固结体系斜拉桥一阶纵漂周期及桥塔地震剪力估算公式  

Formulas for Estimating Fundamental Period and Seismic Shear Force at Tower of Cable-stayed Bridges with Fixed Tower-beam Systems

作　　者：何友娣[1] 王巍 沈文爱 HE You-di;WANG wei;SHEN Wen-ai(China Railway Major Bridge Reconnaissance and Design Institute Co Ltd,Wuhan 430056,China;Guangzhou Municipal Engineering Design Research Institute Co Ltd,Guangzhou 510040,China;School of Civil Engineering&Mechanics,Huazhong University of Science and Technology,Wuhan 430074,China)

机构地区：[1]中铁大桥勘测设计院集团有限公司,湖北武汉430056 [2]广州市市政工程设计研究总院有限公司,广东广州510040 [3]华中科技大学土木工程与力学学院,湖北武汉430074

出　　处：《土木工程与管理学报》2019年第6期44-48,55,共6页Journal of Civil Engineering and Management

基　　金：湖北省自然科学基金(2018CFB429)

摘　　要：为在桥梁概念设计阶段快速估算固结体系斜拉桥结构地震响应,基于力学原理推导了结构一阶纵漂周期和桥塔地震剪力的简化公式,该公式建立了结构地震响应与塔梁质量比、塔梁线刚度比两个关键性设计参数的数学关系。算例分析表明:结构一阶纵漂周期和桥塔剪力与有限元分析结果的误差在9%以内,简化公式是有效的实用化方法。最后,通过对公式进行参数分析,得到了不同塔梁质量比、塔梁线刚度比下桥塔地震剪力的变化情况,为今后桥塔的抗震设计提供了一定的指导意义。In order to quickly estimate the seismic responses of cable-stayed bridges during the conceptual design stage, the simplified formulas of the fundamental period of longitudinal vibration and the seismic shear force of bridge tower are derived by the principle of mechanics. The mathematical relationship among the seismic response of bridge, the mass ratio and linear stiffness ratio of tower-beam is established. Numerical results show that the prediction errors of the simplified formulas are less than 9% compared with results of finite element analysis, which demonstrates the effectiveness of the proposed formulas. The variation of seismic shear force of the bridge tower with respect to the mass ratio and linear stiffness ratio of tower-beam is obtained via parametric analysis. The analytical results provide a guiding principle for the seismic design of bridge tower.

关 键 词：斜拉桥 固结体系 地震响应 质量比 线刚度比 估算 

分 类 号：U448.27[建筑科学—桥梁与隧道工程]