摘要
为了解大件运输车辆荷载对桥梁通行能力的影响,以装配式T梁桥为例,在有限元分析软件MIDAS Civil 2021中采用梁格法建立了T梁桥的空间模型,分析典型大件运输车辆通行时的荷载效应,研究了桥梁跨径、大件运输车辆轴载、轴距等因素对大件运输车辆桥梁通行能力的影响,得出了大件运输车辆通行条件的一般规律。研究发现:T梁桥在大件运输车辆荷载作用下正弯矩的富余度远大于负弯矩和剪力,负弯矩和剪力对车辆轴载和轴距的变化相对更敏感,且大件运输车辆轴载的影响大于轴距。对于技术状况较好的25 m跨径以上的T梁桥,当大件运输车辆类型为所述类型且其轴载与轴距之比小于10时,判断大件运输车辆可以安全通行。
To explore the influence of large transport vehicles on the traffic capacity of bridges,this paper took a prefabricated T-beam bridge as an example and established its spatial model by the grillage analogy method via the finite element software MIDAS Civil 2021 to analyze the loading effects on the traffic of typical large transport vehicles.The impacts of the bridge span,axle load,wheelbase,and other factors of the traffic capacity of large transport vehicles on the bridge are analyzed,and general rules are derived for the access conditions for large transport vehicles.The study results show that under the loading effect of the large transport vehicle,the surplus of positive bending moment of the T-beam bridge is much larger than that of the negative bending moment and shear force,while the negative bending moment and shear force are relatively more sensitive on the vehicle axle load and wheelbase change,with a greater influence of the axle load than the wheelbase.For T-beam bridges with a span over 25 m and good technical condition,when the type of large transport vehicle is the type mentioned in this paper and the ratio of its axle load to wheelbase is less than 10,it is judged that the large transport vehicle can pass the bridge safely.
作者
汪贤安
WANG Xian′an(Shanxi Transportation Technology Research&Development Co.,Ltd.,Taiyuan,Shanxi 030032,China)
出处
《山西交通科技》
2024年第2期106-110,共5页
Shanxi Science & Technology of Transportation
关键词
桥梁工程
大件运输
荷载效应比较法
T梁桥
通行评估
bridge engineering
large transport
loading effect comparison method
T-beam bridge
access evaluation
作者简介
汪贤安(1992—),男,陕西商洛人,工程师,大学本科,主要从事桥涵工程研究工作。
