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首页> 外文期刊>Journal of aerospace engineering >Stress Analysis of a Long-Span Steel-Truss Suspension Bridge under Combined Action of Random Traffic and Wind Loads
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Stress Analysis of a Long-Span Steel-Truss Suspension Bridge under Combined Action of Random Traffic and Wind Loads

机译：随机交通与风荷载共同作用下大跨度钢桁架悬索桥受力分析

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This paper presents an efficient approach for dynamic stress analysis of a long-span bridge under the combined action of stochastic traffic and wind loads based on the stress influence function, which converts the stress finite-element analysis problem into a problem of stress integral or summation. The Aizhai Bridge in China is used as an example to demonstrate the numerical procedure for the stress analysis. First, the finite-element model for the Aizhai Bridge is established, and the critical locations of the bridge are determined by refined analyses. By using influence line analysis, the stress influence functions to calculate the dynamic stress response of the bridge under random traffic and wind loads are obtained through segmented polynomial fitting. Second, the random traffic flow simulation program is compiled by adopting the Monte Carlo-simulation method. The moving equivalent dynamic vehicle loading, representing different types of running vehicles on the bridge, is calculated based on the full interaction analyses of a single-vehicle-bridge-wind system, and the database of the equivalent vehicle load is established. Finally, the stress induced by the combined action of the random traffic and wind loads is obtained by summing the product of the stress influence surface function and equivalent vehicle loads and by integrating the product of the stress influence line functions and wind loads where the dynamic effect is considered by introducing the dynamic influence coefficient. The proposed method is validated by comparing the results with those from analysis with commercial software, and it is found that that the proposed method is feasible and efficient. (C) 2018 American Society of Civil Engineers.
机译：本文提出了一种基于应力影响函数的大跨度桥梁在随机交通和风荷载共同作用下的动态应力分析的有效方法，将应力有限元分析问题转换为应力积分或求和问题。 。以中国的爱寨桥为例，说明了应力分析的数值过程。首先，建立了艾寨桥的有限元模型，并通过精细分析确定了桥梁的关键位置。通过影响线分析，通过分段多项式拟合得到应力影响函数，用于计算桥梁在随机交通和风荷载下的动态应力响应。其次，采用蒙特卡罗仿真方法，编制了随机交通流仿真程序。基于单车桥风系统的完整相互作用分析，计算了代表桥梁上不同类型行驶车辆的运动等效动态车辆载荷，并建立了等效车辆载荷数据库。最后，通过将应力影响面函数与等效车辆载荷的乘积相加，并将应力影响线函数与风荷载的乘积相乘，可以得出由随机交通和风荷载的联合作用所引起的应力。通过引入动态影响系数来考虑。通过将结果与商业软件分析的结果进行比较，验证了该方法的可行性和有效性。 （C）2018美国土木工程师学会。

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