桥梁加宽中新增梁对旧桥的影响

Influence of Newly Added Girder on the Original Bridge in Bridge Widening

依托黄土地区高速公路改扩建桥梁加宽工程,选取一座3孔13 m简支空心板桥,分析新增空心板梁对旧桥原有板梁的影响。基于不同加宽方案对新旧桥空心板梁横向分布系数进行了计算,计算结果表明增加新梁截面刚度可有效降低旧梁横向分布系数。建议采用移旧桥边梁为新桥边梁并且提高新增空心板梁刚度的加宽方案。

Based on the highway reconstruction and bridge widening engineering in loess areas, a 13-meter-long simple-supporting hollow bridge with 3 apertures is taken as an example. The influence of newly added hollow girder on the original bridge is analyzed. Calculation of transverse-distributing parameters of the hollow girder of the original and new bridge is done to the various widening schemes. The calculation results show that newly added girder section rigidity can decrease the transverse-distributing parameters of the original girder effectively. The paper suggests that the side girder of the original and new bridge be used as the side girder of the new bridge and increase the rigidity of newly added hollow girder.