高低塔斜拉桥在温度作用下的静力特性研究

发布时间：2018-01-04 20:33

本文关键词：高低塔斜拉桥在温度作用下的静力特性研究　出处：《世界桥梁》2017年05期 　论文类型：期刊论文

【摘要】：为探讨温度对高低塔斜拉桥结构成桥使用舒适性及安全性的影响,以跨径为(157+280+93.5)m的清溪口渠江特大桥为工程背景,建立有限元分析模型,分别研究了体系温差、日照温差和索梁温差荷载作用对高低塔斜拉桥的主梁应力、主梁竖向位移及斜拉索索力的影响。研究表明:体系温差作用下,低塔侧边跨的主梁翼缘应力和斜拉索索力变化量较高塔侧大,主梁上翼缘的应力小于下翼缘;体系温差和日照温差作用下,高塔边跨的主梁变形较低塔侧大;日照温差作用下,日照升温和降温引起的主梁变形、应力分布及斜拉索索力变化规律相反,且日照升温引起的主梁挠度值、上下翼缘应力值、索力变化量是日照降温的2倍;索梁温差作用下,高塔侧边跨的斜拉索索力、主梁翼缘应力及竖向位移较低塔侧大。在实际工程设计中,应注意关键位置处主梁的应力储备和挠度控制,以及斜拉索的承载能力保有量。
[Abstract]:In order to investigate the effect of temperature on the comfort and safety of the cable-stayed bridge with high and low tower, the Qingxikou Qujiang Bridge with span of 157,280 93.5 m was taken as the engineering background. The finite element analysis model is established to study the stress of the main beam of the cable-stayed bridge with high and low tower under the system temperature difference, sunshine temperature difference and cable beam temperature difference load respectively. The effects of vertical displacement and cable-stayed cable force on the main beam are studied. The results show that the flange stress and cable force of the low side span of the tower are larger than those of the tower, and the stress of the upper flange of the main beam is smaller than that of the lower flange. Under the action of temperature difference of system and sunshine temperature, the deformation of the main beam of the side span of the tower is larger than that of the lower side of the tower. Under the action of sunshine temperature difference, the deformation, stress distribution and cable force change law of main beam caused by sunshine heating and cooling are opposite, and the deflection value of main beam and the stress value of upper and lower flange caused by sunshine temperature rise are opposite. The variation of cable force is twice as much as that of sunshine. Under the action of temperature difference of cable beam, the cable force, flange stress and vertical displacement of the main beam are larger than those of the lower tower side. In the actual engineering design, attention should be paid to the stress reserve and deflection control of the main beam at the key position. And the holding capacity of stay cables.
【作者单位】：西南交通大学土木工程学院;
【基金】：国家自然科学基金项目(51508474)
【分类号】：U441;U448.27
【正文快照】： 1引言双塔斜拉桥相对于其它桥型具有自重轻、受力性能好、跨越能力大等优点,广泛应用于交通建设中[1-2]。由于太阳辐射、气温等环境因素的作用,斜拉桥会产生非线性的温度梯度分布,继而产生不可忽略的温度应力和变形[3-6]。相关学者就温度对斜拉桥结构受力及变形的影响进行了大

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