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进行了八座钢管混凝土拱桥车振动力响应实测,建立了考虑车桥相互作用的有限元计算模型,通过与实测加速度响应进行的比较表明钢管混凝土拱桥车桥振动计算方法的正确性。利用有限元模型,对钢管混凝土拱肋和悬吊桥道系的加速度、速度动力响应和冲击系数进行了对比分析。结果表明:虽然钢管混凝土拱桥的冲击系数可能较大,但是它作为行车舒适性的判断依据并不合适,应采用加速度或速度响应来评价。提出了不同路面平整度下预估中、下承式钢管混凝土拱桥车振动力响应的近似公式,通过实桥分析确认了该公式的可行性。
The vibration response of eight CFST arch bridges was measured and a finite element model considering the interaction between the two axles was established. The comparison between the calculated results and the measured acceleration responses shows the correctness of the calculation method for the vibration of CFST arch bridge. The finite element model was used to analyze the acceleration, velocity dynamic response and impact coefficient of CFST arch bridge and suspension bridge. The results show that although the impact coefficient of CFST arch bridge may be large, it is not suitable as the judgment basis for driving comfort, and should be evaluated by acceleration or velocity response. The approximate formula of the vibration response of the CFST arch bridge under different pavement flatness is proposed. The feasibility of this formula is confirmed by the real bridge analysis.