梁端斜裂缝对重载铁路32m跨度简支T梁受力性能影响研究  

Influence of Inclined Crack on Loaded Property of 32m Normal Highly Prestressed Concrete Beam

作　　者：罗慧刚[1] Luo Huigang(Shuohuang Railway Development Co. Ltd., Yuanping 034100, China)

机构地区：[1]朔黄铁路发展有限责任公司原平分公司,山西原平034100

出　　处：《石家庄铁道大学学报（自然科学版）》2017年第4期12-19,共8页Journal of Shijiazhuang Tiedao University(Natural Science Edition)

摘　　要：以重载铁路32 m跨度简支T梁为研究对象,采用数值仿真分析和现场试验相结合的方法,开展梁端斜裂缝对桥梁受力性能影响研究。结果表明:重载运输快速发展引起桥梁结构主梁结构横向、竖向和纵向受力大幅增加,振动和疲劳加剧,简支T梁端部位置出现大量45°斜向裂缝并迅速发展,斜裂缝引起桥跨结构竖向和横向自振频率降低,桥梁整体承载能力下降,危及行车安全,通过采用粘贴钢板等措施能够达到病害处治的目的。Taking the 32m simply supported T beam of heavy haul railway as the object oi stuay , combining the Finite Element Simulation Analysis and performance Test, the influence of the diagonal crack of beam end on mechanical properties of the bridge is studied.The conclusion is drawn： Rapid de- velopment of heavy haul transportation causes a sharp increase of transverse, vertical and longitudinal stresses of the main beam of the bridge structure, and the vibration and fatigue has sharply intensified, too, causing 45 degree diagonal cracks to appear on the beam-end of simply supported T beam and de- velop rapidly, which causes decreased vertical and transverse natural frequency of the bridge structure, and the general carrying capacity of the bridge is declined, thus endangering security of the vehicles. Measures such as sticking plates are adopted to treat these diseases.

关 键 词：重载运输 32 m普通高度预应力梁 斜裂缝 受力性能 

分 类 号：U24[交通运输工程—道路与铁道工程]