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龙河特大桥为大跨超高空心薄壁柔性墩连续刚构桥,为深入探究大桥墩梁固结处力学行为特点,对墩梁固结处开展1∶6缩尺模型试验。通过相似理论分析,确定模型各物理参量相似关系。针对结构及受力特点,对模型尺寸、预应力、配重、普通钢筋、加载和测试方案等进行设计。根据实桥有限元分析结果,确定试验工况。为确保能按试验工况加载,设计了一种新型特殊加载装置——“新型组合式加载装置”。试验表明,龙河大桥试验模型设计合理、试验加载方法可行,新型模型试验加载装置经济实用,各试验工况得到顺利完成,并且试验结果能较好反映实桥墩梁固结处受力特点规律。
Longhe Super Large Bridge is a continuous rigid frame bridge with long-span ultra-high-hollow and thin-walled flexible piers. In order to study the mechanical behaviors of bridge pier and girder, the 1: 6 scale model test is conducted on the consolidation of pier and girder. Through the similarity theory analysis, the similarities between the physical parameters of the model are confirmed. According to the structure and force characteristics, the model size, prestress, counterweight, ordinary steel, loading and testing programs are designed. According to the actual bridge finite element analysis results, determine the test conditions. In order to ensure that it can be loaded according to the test conditions, a new type of special loading device - “new combined loading device” was designed. The test shows that the experimental model of Longhe Bridge is reasonable and the test loading method is feasible. The new model test loading device is economical and practical, and the test conditions are successfully completed. The test results can well reflect the characteristics and laws of stress of consolidation at the pier.