钢筋混凝土拱桥的评估与加固前后性能对比分析

随着时间的推移,越来越多的桥梁将达到或接近其设计基准期,或因为各种原因发生结构性损伤需要维修、加固和改造。在维修加固前,均需对其进行合理的检测和评价,得出桥梁的实际状况和承载能力,分析病害、损伤的成因,从而提出有效的维修加固措施。以球溪河大桥为例,介绍了钢筋混凝土拱桥的检测方法、检测结果以及加固措施,并对该桥加固前后静力和动力性能作对比分析。分析结果表明,加固后的主拱圈具有较大的刚度和强度;结构整体受力处于弹性状态,具有良好的动力性能;验证了加固设计是合理的。

Study on evaluation and comparison of the capability before and after strengthening of reinforced concrete arch bridge

With time going on, more and more bridges will reach or approach their design service life and the structural damages will appear due to various kinds of reasons, which need to be maintained, reinforced and reformed. Before maintained and reinforced, the old bridge should be rationally detected and evaluated. After getting the actual condition of a bridge and carrying capacity, we can analyze the reasons of diseases and detection, thus put forward the effective measure of maintenance and strengthening. Taking the qiuxi river bridge as an example, this paper introduces the method and result of detection on reinforced concrete arch bridge as well as the method of strengthening, compares static and dynamical capability of the bridge before and after strengthening. The analysis results indicate that the arch has enough strength and stiffness;the whole structure works at elastic state and has nicer dynamical capability. The strengthening design is rational.