正交异性钢桥面板足尺模型疲劳试验研究

发布时间：2018-01-16 12:19

本文关键词：正交异性钢桥面板足尺模型疲劳试验研究　出处：《桥梁建设》2016年04期 　论文类型：期刊论文

【摘要】：为研究公路钢桥正交异性板的疲劳破坏行为及疲劳强度,以重庆江津中渡长江大桥为背景,选取其主跨梁段建立正交异性钢桥面板的足尺试验模型,进行疲劳试验。试验过程中对疲劳易损构造处的应力数据进行采集,观测其开裂情况,并采用热点应力法评估其疲劳强度。结果表明:加劲肋腹板与横隔板切口焊接处出现疲劳裂缝;顶板与加劲肋腹板焊接处出现纵向疲劳裂缝;横隔板切口处无疲劳裂缝产生,但存在较大拉应力;加劲肋腹板与横隔板切口焊接处的疲劳强度大于Eurocode规范中的90类细节的疲劳强度,也大于AASHTO规范中的C类疲劳强度,顶板与加劲肋腹板焊接处的疲劳强度大于Eurocode规范中的112类细节的疲劳强度,也大于AASHTO规范中的C类疲劳强度。
[Abstract]:In order to study the fatigue failure behavior and fatigue strength of orthotropic plate of highway steel bridge, the full-scale test model of orthotropic steel bridge face slab is established based on Chongqing Jiangjin Zhongdu Yangtze River Bridge. During the test, the stress data of fatigue vulnerable structures were collected and the cracking was observed. The fatigue strength was evaluated by hot spot stress method. The results showed that fatigue cracks appeared in the weld of stiffened rib web and transverse partition. Longitudinal fatigue cracks appear in the welding of roof and stiffened rib web; There is no fatigue crack at the incision of the transverse partition, but there is a large tensile stress. The fatigue strength of the welded joint of stiffened ribbed web and transverse partition is greater than that of 90 details in Eurocode code and the fatigue strength of class C in AASHTO code. The fatigue strength of welded roof and stiffened ribbed webs is higher than that of Eurocode code in class 112-detail and C-type fatigue strength of AASHTO code.
【作者单位】：西南交通大学土木工程学院;
【分类号】：U446.1;U443.31
【正文快照】： 1引言正交异性板由于其自重轻、强度高、承载能力大、安装速度快、造型美观及适用范围广等优点,被广泛应用于大跨度桥梁结构中。但由于其空间焊接结构复杂,导致正交异性板易于发生疲劳开裂[1-2]。英国的塞文桥在通车5年后便发现疲劳裂缝,裂缝位于加劲肋与顶板、腹板焊接处,我

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