腹板参数对增设中腹板的连续刚构桥加固方法的影响研究

Study on influence of web parameters on strengthening of continuous rigid frame bridge with adding middle web

为探讨腹板参数对增设中腹板的连续刚构桥加固方法的影响,针对腹板高厚比(箱梁中腹板高度与厚度的比值)和腹板布置数量进行比较分析。结果表明,在只改变板厚而不改变钢束数量的情况下,在腹板厚度相对较薄时,其抗弯和抗剪承载力提升幅度较大;在增加腹板厚度的同时相应增加钢束用量,则加固效果更加明显;双腹板加固效果不如单腹板加固效果好。建议根据实际工程,选取相对较薄的单腹板,在适量增加钢束用量的情况下进行加固设计。

In order to investigate the influence of web parameters on the reinforcement of continuous rigid frame bridges with mid-webs,it compares the ratio of web height to thickness(the ratio of web height to thickness in box girder)and the number of web layout.The results show that the bending and shear bearing capacity of the web is increased when the thickness of the web is relatively thin,and the thickness of the web is increased.The amount of the bundle is more obvious,and the reinforcing effect of the double web is not as good as that of the single web.It is recommended to select a relatively thin single web according to the actual project,and carry out reinforcement design under the condition of increasing the amount of steel bundle.