波纹钢腹板梁疲劳性能的试验研究  

Experimental study on fatigue performance of the beam with corrugated steel webs

作　　者：谭莲飞[1] 王清远[1] 王志宇[1] 吴彦增[1] 

机构地区：[1]四川大学建筑与环境学院,四川成都610065

出　　处：《四川建筑科学研究》2012年第5期5-7,11,共4页Sichuan Building Science

基　　金：国家自然科学基金(50978174)

摘　　要：结合国内已建波纹钢腹板PC组合梁桥(平铁大桥)的波形尺寸,设计了4根Q345c高强钢的波纹钢腹板试验梁。试验首先对第一根梁(GA)进行四点弯曲静力试验,分析了其在竖向荷载作用下的受力特征和破坏形态;另外3根梁分别采用R=0.1,荷载下限分别为9,11,13 kN的不同条件下的疲劳试验。结果表明,由于波纹腹板的"折扇"效应,在弯矩作用下不完全满足平截面假定条件,弯矩主要由上下翼缘承受;二级焊缝条件下,试验梁波纹处焊缝能满足美国AASHTO规范B类焊接的疲劳强度,焊缝搭接位置以及构造处是该类型梁的疲劳薄弱位置之一。Combined with the built box-girder bridge with corrugated webs named Ping Tie Bridge,designed 4 beams with corrugated webs of Q345c high-strength steel.The first beam（GA） test for four-point bending static test,it tells the static characteristics and failure mode in the vertical load force.The other three beams were under fatigue test in different loading conditions,with R=0.1 and the load lower limits were 9,11,13 kN respectively.The results show that there is a ＂folding＂ effect in the corrugated web,thus the beam does not fully meet the plane section assumption under the action of the moment which mainly endured by the upper and lower flange.Under second level welding condition,the weld of corrugated web and flange may meet fatigue strength of Class B specifications according to United States AASHTO.The overlap of welding or constructions on the beam may be the fatigue weak positions.

关 键 词：疲劳试验 波纹钢腹板梁 焊接 

分 类 号：TU317[建筑科学—结构工程]