摘要
在自然风的作用下桥梁主梁所受到的风荷载一般可分为平均风荷载、背景脉动荷载和抖振惯性荷载三部分来描述 ,其中抖振惯性荷载可由桥梁抖振加速度得到 .根据Scanlan的颤抖振理论并引入气动导纳的影响 ,导出了大跨桥梁侧向抖振加速度的简化计算公式 ,并给出了桥梁抖振惯性荷载的计算公式 .对抖振加速度和抖振惯性荷载进行了参数分析 ,最后给出了数值算例 .分析结果表明 :给出的简化计算公式具有较好的精度 ,可适用于设计初步阶段对桥梁的抖振加速度和风荷载的估算 .
Total wind load on the deck of a bridge can be divided into three parts:mean wind load,background fluctuation wind load and inertia wind load.Wind induced acceleration of bridges can be used to calculate the inertial wind load.A new simple formula for calculating the wind induced lateral acceleration of bridges is introduced in the present paper,which is based on the general scheme of Scanlan's formulation, taking the aerodynamic admittance into consideration.A simple formula based on D'Alembert's Principle for computing wind induced inertia wind load of bridges is also developed herein.Parametric analyses are carried out to show the characteristic of wind induced acceleration and inertia wind load.The numerical examples at the end of the present paper illustrate the simplicity of application and the precision of the results involved by this method,highlighting its predisposition to rapid manual engineering calculations and standards applications.
出处
《同济大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2001年第1期30-34,共5页
Journal of Tongji University:Natural Science
基金
国家自然科学基金资助项目! (5 9895 410 )
