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中文摘要：
为了确定预应力混凝土箱梁的极限承载能力，进行了预应力混凝土连续箱梁的破坏性试验，提出一种有限元损伤分析方法模拟箱梁结构行为．基于实体退化壳单元对箱梁进行模拟，并考虑了结构材料的非线性效应．由于预应力混凝土箱梁中通常存在大量曲线预应力钢筋，提出一种组合单元，并用该单元模拟箱梁中的预应力钢筋，该方法可使结构分析时单元数量大大降低．试验结果和理论分析对比表明：提出的方法能够有效地用于预应力混凝土连续箱梁的破坏性试验计算分析中；研究的旧桥依然存在较大的极限承载能力．
英文摘要：
In order to analyze the load carrying capacity of prestressed concrete box girders, failure behaviors of in-situ deteriorated continuous prestressed concrete box girders under loading are experimentally observed and a finite failure analysis method for predicting behaviors of box girders is developed. A degenerated solid shell element is used to simulate box girders and material nonlinearity is considered. Since pre-stressed concrete box girders usually have a large number of curve prestressed tendons, a type of combined element is presented to simulate the prestressed tendons of box girders, and then the number of elements can be significantly reduced. The analytical results are compared with full-scale failure test results. The comparison shows that the presented method can be effectively applied to the failure analysis of in-situ continuous prestressed concrete box girders, and it also shows that the studied old bridge still has enough load carrying capacity.
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Elastic analysis of stress-displacement field for a lined circular tunnel at great depth due to grou
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