基于T梁锚固端裂缝的有限元分析
Finite Element Analysis of T-Beam Anchor End Cracks
钮雪凇 1陈顺超 1邬文祥 1聂良鹏 2游鹏升2
作者信息
- 1. 西南林业大学,云南 昆明 650224
- 2. 云南通衢工程检测有限公司,云南 昆明 650200
- 折叠
摘要
[目的]针对某特大桥中25 m钢筋混凝土T梁在采用后张法张拉后腹板处出现开裂的现象,对T梁端部进行锚下局部应力分析,并研究锚固区混凝土的应力分布状况.[方法]通过有限元软件对梁端部进行计算模拟,并对比分析腹板厚度对主应力的影响.[结果]试验结果表明,T梁内腹板处的主应力随腹板厚度的增加而逐渐降低,得出该T梁截面设计不合理,等厚腹板T梁设计能有效防止裂缝的产生.[结论]研究成果可为预应力混凝土连续梁桥的相关设计提供参考.
Abstract
[Purposes]Aiming at the phenomenon of cracking at the web of a 25 m reinforced concrete T-beam in a large bridge after being tensioned by post-tensioning method,the local stress analysis of the end of the T-beam under anchor was carried out and the stress distribution of concrete in the anchoring area was studied.[Methods]The end of the beam was simulated by finite element software and the influ-ence of web thickness on the principal stress was compared and analyzed.[Findings]The test results show that the principal stress at the inner web of T-beam decreases gradually with the increase of the thickness of the web,and the section design of the T-beam is unreasonable,and the design of the T-beam with equal thickness web can effectively prevent the occurrence of cracks.[Conclusions]The above conclusions can provide reference for the design of prestressed concrete continuous beam bridges.
关键词
T梁/腹板厚度/锚固端/有限元分析Key words
T-beam/web thickness/anchor end/finite element analysis引用本文复制引用
出版年
2024
NETL
NSTL
万方数据