| 弹性阶段体外预应力钢束二次效应研究 |
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| 引用本文： | 张锋,徐栋,席广恒. 弹性阶段体外预应力钢束二次效应研究[J]. 结构工程师, 2006, 22(6): 19-24 |
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| 作者姓名： | 张锋 徐栋 席广恒 |
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| 作者单位： | 1. 同济大学桥梁工程系,上海,200092
2. 辽宁省交通勘测设计院,沈阳,110005 |
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| 基金项目： | 交通部西部交通建设科技项目 |
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| 摘 要： | 结合交通部2004年度西部交通建设项目《体外预应力桥梁设计施工技术研究》，利用体外预应力混凝土桥梁结构弹性阶段非线性分析程序，对体外预应力混凝土桥梁的二次效应进行了分析。分析中选择等截面预应力混凝土简支梁、等截面连续梁和大跨径变截面连续刚构桥等代表性桥梁结构形式。以结构跨径、跨高比、转向块间距、体外预应力钢束布置形式等为主要研究参数，研究体外预应力钢柬二次效应的影响程度。计算了工程实例的二次效应。研究表明在弹性阶段体外预应力混凝土桥梁的二次效应均较小。在设计中可不予考虑。
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| 关 键 词： | 体外预应力 二次效应 非线性 |
The Second-Effect Analysis of External Tendons in Elastic Stage |
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| ZHANG Feng,XU Dong,XI Guangheng. The Second-Effect Analysis of External Tendons in Elastic Stage[J]. Structural Engineers, 2006, 22(6): 19-24 |
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| Authors: | ZHANG Feng XU Dong XI Guangheng |
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| Affiliation: | 1. Department of Bridge Engineering, Tongji University, Shanghai 200092, China; 2. Communication Survey Design Institute of Liaoning Province, Shenyang 110005, China |
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| Abstract: | By using a nonlinear computer program for externally prestressed concrete bridges,the second-effect of external tendons in externally prestressed concrete beam bridges was analyzed.We analyzed three(typical) kinds of bridges: simply supported bridges,continuous bridges with constant section, continuous frame bridges with variable sections.The influence of span,span depth ratio,the spacing between deviators,the layout of external tendons was investigated.The second-effect in a practical bridge was also calculated at last. The results show that the second-effect of external tendons in elastic stage is so small that it can be neglected. |
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| Keywords: | externally prestressed second-effect nonlinear |
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