开口纵肋钢桥面板疲劳性能研究

郭凯; 张晓亮; 周宇; 夏清

doi:10.13204/j.gyjzG21031203

开口纵肋钢桥面板疲劳性能研究

doi: 10.13204/j.gyjzG21031203

1. 云南楚大高速公路投资开发有限公司, 云南大理 671099;
2. 云南省交通运输厅, 昆明 650031

基金项目:

云南省交通运输厅科技创新示范项目(云交科教[2018]41号)。。

详细信息

作者简介:
郭凯,男,1972年出生,教授级高级工程师。电子信箱:624109932@qq.com

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出版历程
- 收稿日期: 2021-03-12
- 网络出版日期: 2022-03-29

RESEARCH ON FATIGUE PERFORMANCES OF STEEL BRIDGE DECKS WITH OPEN-SHAPED LONGITUDIRAL RIBS

1. Yunnan Chuda Expressway Investment and Development Co., Ltd., Dali 671099, China;
2. Department of Transportation of Yunnan Province, Kunming 650031, China

摘要

摘要: 为研究开口纵肋钢桥面板的疲劳性能,依托云南楚大高速公路项目,以疲劳开裂问题最为突出的纵肋与顶板焊接细节和纵肋与横隔板交叉构造细节为研究对象,对开口纵肋钢桥面板的疲劳性能及其关键影响因素进行了系统研究。研究结果表明:纵肋与顶板焊接细节的纵向影响线长度主要在关注构造细节相邻的两个横隔板之间,纵肋与横隔板交叉构造细节的纵向影响线长度主要在关注构造细节相邻的两跨范围内;在纵向移动荷载作用下顶板焊趾开裂模式(C1)的热点应力幅值最大,为125.8 MPa,当铺设8 cm厚的混凝土现浇层之后顶板焊趾开裂模式的热点应力幅值降为10.7 MPa,降幅为91.5%;纵肋高度的变化对开口纵肋钢桥面板各疲劳开裂模式的应力幅值无显著影响,增加纵肋间距将显著增大横隔板焊趾开裂模式(C4)的应力幅值;带混凝土现浇层的开口纵肋钢桥面板各开裂模式的应力幅值均较低,疲劳开裂风险较小。
- 开口纵肋 /
- 钢桥面板 /
- 有限元 /
- 疲劳性能 /
- 混凝土现浇层
Abstract: In order to research the fatigue performance of steel bridge deck with open-shaped longitudinal ribs, the rib-to-deck welded joint and rib-to-diaphragm welded joint were considered as research objects, based on the Yunnan Chuda Expressway project, the fatigue performance and key influencing factors of steel bridge decks with open-shaped longitudinal ribs were systematically studied. The results indicated that the length of the longitudinal influence line of rib-to-deck welded joint was mainly between the two adjacent diaphragms of the structural details. The length of the longitudinal influence line of rib-to-diaphragm welded joint was mainly within the two adjacent spans of the structural details. The hot-spot stress amplitude of the deck toe cracking mode(C1) was the largest under the longitudinal moving load, which was 125.8 MPa. After laying an 8 cm thick cast-in-situ concrete layer, the hot-spot stress amplitude of the deck toe cracking mode was reduced to 10.7 MPa, a reduction of 91.5%. The change of the rib height had no significant effect on the stress amplitude of each fatigue cracking mode of the steel bridge decks with open-shaped longitudinal ribs. Increasing the rib spacing would significantly increase the stress amplitude of the diaphragm toe cracking mode(C4). The stress amplitude of each cracking mode of the steel bridge deck with open-shaped longitudinal ribs and cast-in-situ concrete layer was at a low level, the risk of fatigue cracking was small.
- open-shaped longitudinal rib /
- steel bridge decks /
- finite element /
- fatigue performance /
- cast-in-situ concrete layer

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