空腹式板拱桥承载力及技术状况分析

Analysis of bearing capacity and technical condition of hollow-type slab arch bridges

对于早期修建的钢筋混凝土空腹式板拱桥,多数存在荷载等级低、整体性差的问题。随着使用年代的增长,其承载力、刚度以及耐久性降低,很大程度上影响了桥梁的运营安全性。因此,桥梁在使用过程中,对其进行技术状况和承载力评价是十分必要的。文章以某空腹式板拱桥为例,运用有限元软件Mi-das/civil建立有限元模型,通过现场外观检测和荷载试验数据对该板拱桥进行承载力和技术状况评定。结果表明:该桥的承载力验算满足城-A级荷载要求,但是外观检测结果显示该桥局部构件存在安全隐患。文章提出的评定技术对类似桥梁的承载能力分析和评定具有一定的参考价值。

For the early constructed reinforced concrete hollow slab arch bridges,most of them showed problemssuch as low load level and poor integrity.With the increase of year of their usage,the bearing capacity,stiffness,and durability of the bridges are reduced,to a great extent which affects the operation safety of the bridges.Therefore,it is necessary to evaluate the technical condition and carrying capacity of those bridges in use.Tak-ing an hollow-type slab arch bridge as an example,a finite element model was established using the finite ele-ment software Midas/civil,and the bearing capacity and technical condition of the slab arch bridges were evaluat-ed in terms of visual inspection and bridge load testing data.The results show that the bearing capacity of thebridge satisfied the requirement of the city A-level bridge load,however the results regarding visual inspectionshow that there are some safety problems in the partial structure of bridges.The evaluation technique presentedin this paper can be used as a reference in analysis and evaluation of the bearing capacity of similar bridges.