小箱梁加宽桥在高速公路改扩建中的应用和受力性能研究  

Research on Application and Mechanical Performance of Minor Prefabricated Box Girder in Bridge Widening of Expressway Expansion Project

作　　者：吴斌峰 徐金华 WU Bin-feng;XU Jin-hua(CCCC First Highway Consultants Co.Ltd.,Xi'an 710075,China;Shanxi Transportation Planning Survey and Design Institute Co.Ltd.,Taiyuan 030032,China)

机构地区：[1]中交第一公路勘察设计研究院有限公司,西安市710075 [2]山西省交通规划勘察设计院有限公司,太原市030032

出　　处：《公路》2025年第1期282-286,共5页Highway

摘　　要：近年来,小箱梁加宽桥在高速公路改扩建中得到广泛应用,而新旧桥梁的拼接方式是桥梁加宽的关键。以山西昔榆高速拼宽桥为工程背景,利用数值模拟方法,首先论述了减少不均匀沉降的应对措施;其次对不同湿接缝拼接宽度下的主梁跨中弯矩进行研究;最后对比分析了湿接缝铰接和刚接两种拼接方式的受力性能。结果表明,拼接后拼接处相邻的主梁受力性能影响最大;拼接湿接缝的宽度越小,拼接处连接刚度越大,其受力越合理,且宽度在40~60 cm范围时可以有效降低旧桥弯矩,提高新旧桥梁整体受力;与湿接缝铰接拼接方式相比,刚接拼接方式下加宽桥的受力性能更为合理。In recent years,the widening of prefabricated box girder bridges has been widely used in the expansion project of expressway,and the splicing method of the new bridge and the original bridge is the key to bridge widening.In the paper,taking the bridge widening of Xiyang-Yuci Expressway in Shanxi Province as the engineering background,by means of numerical simulation methods,the countermeasures for reducing uneven settlement are discussed firstly.Secondly,the mid-span bending moment of the main beam under different wet joints splicing widths is studied.Finally,a comparative analysis is conducted on the stress performance of wet joint hinge and rigid joint splicing methods.The results show that the stress performance of the adjacent main beams at the splicing location is most affected after splicing.The smaller the width of the spliced wet joint,the greater the connection stiffness at the splicing location,and the more reasonable its stress distribution.A width range of 40 cm to 60 cm can effectively reduce the bending moment of the original bridge and improve the overall stress of the new bridge and the original bridge.Comparing the stress performance of the two splicing methods,it can be concluded that the stress performance of the widened bridge under the rigid splicing method is more reasonable.

关 键 词：桥梁工程 改扩建工程 加宽桥 湿接缝拼接 刚接 拼接方式 应力分析 

分 类 号：U445.6[建筑科学—桥梁与隧道工程] U441.5[交通运输工程—道路与铁道工程]