简支梁式斜交矩形渡槽槽身结构受力分析

Analysis on structure character of simply supported skew beam rectangle aqueduct

分析了简支梁式斜交矩形渡槽的结构特性,推导出了其内力及支反力的计算公式,并与正交渡槽的受力特性进行了比较。结果表明,斜交渡槽槽身正弯矩较同等跨径的正交渡槽要小,在斜支承处还会产生负弯矩,且反力分布不均匀,钝角处反力大于锐角处反力;随着斜度增大,正弯矩在减小,而扭矩却在增大,具有弯扭耦合作用的特性,建议其截面型式以抗扭能力大的箱形截面为佳。

<Abstrcat>The article analyses the structure character of simply supported skew beam rectangle aqueduct and deduces the calculation formula of internal force and bearing force.Compared with cross aqueduct,the following conclusion is given.The positive moment of skew aqueduct is less than that of right cross aqueduct;The negative moment produces on the skew bearing while bearing force distribution is not uniform;The bearing force on obtuse angle is more than that on acute angle;With skew degree increasing,the positive moment decreases,but the torsion increases.Skew aqueduct has character of moment-torsion interaction.Therefore box section type having ability to resist torsion is recommended.