摘要
以单根斜梁模型模拟斜交连续箱梁,在三力矩方程基础上,分析非线性日照梯度温度作用下斜交连续箱梁的温度应力和位移,系统研究斜度和弯扭刚度比对三跨斜交连续箱梁温度应力和位移的影响,绘制的大量曲线清晰显示了其影响规律。研究结果表明,在常用斜度范围内,中跨梁底拉应力和梁顶压应力随斜度的增大而减小,随弯扭刚度比的增大而增大;边跨跨中有较大的上拱位移,且其值随斜度的增大而减小,随弯扭刚度比的增大而增大;中跨跨中位移随斜度增大将由下挠转变为上拱,其临界斜度随弯扭刚度比的增大而增大。
The single skew beam mechanical model is used to simulate skew continuous box girders. On the basis of the three-moment-equation, temperature stresses and displacements of skew continuous box girder bridges under nonlinear gradients of sunshine temperatures are analyzed in detail. The influence of the skew angle and the ratio of bending and torsion stiffness on the temperature stresses and displacements of three-span skew continuous box girders is studied systematically. A large number of curves clearly show the influence patterns. The results show as followings： Within the normal range of skew angles, the tension stress at the bottom and compression stress at the top of the middle span decrease as the skew angle increases and increase as the ratio of bending and torsion stiffness increases; large camber displacement exists in the middle of side spans, and the value decreases with the increase of the skew angle while increases with the increase of the ratio of bending and torsion stiffness; displacement in the middle of the central span changes from downwards to upwards with the increase of the skew angle, and the critical skew angle increases with the increase of the ratio of bending and torsion stiffness.
出处
《铁道学报》
EI
CAS
CSCD
北大核心
2009年第4期82-86,共5页
Journal of the China Railway Society
基金
甘肃省自然科学基金资助项目(3ZS042-B25-032)
甘肃省高等学校研究生导师科研项目(0804-09)
兰州交通大学"青蓝"人才工程基金资助项目(QL2004-A16)
关键词
斜交箱梁
斜交连续梁
温度应力
温度位移
非线性温度梯度
skew box girder
skew continuous beam
temperature stress
temperature displacement
nonlinear gradient of temperature
