考虑支座摩阻效应柔性墩纵向水平力优化设计

Optimal Design of Longitudinal Horizontal Force of Flexible Pier Considering Bearing Friction Effect

摘要:

为研究支座摩阻效应对柔性墩台纵向水平力的影响，基于墩顶抗推刚度集成法，提出了考虑支座摩阻效应墩顶纵向水平分配力的二次分配理论框架。基于某一简支梁桥采用本文理论方法进行摩阻系数为0，0.02，0.03，0.04，0.05，0.06下的墩顶水平力分析，并获取最优摩阻系数取值。结果表明：墩顶纵向水平力的分配与支座摩阻系数有关，不考虑支座摩阻力会使得墩顶水平力离散性较大，各墩顶水平力差异化明显。在计算汽车制动力对墩顶纵向水平分力影响时，支座的摩阻效应不可忽略。通过对某一实际简支梁桥计算分析，采用摩阻系数为0.03的支座可使得墩顶在纵向水平力分配更为合理。本文的研究成果可为桥梁结构的支座选用提供参考。

Abstract:

To study the effect of bearing friction effect on the longitudinal horizontal force of flexible pier and abutment, based on the integrated method of anti-thrust stiffness of pier top, the theoretical framework of secondary distribution of longitudinal horizontal force of pier top considering the effect of bearing friction is proposed. Combined with a simple-supported girder bridge, the theoretical method is used to analyze the horizontal force of pier top with the friction coefficients of 0, 0.02, 0.03, 0.04, 0.05 and 0.06, and the optimal values of the friction coefficients are achieved. The results show that the distribution of the longitudinal horizontal force of pier top is related to the bearing friction coefficient. The bearing friction resistance is not considered which can make the horizontal force of pier top discrete more greatly. The horizontal force of each pier top is differentiated obviously. When calculating the influence of the automobile braking force on the longitudinal horizontal force of pier top, the friction effect of bearing cannot be ignored. By calculating and analyzing an actual simply-supported girder bridge, the bearing with a friction coefficient of 0.03 can make the distribution of longitudinal horizontal force of pier top more reasonable.