摘要
采用经试验验证的数值模拟方法对大量不同跨度、半径、支承类型和截面形式的混凝土连续曲线箱梁桥进行分析,讨论了各种不平度等级下冲击系数与圆心角、弯扭刚度比、综合影响系数和竖向弯曲振动基频之间的参数相关性,计算了对应的相关系数。结果表明:当不平度等级从A级变化到D级时,除中跨跨中的内力冲击系数外,主梁的弯矩、扭矩、剪力、挠度和反力冲击系数与竖向弯曲振动基频、圆心角和综合影响系数均呈负相关,而与弯扭刚度比则呈正相关;各项内力、挠度和支座反力的冲击系数与结构竖弯基频的相关性最大,且受不平度等级变化的影响较小。
Massive concrete continuous curved box girder bridges with different span lengths, curvature radii, bearing types, and section types are analysed using a validated numerical method. The parameter correlations of the impact factor with central angle, ratio of bending rigidity to torsional rigidity, and fundamental frequency of vertical bending vibration mode in different road ro integral impact coefficient ughnesses are discussed, and the corresponding correlation coefficients are calculated as well. The result shows that （ 1 ） when the road roughness varies from class A to class D, apart from the internal force impact factors of the center of the mid- span, the impact factors of bending moment, torsional moment, shear force, deflection and reaction force of main girder are negatively correlated to the fundamental frequency of vertical bending vibration, central angle and integral impact factor, while positively correlated to the ratio of bending rigidity to torsional rigidity; （2） the impact factors of internal forces, deflections and reaction forces of bearings are most closely correlated with the fundamental frequency of vertical bending vibration, and less influenced by the variation of road roughness.
出处
《公路交通科技》
CAS
CSCD
北大核心
2015年第5期75-80,共6页
Journal of Highway and Transportation Research and Development
基金
国家自然科学基金项目(51108086)
福建省教育厅项目(JA10046
JA11024)
关键词
桥梁工程
曲线箱梁桥
分离迭代法
冲击系数
圆心角
竖向弯曲振动基频
弯扭刚度比
bridge angle
fundamental engineering
curved box-girder bridge
separate iterative method
frequency of vertical bending
ratio of bending rigidity to torsional impact factor
central rigidity
