Torsion Analysis of Horizontal Curved Box Girder under Temperature Difference
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摘要: 为了正确计算温差引起的平曲线箱梁的内力和位移,根据平曲线箱梁弯扭耦合的特点,分析了微梁段截面转动和温差引起的扭转变形,并计算了简支平曲线箱梁的扭矩和挠度.将简支平曲线箱梁作为基本结构,导出了连续曲线箱梁内力的计算式,并用于两等跨连续曲线箱梁的计算,与空间有限元分析结果的误差在5%以内,满足工程精度的要求.研究结果表明,计算平曲线箱梁的位移和内力时,应考虑温差引起的扭转变形.Abstract: In order to calculate the internal forces and displacements of horizontal curved box girders under temperature difference correctly,the torsion deformations caused by section rotation and temperature difference were analyzed based on the characteristic of the flexure-torsion coupling,and the torsion and deflection of simply-supported horizontal curved box girders were calculated.By taking a simply-supported horizontal curved box girder as an example of simple structures,a method to calculate internal forces in continuous box girders was put forward.The internal forces in a continuous curved box girder with two equal spans were calculated with this method and compared with the results of 3-D finite element analysis to show an error of less than 5%.The research shows that when the displacement and internal force of horizontal curved box girders are calculated,the torsion deformation caused by temperature difference should be taken in account.
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Key words:
- bridge engineering /
- curved girder /
- nonlinear temperature /
- torsion deformation
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