基于风致抖振分析的多跨斜拉桥行人舒适性评价分析

首先,从随机风场模拟方法和抖振风荷载计算两方面介绍了风致抖振分析的基本理论;然后,以南昌市朝阳大桥为工程背景,利用MATLAB自编制程序依据上述随机风场模拟方法建立成桥阶段设计基准风速下标准断面的脉动风速模拟,将抖振惯性力公式计算所得的抖振风荷载施加在主桥模型上,对大桥的行人舒适性作出分析与评价;最后,对南昌市朝阳大桥的人非通道和观景平台提出了行人交通管控措施。

Evaluation and Analysis on Pedestrian Comfort of Multi-span Cable-stayed Bridge Based on Wind-induced Buffeting Analysis

The basic theory of wind-induced buffeting analysis is analyzed from two aspects of random wind field simulation method and buffeting wind load calculation. Taking Nanchang Chaoyang Bridge as the engineering background, using MATLAB self-developed program, according to the above random wind field simulation method, the fluctuating wind speed simulation of the standard section under the design reference wind speed at the completion stage of bridge is established. The buffeting wind load calculated and obtained by the formula of buffeting inertia force is applied to the main bridge model to analyze and evaluate the pedestrian comfort of the bridge. Finally, the pedestrian traffic control measures are proposed for the pedestrian-non-motored passage and viewing platform of Chaoyang Bridge in Nanchang.