全曲线波形板-UHPC组合桥面板优化设计  

Optimization design of wave plate-UHPC composite bridge deck with full curvilinear section

作　　者：戴杜伟 刘扬 鲁乃唯 DAI Du-wei;LIU Yang;LU Nai-wei(School of Civil Engineering,Changsha University of Science&Technology,Changsha 410114,China)

机构地区：[1]长沙理工大学土木工程学院,湖南长沙410114

出　　处：《交通科学与工程》2020年第2期58-65,共8页Journal of Transport Science and Engineering

基　　金：国家重点基础研究发展计划(2015CB057705);国家自然科学基金项目(51908068);湖南省自然科学基金项目(2018JJ3540)。

摘　　要：为提高正交异性钢桥面板疲劳性能,提出了一种全曲线截面形式的波形板-UHPC组合桥面板结构,研究了各截面设计参数对结构疲劳性能的影响。基于响应面法,优化了结构设计参数,并对优化后的结构的疲劳性能进行了数值分析。研究结果表明:横向投影长度、纵向投影长度及曲线次数都是影响结构力学性能的重要结构设计参数,增加纵向投影长度会明显增加结构自重和刚度,增加曲线次数会增加弯折处的应力集中程度;响应面法建立的回归模型拟合程度较好,实验值与响应面法预测值之间的误差为0.236%,优化后的设计参数较为理想;相比传统正交异性板,优化后组合桥面板结构的疲劳性能明显提高,顶板焊趾处疲劳寿命提高了4.9倍,横隔板焊趾处接近无限疲劳寿命。In order to improve the fatigue performance of orthotropic steel deck,a new type of wave plate-UHPC composite bridge deck structure with full curvilinear section was proposed.The influence of each design parameter of section on the mechanical properties of the structure was studied.The response surface method was used to optimize the design parameters,and the fatigue performance of the optimized structure was carried out.The research results show that the transverse projection length,longitudinal projection length and curve degree are important structural design parameters that affect the mechanical properties of the structure.The self weight and stiffness of the structure will be significantly increased,induced by the increase of longitudinal projection length.And the level of stress concentration at the bending position can be enhanced by the increase of curve degree.The regression model established by response surface method has a high fitting precision.The error between the experimental value and the predicted value by response surface method is 0.236%,and the optimized design parameters are satisfactory.Compared with the traditional orthotropic plate,the fatigue performance of the optimized composite deck structure is significantly improved,the fatigue life at the weld toe of the roof plate is increased by 4.9 times,and the fatigue life of the weld toe of the diaphragm plate is considered as nearly infinite.

关 键 词：钢桥面板 疲劳性能 组合结构 优化设计 响应面法 

分 类 号：U443.33[建筑科学—桥梁与隧道工程]