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首页> 外文期刊>International journal of architectural heritage >Assessment of load carrying capacity enhancement of an open spandrel masonry arch bridge by dynamic load testing
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Assessment of load carrying capacity enhancement of an open spandrel masonry arch bridge by dynamic load testing

机译：通过动态载荷测试评估空心桥砌体拱桥的承载能力

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摘要

Health monitoring of masonry railway bridges is vital due to their long life in service, an increasing demand for higher axle loads, and the recent trends in sustainability that requires the preservation of aged masonry bridges. Safety assessment of a 70-year-old masonry arch bridge is presented. The bridge is situated in a S-shaped curved section of the track and has long spans of 36 m. Added the deterioration of masonry due to old age of the bridge and complex behavior of masonry arch bridges, dynamic load tests are employed and global structural responses to allowable loading schemes of the bridge are determined. Dynamic amplification factors are determined and compared to those proposed by standards and it is concluded that experimental values are higher than those proposed by standards. Model calibration is carried out using deflection signatures. Experimental and analytical natural frequencies are compared for model verification. Having the model calibrated and verified, safety of bridge in serviceability and ultimate limit states due to application of operational loading schemes and higher axle loads are assessed. It is concluded that the bridge is safe regarding operational loading patterns, and could withstand an increased axle load of 25 tons.
机译：由于砖石桥梁的使用寿命长，对更高轴重的需求不断增加以及需要保留老化的砖石桥梁的可持续发展的最新趋势，因此，对其进行健康监测至关重要。介绍了一座具有70年历史的砌体拱桥的安全性评估。该桥位于轨道的S形弯曲部分，跨度为36 m。加上由于桥梁的老化和砌体拱桥的复杂行为导致的砌体恶化，采用了动态荷载试验，并确定了对桥梁允许荷载方案的整体结构响应。确定了动态放大因子，并将其与标准建议的值进行比较，得出的结论是实验值高于标准建议的值。使用偏斜签名进行模型校准。比较实验和分析固有频率以进行模型验证。通过对模型进行校准和验证，可以评估桥梁在可使用性和最终极限状态下的安全性（由于应用了运行载荷方案和较高的车轴载荷）。结论是，该桥在操作载荷模式方面是安全的，并且可以承受25吨增加的轴载荷。

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