| 预应力混凝土连续箱梁开裂后的刚度退化模型 |
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| 引用本文： | 叶见曙,张峰.预应力混凝土连续箱梁开裂后的刚度退化模型[J].中国公路学报,2007,20(6):67-72. |
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| 作者姓名： | 叶见曙 张峰 |
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| 作者单位： | 1. 东南大学,交通学院,江苏,南京,210096
2. 东南大学,交通学院,江苏,南京,210096;山东大学,土建与水利学院,山东,济南,250061 |
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| 基金项目： | 国家西部交通建设科技项目;江苏省交通科学研究计划 |
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| 摘 要： | 为了研究预应力混凝土连续箱梁开裂后的刚度退化规律,基于CB壳单元,采用层状模型模拟预应力混凝土结构;考虑加载和卸载效应及材料和几何双重非线性效应,有效地模拟了三跨连续斜交箱梁的开裂、屈服和失效全过程。基于非线性有限元分析,提出了一种预应力混凝土箱梁开裂后的刚度退化模型,由该模型计算了预应力混凝土箱梁开裂后的刚度折减量。结果表明:CB壳单元模型对于预应力混凝土箱梁的非线性分析有良好的适应性,对箱梁开裂后的使用性能评估有实际应用价值。
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| 关 键 词： | 桥梁工程 连续箱梁 非线性有限元分析 刚度退化模型 CB壳单元 层状模型 |
| 文章编号： | 1001-7372（2007）06-0067-06 |
| 收稿时间： | 2007-03-20 |
| 修稿时间： | 2007年3月20日 |
Stiffness Degeneration Model of Prestressed Concrete Continuous Box Girder After Cracking |
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| YE Jian-shu,ZHANG Feng.Stiffness Degeneration Model of Prestressed Concrete Continuous Box Girder After Cracking[J].China Journal of Highway and Transport,2007,20(6):67-72. |
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| Authors: | YE Jian-shu ZHANG Feng |
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| Abstract: | In order to study stiffness degeneration rules of prestressed concrete continuous box girder after cracking,considering loading and unloading effect,material and geometric bi-nonlinear effect,whole process of cracking,yielding,failure of a three-span continuous skew box girder was simulated effctively by using CB shell element and layered model on simulation of prestressed concrete structure.A stiffness degeneration model of prestressed concrete continuous box girder after cracking was put forward based on nonlinear finite analysis.In the same time,the stiffness degeneration value of prestress concrete continuous box girder was computed based on presented model.The results show that CB shell element can well describe the nonlinear behavior of concrete box girders and is valuable to evaluate the service ability of the cracked box girder. |
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| Keywords: | bridge engineering continuous box girder nonlinear finite element analysis stiffness degeneration model CB shell element layered model |
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