上承式钢板梁桥水平横向振动研究

作为桥梁横向抗风设计和抗震设计的重要基础,提出了一种计算上承式钢板梁桥水平横向振动固有频率的计算方法.根据贝努利-欧拉梁振动理论,建立了上承式钢板梁桥水平横向振动的振动方程.考虑桥梁连接系的作用,给出了水平横向弯曲刚度的表达式,从而求出了上承式钢板梁桥水平横向振动的固有频率.算例分析表明该方法简便实用,且有良好的近似性.

Study of horizontal transverse vibration on deck type steel plate girder bridge

For purpose of providing a basis for transverse anti-wind and anti-earthquake design of bridge,a calculation method of natural frequency of horizontal transverse vibration on deck type steel plate girder bridge was put forward in detail.First,the horizontal transverse vibration equation on deck type steel plate girder bridge was established with Bernoulli-Euler beam vibration theory.Then the analytical expression of horizontal transverse bending rigidity was given taking the bridge joints system effect into consideration.Finally,the natural frequency of horizontal transverse vibration on deck type steel plate girder bridge was constructed.It is shown by numerical example that this method is simple and practicable,and owns good precision.