Continuing Research on Stochastic Modeling and Analysis of Long-Span Bridges in Turbulent Winds - Phase II

这项工作将为预测风湍动对大跨度桥梁运动稳定性的影响以及计算运动平稳时桥梁响应的统计特性提供新的方法。将加性风荷载和乘性风荷载建模为随机过程，并利用随机振动的数学方法进行分析。将数值逼近方法应用于处理状态空间中涉及多维的大型桥梁-流体组合系统。利用附加的实验结果，考虑了气动指标函数的改进模型，以包括某些桥梁结构的可能的振荡分量，并评估了此类振荡分量对稳定性和响应计算的影响。这些新方法对新桥的设计和既有桥梁的改造具有一定的参考价值。

This work will produce new methods for predicting the effects of wind turbulence on motion stability of long-span bridges and to calculate the statistical properties of bridge response when motion is stable. Both, the additive and the multiplicative wind loads are modeled as stochastic processes and the mathematical techniques of random vibration are used in the analysis. A numerical approximation procedure is applied to treat a large combined bridge-fluid system, involving many dimensions in the state space. Improved modeling of aerodynamic indicial functions to include possible oscillatory components for some bridge configurations is considered, using additional experimental results, and the effect of such oscillatory components on stability and response calculations is evaluated. These new methods are useful for the design of new bridges and the modification of existing bridges.