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首页> 外文会议>Conference on Health Monitoring and Management of Civil Infrastructure Systems Mar 6-8, 2001, Newport Beach, USA >Stochastic Modeling of Ambient Traffic Loadings in LS-DYNA Nonlinear FE Analysis
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Stochastic Modeling of Ambient Traffic Loadings in LS-DYNA Nonlinear FE Analysis

机译：LS-DYNA非线性有限元分析中环境交通负荷的随机建模

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摘要

Bridge dynamics data are usually collected as a function of excitations by ambient traffic loads. However, the stochastic aspects of the multi-lane, continuous traffic flows significantly complicate the loading conditions in dynamics analysis of highway bridges. Such ambient traffic loadings often cause incremental changes of structural shear or bending stresses in bridge structures and therefore result in fatigue damage. Most current approaches for modeling traffic loading rely on simple load spectra approximations and address only the maximum effect of the loading. Therefore, they have limited ability to take into account the effect of such multi-lane ambient traffic flow loadings. This paper presents a stochastic modeling and simulation approach to describe ambient traffic flows over the highway bridges. A Poisson distributed pulse (PDP) process is used to model the stochastic nature of the continuous traffic flows with variable arrival rates and vehicle types. A Monte Carlo simulation algorithms are developed for generating ambient traffic loading input data sets for use in advanced finite element analysis and simulations applied to highway bridge structures. The simulation results, using this stochastic modeling approach in LS-DYNA nonlinear FEM analysis, show significantly improved ability to provide detailed understanding of structural conditions in damage detection and health monitoring of highway bridge structures.
机译：通常根据环境交通负荷的激励来收集桥梁动力学数据。但是，多车道的随机性，连续的交通流量使公路桥梁动力学分析中的载荷条件大大复杂化。这样的环境交通负荷常常导致桥梁结构中结构剪力或弯曲应力的增量变化，因此导致疲劳损伤。当前用于对交通负荷进行建模的大多数方法都依赖于简单的负荷谱近似值，并且仅解决负荷的最大影响。因此，它们具有有限的能力来考虑这种多车道环境交通流量负荷的影响。本文提出了一种随机建模和仿真方法来描述高速公路桥梁上的环境交通流。泊松分布脉冲（PDP）过程用于对具有可变到达率和车辆类型的连续交通流的随机性质进行建模。开发了一种蒙特卡罗模拟算法，用于生成环境交通负荷输入数据集，用于高级有限元分析和应用于公路桥梁结构的模拟。使用LS-DYNA非线性有限元分析中的这种随机建模方法进行的仿真结果显示，能够显着提高对公路桥梁结构的损伤检测和健康监测提供对结构条件的详细了解的能力。

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