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体外索被广泛地应用于预应力混凝土桥梁的建设与加固中,长乐市航兴桥是一座主跨30.5m的桁架拱桥,采用体外预应力加固。为评价采用这种方法加固桁架拱桥的效果,对桥梁加固前后进行了静动力性能实验研究。结果表明:体外预应力加固对桁架拱桥上弦杆裂缝闭合有明显效果,提高了截面的有效惯性矩;桥梁前几阶自振频率有所提高,其中第2阶频率提高较为明显;静力试验挠度校验系数较加固前明显减小。
Extracorporeal cable is widely used in the construction and reinforcement of prestressed concrete bridges. Changxing Hangxing Bridge is a 30.5m truss arch bridge with external reinforcement. In order to evaluate the effect of strengthening truss arch bridge by this method, the static and dynamic performance of the bridge was experimentally studied. The results show that the reinforcement of prestressed concrete beams has a significant effect on the closure of cracks on the chords of the truss arch bridge, and the effective moment of inertia of the cross section has been improved. The natural frequency of the first few steps of the bridge has been improved. The frequency of the second order increases obviously. The calibration coefficient was significantly lower than before consolidation.