高原高寒地区钢-混凝土组合梁斜拉桥温度效应分析-《建筑科学与工程学报》

文章信息/Info

Title:: Temperature Effect Analysis of Steel-concrete Composite Girder Cable-stayed Bridge in Arctic-alpine Region

Author(s):: JI De-jun, LIU Jiang, ZHANG Zhuan-fang, LIU Yong-jian; Qinghai Provincial Authority of High-grade Highway Construction Management

Keywords:: concrete-steel composite cablestayed bridge; arctic-alpine region; temperature effect; vertical temperature gradient; sensitivity

摘要:: 对比了当前各国规范对钢-混凝土组合梁竖向温度梯度形式及温度基数取值的相关规定，其中英国规范和欧洲规范最为详尽合理。在英国规范的基础上，通过桥位处太阳辐射强度的计算结果对温度基数的取值进行修正。以青海黄南地区哇加滩黄河特大桥为背景，建立全桥有限元杆系模型，对比分析了修正的英国规范温度梯度模式和中国规范的温度梯度模式作用下主梁的应力分布，以及斜拉桥在整体温差、索梁（塔）温差、主梁竖向温度梯度和主塔顺桥向温差作用下的温度效应及各构件的温度敏感性。结果表明：在青海高原高寒地区，进行桥梁设计时采用考虑地理位置修正的英国规范主梁竖向温度梯度模式进行计算并指导设计更偏于安全；对于主桥的某些构件，温度作用已经成为仅次于恒载的第二大控制作用，所得出的全桥各构件温度敏感性分析结果可为高原高寒地区同类桥梁的设计、计算提供参考和依据。

Abstract:: Authors compared vertical temperature gradient and its basis in composite girder of current codes of different countries, in which British standard and Eurocode were the most detailed. Based on British standard, temperature basis was revised by calculating the solar radiation of bridge position. With engineering background of Wajiatan Yellow River Bridge in Huangnan, Qinghai, the finite element model of a whole bridge was established to calculate the stress of the girder at vertical temperature gradient of revised British code and Chinese code. Meanwhile, the temperature effects and sensitivity of each structural member under different temperature loads of entire temperature difference, cablegirder (pylon) temperature difference, vertical temperature gradient of girder and alongspan temperature gradient of pylon were analyzed. The results show that in Qinghai arcticalpine region, design of composite girder cable-stayed bridge with vertical temperature curve of Chinese code is insecure; for some structural members, temperature effect plays the most important role except the dead load. The obtained sensitivity analysis results of different structural members in a whole bridge can provide references for the design and calculation of similar bridges.