大跨度拱桥的等效风荷载

Equivalent Wind Loads of Long span Arch Bridges

摘要:

基于一些大跨度拱桥的工程实例，采用分段评估方法研究了典型拱肋的静力风荷载，采用惯性荷载法分析了抖振和涡振的等效静力风荷载，并对拱肋和主梁分别进行了总风荷载的综合评估.结果表明：分段评估方法用于计算拱肋的静力风荷载是合理实用的；提出的雷诺数效应修正公式有助于预测包含圆截面构件拱肋的原型拱桥的静力风荷载；采取不同的等效风荷载组合形式分析和评估了大跨度拱桥不同构件的风荷载效应.

Abstract:

Based on some engineering practices of long span arch bridges in China, static wind loading of a typical arch rid by using segmental evaluation method and the equivalent static wind loading with respective to the buffeting and vortex induced vibration by using the inertial load method were investigated, as well as the comprehensive evaluation of total wind loading for the arch rib and main deck was conducted. Results show that the segmental evaluation method is reasonable and practical in evaluating static wind loading of arch ribs, and the modified Reynolds Number formulas are benefit to predict static wind loading for prototype bridges including the components of arch rib with circular cross section. Combination forms of different equivalent wind loadings were employed to analyze and evaluate the wind loading effect in different regions of a long span arch bridge.