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由于交通量构成及车型比例的不同,桥梁两侧扩建后,汽车荷载在新老桥的分配也不尽相同。该文通过昌樟高速公路改扩建工程药湖特大桥交通量及车型分析,确定新老桥车型与车道划分,并以新建桥20m跨径简支梁为例,考虑不同汽车加载模式,根据其引起的桥梁效应进行计算,并将其与中国已有汽车荷载研究分析成果进行对比分析。结果表明:由于改扩建的特殊性,新老桥承担的车辆荷载及车型不尽相同,实际荷载效应均不同程度地大于当前公路-Ⅰ级的效应值,所以桥梁扩建外侧新建桥梁设计时,应结合交通量及车型比例适当提高汽车荷载的分项系数,保证桥梁结构安全。
Due to the different traffic volumes and the different proportions of vehicles, the distribution of car loads in Xinqiao is not the same even after the expansion of both sides of the bridge. Based on the traffic volume and model analysis of the Lihu Bridge at the Changzhang Expressway Reconstruction and Extension Project, the model and lane division of the new bridge and the old bridge are determined. Taking the 20m span simple supported beam as an example, considering different vehicle loading modes, The bridge effect caused by this calculation is calculated and compared with the existing research results of automobile load in China. The results show that due to the particularity of reconstruction and expansion, the loads and models of vehicles in Xinzhao Bridge are different, and the actual load effects are greater than those of the current highway-Ⅰ in varying degrees. Therefore, when designing new bridges on the outside of the expansion In combination with traffic volume and model proportion, the partial load factor of automobile load should be appropriately increased to ensure the safety of bridge structure.