超载作用下中美规范响应分析  

Specification Response Analyse of China and the United States Under Overload

作　　者：闵亚芝 孙华强[1] 赵吉[1] 

机构地区：[1]长安大学桥梁与隧道陕西省重点实验室,西安710064

出　　处：《四川理工学院学报（自然科学版）》2015年第2期86-91,共6页Journal of Sichuan University of Science & Engineering(Natural Science Edition)

基　　金：第55批中国博士后基金项目(2014M552395)

摘　　要：当代中国交通现状中,汽车超载已经成为引起交通事故和结构安全受损的重要因素之一。针对这一现象,以一座典型的6×70 m预应力混凝土连续梁桥为工程背景,利用监控得到的重载车辆数据作为超限荷载建立有限元模型,通过分析和比较桥梁在中国新旧桥梁规范及美国AASHTO规范的设计荷载和超限荷载下的最大挠度、内力和应力,讨论超载对桥梁的危害。结果表明美国规范在设计可靠性方面更加保守,具有更高的抗拉能力和抗剪能力,对我国规范改进及桥梁设计具有较大的参考价值。In existing traffic situation in china, the vehicle overload has become one of the most important factors for traffic accidents and structural safety damage. Aiming at this phenomenon, a typical 6 x 70m prestressed concrete continuous beam bridge is took as the engineering background. The data of overloaded vehicle from real-monitoring is used as excessive load to build the finite element model of the bridge. By analyzing and comparing the maximum deflection, internal force and stress under the designed load and excessive load specified in the old and new Chinese codes and the AASHTO code, the impact of overload on the bridge is discussed. The results show that the AASHTO code is more conservative in reliability design, and has higher tensile and shear ability, it has great reference value for specification improvement and bridge design in our country.

关 键 词：桥梁工程 汽车超载 预应力混凝土连续梁 设计车辆荷载 中美规范对比 

分 类 号：TB115[理学—数学]