施工双悬臂状态双幅高墩刚构桥等效风荷载
首发时间:2013-09-02
摘要:现有的施工双悬臂状态刚构桥等效风荷载计算方法较为复杂,不便于工程应用,本文针对一双幅高墩刚构桥施工双悬臂状态,通过对其脉动风荷载背景响应和共振响应进行简化计算,给出了墩底横桥向弯矩和剪力的阵风响应系数分布规律,以及等效风荷载加载方式,通过与已有理论和国内外相关规范方法的对比分析,表明本文方法的正确性,并具有足够的精度,现有规范在计算双幅高墩刚构桥等效风荷载时由于没有考虑共振响应而导致结果略小。
关键词: 刚构桥 双幅 双悬臂状态 等效风荷载 阵风响应系数
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Equivalent Wind Loads of Twin Decks Rigid Frame High Pier Bridge at the Double-Cantilever Construction Stage
Abstract:Existing equivalent wind load method to calculate the construction state of double cantilever bridge is relatively complex, which is not convenient for engineering application. This paper analyzed the distribution regularities of gust response factor and loading method of the transverse bending moment and shear force of pier-bottom through a simplified calculation of background response and resonant response of fluctuating wind loads, aiming at a twin decks rigid frame high pier bridge at the double-cantilever construction stage. The calculated results were compared with the existing theory value and standard value following the domestic and overseas standards and specifications, which proved that the method is correct and has enough precision in the engineering application and the standard value is a little small because of not considering the resonance response.
Keywords: rigid frame bridge twin decks double-cantilever equivalent wind load gust response factor
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