Research on Shear Lag Effect of Large-span Steel-concrete Composite Beams Under Temperature Action
Taking the new Dengkou Yellow River Bridge in BYZQ-7 section of Baotou-Huinong section of Baotou-Yinchuan High-speed Railway as the research object,considering the influence of temperature change on the shear lag of steel-concrete composite beams,the temperature stress is solved,and the temperature shear lag coefficient is established.The temperature sensor is used to monitor the all-weather temperature,and the field measurement method is used to study the temperature field distribution law of the steel-concrete composite beam,and the shear lag effect time history curve of the steel-concrete composite beam under the action of temperature is calculated and analyzed.The results show that the temperature change of the steel-concrete composite beam is consistent with the temperature rise and fall process of the ambient air,and the temperature field distribution is uneven.The temperature mutation has a significant effect on the shear coefficient of the steel-concrete composite beam.The peak value of the shear lag coefficient at the junction of the top plate and the web is 1.63 times that of the shear lag coefficient at the junction of the bottom plate and the web.
bridgestemperature effectsteel-concrete composite beamsshear lag effectconstruction
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