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我国正处于大规模基础设施建设的高峰,正在新建大量高等级公路与桥梁;与此同时,随着经济发展,交通量迅速增长,大量既有线路上的旧桥,需要进行拓宽改造、增加通行能力。桥梁拓宽改造的关键技术之一就是如何确定旧桥与拓宽新桥部分的纵向接缝,以及接缝对结构受力的影响。迄今为止,国内对大型桥梁拓宽改造纵向接缝问题的处理上还没有一个可靠和高效的连接模式,此类问题的成功解决,对于量大面广的既有桥梁拓宽改造具有重要的科学意义和工程应用价值。
At the same time, with the rapid economic development, the traffic volume has been rapidly increasing. As a result, a large number of old bridges on existing lines need to be expanded and rebuilt to increase traffic capacity . One of the key technologies for bridge widening and reconstruction is how to determine the longitudinal joints between the old bridge and the new bridge and how the joints affect the structure. So far, there has not yet been a reliable and efficient mode of connection for the extension and reconstruction of longitudinal joints in large bridges in China. The successful resolution of such problems has important scientific significance for widening and rebuilding existing and extensive bridges. Engineering application value.