【摘要】 近年来,大跨径钢箱梁桥得到了飞速的发展,同时,在施工中发现温度对它的影响不容忽视.钢箱梁桥在太阳照晒下,箱梁顶部与底部会产生较大的温差,由此而产生的温度应力,会给该桥梁带来初始缺陷,并影响钢箱梁桥的振型变化.自振频率是桥梁结构动力特性的模态参数,也是评价桥梁动力性能的重要依据.以大跨度连续刚箱桥为例,进行建模分析,得出在温度荷载影响下的振型变化情况,对桥梁的设计与施工具有一定的参考价值.更多还原

【Abstract】 In recent years,long-span steel box girder bridge obtained the rapid development,but the influence of temperature in the construction cannot be ignored.Because the top and bottom box can produce a larger temperature difference under the sunshine,arising temperature stress,which would induce the initial defects of bridge so as to affect vibration mode change of steel box girder bridge.Natural frequency of vibration is the dynamic characteristics of the bridge structure modal parameters,which is also the evaluation base of dynamic performance of the bridge.This paper,taking the large span continuous just box bridge as an example,set up an analysis model,specifying the vibration mode change under the temperature influence,which presented a reference to the bridge’s design and construction.更多还原