, particularly if the post-event assessment is to be performed at a large scale, e.g., the scale of a community. In this paper, we develop a discrete simulation framework for modeling the response of structures as a middle-ground solution between overly simplistic multi-degree-of-freedom models on the one hand and intricate FE models on the other. The framework draws upon the Potential-of-Mean-Force (PMF) approach to Lattice Element Method (LEM) where the main idea is to discretize the system into a set of particles that interact with each other through prescribed interaction potentials. These potentials are calibrated beforehand at member scale, for different structural and non-structural components. Here we focus on providing the main elements and the steps necessary for adaptation to modeling structural components in linear regime and leave the extension to nonlinear regime and the modeling of damage for future developments. This includes calibration of the potentials for structural members of different types (1D vs. 2D) under different actions (axial, bending, in-plane and out-of-plane actions) through an energetic handshake between the lattice model and continuum theories, e.g., the Timoshenko beam theory and Kirchhoff–Love plate theory. We explore the utility of the proposed method through its application to simulation of a set of building systems with different levels of complexity and under various loading conditions.