异形钢拱塔桥梁温度效应分析

Analysis of Temperature Effect on Bridges with Special-shaped Steel Arch Tower

异形拱塔斜拉桥造型新颖,在提升桥梁美观性的同时也带来了受力复杂的问题。此外,温度效应对异形拱塔斜拉桥的影响也更加突出。为了研究异形钢拱塔斜拉桥在不同温度梯度模式和系统温度变化下的温度应力,以大庆市秀水路跨线桥为例,分别对比了英国、新西兰、美国、中国规范规定的温度梯度作用模型下的结构温度作用,并考虑了系统温度变化下桥梁结构的温度应力。结果表明,中国规范计算的正截面应力较小,这在一些特殊桥梁上可能是偏于不保守的,可以考虑参考其他国家规范进行验算。在梯度温度和系统温度下,主梁的跨中截面和中墩墩顶截面、拱塔的拱顶截面存在局部应力的极大值,在进行设计时可考虑对这些部位进行加强。

The cable-stayed bridge of the special-shaped arch tower is novel,which not only improves the beauty of the bridge,but also brings the problem of complex force.In addition,the effect of temperature effect on the cable-stayed bridge is also more prominent.In order to study the special-shaped steel arch tower cable-stayed bridge in different temperature gradient mode and system temperature change under the temperature stress,taking Xiusui Road bridge in Daqing city as an example,the structure temperature action under the temperature gradient action model specified in the British,the New Zealand,the United States and the Chinese codes was compared respectively.Under the temperature gradient model structure temperature effect,and consider the system temperature change under the bridge structure temperature stress.The results show that the positive section stress of Chinese standard calculation is small,which may be unconservative on some special bridges,which can be considered.Under the gradient temperature and system temperature,the local stress maximum of the span section and the middle pier top section and the arch section of the arch tower,which can be considered in the design.