摘要
为提高在役多车道空心板梁桥弯矩横向分布系数计算的准确性,提出考虑结构性能退化的弯矩横向分布系数计算方法。该方法通过建立不同参数组合的桥梁结构有限元模型,计算不同跨径和斜交角桥梁的弯矩横向分布状况,分析单侧、双侧铰缝不同损伤对弯矩横向传递的影响;以关键参数为自变量,弯矩比为变量,采用多元非线性回归分析法拟合得到弯矩横向分布系数简化计算公式,以及铰缝损伤引起的弯矩横向分布修正系数。实桥算例验证结果表明:该方法使用方便,计算结果可信,能够较好地适用于在役多车道空心板梁桥弯矩横向分布系数的计算。
To improve the accuracy of calculation of the moment lateral distribution factors of multi-lane hollow slab beam bridges in service, the calculation method for the moment lateral dis- tribution factors considering the degradation of structural performance of the bridges was pro- posed. In the method, the finite element models for the bridge structures of different parameter combinations were established, the moment lateral distribution conditions of the structures with different span length and skew angles were calculated and the influences of different damages of the one-side and two-side hinged joints on the transferring of the moment lateral distribution were analyzed. By taking the critical parameters as the independent variables and the moment rates as the variables, the simplified calculation formula of the moment lateral distribution factors and the modification factors of the moment lateral distribution caused by the hinged joint damages were fitted and were obtained by the multivariate nonlinear regression analysis method. The results of the calculation examples of practical bridges indicate that the proposed method is simple for us- age, the calculations of the method are reliable and the method can be well applied to the calcula- tion of the moment lateral distribution factors of the multi-lane hollow slab beam bridges in service.
出处
《桥梁建设》
EI
CSCD
北大核心
2014年第2期56-60,共5页
Bridge Construction
基金
交通部西部交通建设科技资助项目(200731882231)~~
关键词
板梁桥
弯矩横向分布系数
跨径
斜交角
铰缝损伤
有限元法
非线性回归分析
slab beam bridge
moment lateral distribution factor
span length
skew angle
hinged joint damage
finite element method
nonlinear regression analysis
