大跨连续刚构桥最大悬臂施工阶段风致抖振响应

当大跨连续刚构桥由于基频降至自然界脉动风的卓越频率区时,其风致抖振响应不可忽视。以十堰市将军河汉江大桥为工程背景,首先基于改进的Iwatani线性回归滤波器法,模拟桥址处的脉动风场;之后,采用Davenport准定常抖振力模型,分析该桥最大悬臂施工阶段的风致抖振响应,并与该桥的静阵风响应值进行对比分析;最后,利用抖振分析结果对该桥施工人员的安全性和舒适性进行预评。

Wind-Induced Buffeting Response of Long Span Continuous RigidFrame Bridge at the Longest Cantilever Construction Stage

The wind-induced buffeting response of long span continuous rigid-frame bridge can not be negligible when the basic frequency of the bridge descends to the region of predominant frequency of natural turbulent wind.Taking the Hanjiang Bridge over Jiangjun River in Shiyan City as an example,this paper simulates the stochastic turbulent wind-velocity field of bridge site on the basis of the improved Iwatani-innovated linear regressive filter method,analyzes the wind-induced buffeting response of the bridge at the longest cantilever construction stage by means of the Davenport quasi-steady buffeting force model and compares the response to the static gust wind response values of the bridge site.In the end,the paper also reviews the safety and comfort of construction crew on the bridge according to the analysis results of the buffeting.