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将车辆模型视为7自由度的整车模型,混凝土裂缝分为开口裂缝和呼吸裂缝两种类型,建立了多跨变截面损伤混凝土梁的车桥耦合方程并编制了相应的计算程序,且以算例分析结果验证了方法的正确性。对不同裂缝类型、裂缝出现位置、裂缝参数及车辆组合等因素对桥梁冲击系数的影响进行了分析,结果表明:裂缝的存在会使桥梁的冲击系数增大,且开口裂缝所对应的冲击系数要大于呼吸裂缝所对应的冲击系数,裂缝参数、裂缝位置变化及车辆组合等都会对桥梁冲击系数有不同程度的影响。
The vehicle model is regarded as a vehicle model with 7 degrees of freedom. The concrete cracks are divided into two types: open crack and respiratory crack, and the bridge-coupling equations of concrete beams with multi-span cross-section damage are established. Corresponding calculation programs The example analysis results verify the correctness of the method. The influence of different types of cracks, locations of cracks, crack parameters and vehicle combinations on the impact coefficient of the bridge is analyzed. The results show that the existence of cracks will increase the impact coefficient of the bridge, and the impact coefficient of the open cracks should be Impact coefficient greater than the respiratory crack, crack parameters, changes in location of cracks and vehicle combinations will have different degrees of impact on the bridge impact.