| 收缩徐变对开裂后预应力混凝土箱梁桥结构的影响 |
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| 引用本文： | 彭仙淼,陈惟珍. 收缩徐变对开裂后预应力混凝土箱梁桥结构的影响[J]. 中国市政工程, 2012, 0(5): 32-34,38 |
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| 作者姓名： | 彭仙淼 陈惟珍 |
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| 作者单位： | 1. 广东省公路建设有限公司,广东广州,510600
2. 同济大学桥梁工程系,上海,200092 |
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| 摘 要： | 收缩徐变可能会对结构产生诸多不利影响,如增大挠度、导致预应力损失、在超静定结构中产生次反力等。预应力混凝土箱梁桥收缩徐变影响研究是目前工程界的热点之一。但普遍的分析中并未考虑裂缝出现后结构部分部位刚度降低所引起的非线性特征,而实际工程中裂缝可能在使用阶段初期甚至施工阶段就已经出现。收缩徐变对结构的影响可能因裂缝的出现有较大程度的差异,故从挠度、应力、支反力等方面就收缩徐变对开裂后结构性能的影响展开研究。
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| 关 键 词： | 收缩徐变 开裂后 预应力混凝土箱梁 |
On Influence of Shrinkage & Creep to Prestressed Concrete Box Girder Bridge Structure after Cracking |
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| PENG Xian-miao,CHEN Wei-zhen. On Influence of Shrinkage & Creep to Prestressed Concrete Box Girder Bridge Structure after Cracking[J]. China Municipal Engineering, 2012, 0(5): 32-34,38 |
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| Authors: | PENG Xian-miao CHEN Wei-zhen |
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| Affiliation: | 1.Guangdong Highway Construction Co.,Ltd.,Guangzhou 510600,China;2.Bridge Engineering Department,Tongji University,Shanghai 200092,China) |
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| Abstract: | Shrinkage & creep may result in many adverse effects on the structure such as increasing the deflection,leading to loss of prestress,generating sub-reaction force in statically indeterminate structure,etc.Research on shrinkage and creep of prestressed concrete box girder bridge is one of the highlights for current engineering field.But the general analysis did not consider the nonlinear characteristics caused by parts stiffness reduction of the structure after cracking.In practical projects,the cracks may appear on the early service stage or even construction phase.Shrinkage & creep effects on the structure may emerge a greater degree of difference because of cracks.Therefore,it should develop the research on the influence of structure performance after cracking by shrinkage & creep from the aspects of deflection,stress,and reaction,etc. |
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| Keywords: | shrinkage & creep after cracking prestressed concrete box girder |
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