摘要
研究目的：以焦柳线4 m×128 m连续钢桁梁桥荷载试验为依托,论述空间薄壁结构应力测试的理论和方法,在理论计算和试验数据的基础上,分析主桁杆件的受力性能、传力特点、应力状态以及次应力影响。研究结论：通过分析表明：钢桁梁桥的主桁杆件主要承受轴向力作用,受力性质与设计理论一致;桥梁的空间传力作用与杆件间的连接刚度、杆件的位置以及荷载的作用点有关,按杠杆原理简化计算2片主桁间的荷载分配是偏于安全的;按空间梁单元模型计算的下弦杆应力比平面模型计算应力小9.9%~16.4%,＂桥检规＂中按平面杆系模型计算统计的结构校验系数通常值仅具有参考意义;主力组合下各测试杆件的实际应力小于设计允许应力,并有一定的强度储备;杆件的次应力与节点板和杆件本身的刚度成正比。
Research purposes： Based on the load test for the 4×128 m continunous steel truss girder bridge of the Jiaozhu-Liuzhou Railway,this paper describes the theory and method for testing the stress of spatial thin-wall structure and analyzes the stress performance of the main bar member,the power transmission characteristic and the stress condition as well as the secondary stress influence based on the theoretical calculation and tested data.Research conclusions：This analysis reveals ：（1） The steel truss girder bridge＇s main bar is mainly bearing the axial force,which is consistent with the design theory.（2） The effect of the spatial load transferring of the bridge is associated with the connection stiffness of the bars,the bar location and the load location,and to simplify the calculation of the load distribution between the two main trusses with the leverage method is safe.（3） Compared with the plane stress model,the stress of bottom chords calculated with the space beam element model is smaller by 9.9%~16.4%,and the verification coefficient to compute statistics structure with the plane trussing model stipulated in the ＂Code for Inspection of Railway Bridges＂ only has the reference meaning.（4） Under the condition of main force combination,the actual stress of each test member is smaller than the design permission stress and has certain margin for safety.（5） The secondary stress of the member is proportional with the rigidity of the gusset plate and member.
出处
《铁道工程学报》
EI
北大核心
2010年第9期20-24,50,共6页
Journal of Railway Engineering Society
关键词
钢桁梁
薄壁
应力测试
分析
steel truss
thin-wall
stress test
analyses
