| 预应力混凝土连续弯梁桥墩顶开裂分析 |
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| 引用本文： | 张举兵,蔡美峰,牟在根.预应力混凝土连续弯梁桥墩顶开裂分析[J].北京科技大学学报,2006,28(3):227-230,241. |
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| 作者姓名： | 张举兵 蔡美峰 牟在根 |
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| 作者单位： | 北京科技大学土木与环境工程学院,北京,100083 |
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| 摘 要： | 为研究预应力连续弯梁桥墩顶开裂或主梁侧倾的原因,将预应力钢束对混凝土梁的作用简化为等效荷载,用三维梁单元对预应力张拉施工过程进行了有限元模拟.对采用墩梁固结的预应力弯梁桥进行计算的结果表明,张拉时所引起的独柱墩顶弯矩的方向和自重引起的弯矩方向相同,并大一个数量级,此二者共同作用是造成预应力混凝土连续弯梁桥墩顶开裂或主梁侧倾事故的原因.并通过对比计算,提出了预防墩顶开裂的建议.
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| 关 键 词： | 预应力混凝土 弯梁桥 桥墩 等效荷载 开裂 预应力混凝土 连续弯梁 桥墩 开裂分析 concrete bridge prestressed cracking analysis 预防 对比计算 事故 共同作用 方向 弯矩 独柱墩 预应力张拉 结果 弯梁桥 固结 有限元模拟 |
| 收稿时间： | 2005-01-06 |
| 修稿时间： | 2005-01-062005-02-16 |
Cause analysis of cracking on the top of curved prestressed concrete bridge piers |
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| ZHANG Jubing,CAI Meifeng,MU Zaigen.Cause analysis of cracking on the top of curved prestressed concrete bridge piers[J].Journal of University of Science and Technology Beijing,2006,28(3):227-230,241. |
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| Authors: | ZHANG Jubing CAI Meifeng MU Zaigen |
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| Institution: | Civil and Environmental Engineering School, University of Science and Technology Beijing, Beijing 100083, China |
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| Abstract: | An FEM simulation using three-dimensional beam element was performed in order to study the causes of cracking on the top of curved prestressed concrete girder bridge piers, where the prestressing tendons were simplified as forces acting on the concrete girder. The results indicate that the direction of moment on the top of a single pillar pier caused by prestressing and that caused by dead load are identical, and the former is 1 order of magnitude higher. These two moments are the main causes of cracking on the top of the piers. By comparative computation, applicable suggestions were proposed to prevent the cracking of a pier. |
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| Keywords: | prestressed concrete curved bridge pier equivalent load cracking |
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