Abstract

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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

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.