装配式混凝土简支斜梁桥基频实用计算公式  

Improved calculation formula of fundamental frequency for the fabricated concrete simple supported skew girder bridges

作　　者：于振刚[1] 李岩[2] 杨婷婷[2] 鲁开元 YU Zhen-gang;LI Yan;YANG Ting-ting;LU Kai-yuan(CCCC First Highway Consultants Co., Ltd., Xi’an 710065, China;School of Transportation Science and Engineering, Harbin Institute of Technology, Harbin 150090, China;Guangzhou Expressway Co., Ltd., Guangzhou 510000, China)

机构地区：[1]中交第一公路勘察设计研究院有限公司,陕西西安710065 [2]哈尔滨工业大学交通科学与工程学院,黑龙江哈尔滨150090 [3]广州市高速公路有限公司,广东广州510000

出　　处：《兰州理工大学学报》2020年第5期144-148,共5页Journal of Lanzhou University of Technology

基　　金：国家自然科学基金(51108132);黑龙江省自然科学基金(LH2019E049)。

摘　　要：以一座典型装配式混凝土简支梁桥为工程背景,采用数值分析方法开展斜交角、跨径、桥面宽度和横向扭转刚度对斜梁桥基频的影响分析.结果表明:随着斜交角增长,桥梁前三阶竖向振型对应频率增大;随斜梁桥跨径增大,结构整体竖向刚度降低,基频明显减小,减小速率趋缓;受斜梁桥弯扭耦合力学特征影响,基频随截面抗扭刚度增加显著提高.依据各关键参数对斜梁桥基频的影响分析结果,在现行规范桥梁基频估算公式的基础上,提出考虑截面抗扭刚度和斜交角的混凝土简支斜梁桥基频估算改进公式.通过多座实桥试验数据验证改进公式的精度和适用性.Taking a prestressed concrete prefabricated simply supported girder bridge as engineering background,the influence of oblique angle,span,bridge width and transverse torsional stiffness on the fundamental frequency of the bridge is analyzed by numerical method.The results show that as the skew angle becomes larger,the first three orders of the vertical natural vibration frequencies increase.With the increase of the span,the whole vertical stiffness becomes lower,the fundamental frequency reduce obviously,but the rate to deduction decreased gradually.The fundamental frequency affected by the mechanical characteristic of coupling of bending and torsion increases with the increase of torsional stiffness.Based on the influence of key factors above on the base frequency of the skew beam bridge,an improved formula,taking the torsional stiffness and the skew angle into account,for estimating the base frequency of the concrete simply supported skew beam bridge is therefore proposed.The precision and the applicability of the formula are verified by all measured data of several real bridges.

关 键 词：简支梁桥 斜交角 基频 修正公式 车桥振动 

分 类 号：TU31[建筑科学—结构工程] U448.22[建筑科学—桥梁与隧道工程]