摘要
为揭示单箱单室薄壁箱梁横向弯矩计算过程中虚设的侧向水平支承对弯矩值的影响,建立考虑箱梁畸变的有侧向水平支承和无侧向水平支承的横向弯矩计算公式,结合数值算例进行分析,研究竖向荷载横向作用位置、腹板俯角、箱室高宽比、刚度比等箱梁参数变化时侧向水平支承对箱梁横向弯矩的影响程度.结果表明:侧向水平支承对箱梁横向弯矩的影响主要在于竖向荷载横向作用的位置;腹板俯角、箱室高宽比和刚度比的规律性变化不能使侧向水平支承对箱梁各角点横向弯矩误差产生明显一致的变化规律,影响不明显;竖向荷载作用在顶板范围内,侧向水平支承对矩形截面箱梁横向弯矩的影响很小,弯矩误差不超过0.72%,荷载作用在悬臂板上时误差将达到-16.14%.
In order to reveal the influence of suppositional lateral horizontal supports of the analysis model on the calculation of transverse bending moment of single box single cell thin-walled box girder,formula considering the distortion for calculating transverse bending moment of box girder with or without lateral horizontal supports is established.Combined with numerical examples,the influence of lateral horizontal supports on the transverse bending moment of box girder is analyzed when some box girder parameters such as vertical load position,web inclination,aspect ratio and stiffness ratio changed.The results show that the transverse position of vertical load is the main factor which affect the transverse bending moment of box girder.The regular change of the web inclination,aspect ratio and stiffness ratio of the box girder cannot make the lateral horizontal support produce an obvious and consistent change law of transverse bending moment error at each corner of box girder,and the influence is not obvious.When the vertical load is within the range of the roof,the lateral horizontal support has little influence on the transverse bending moment of the box girder with rectangular section,and the bending moment error is no more than 0.72%.When the load is applied on the cantilever plate,the error will reach-16.14%.
作者
王兆南
张元海
WANG Zhao-nan;ZHANG Yuan-hai(School of Civil Engineering,Lanzhou Jiaotong University,Lanzhou 730070,China)
出处
《兰州交通大学学报》
CAS
2019年第6期9-16,共8页
Journal of Lanzhou Jiaotong University
基金
国家自然科学基金(51968040,51468032)
关键词
薄壁箱梁
横向弯矩
畸变
侧向水平支承
箱梁参数
thin-walled box girder
transverse bending moment
distortion
lateral horizontal supports
box girder parameter
