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以某大型钢管混凝土拱桥为对象,采用经动力试验验证的自编车桥耦合振动分析程序,进行了多组随机不平度样本下的车桥动力响应分析。根据分析结果,对不同桥面状况和车速条件下桥梁的动力冲击效应进行了统计分析。分析结果表明:车速、不平度等级确定时冲击系数服从正态分布。桥面状况等级对动力冲击效应的均值和均方差影响明显,不同保证率下车辆冲击系数差异较大。根据桥梁重要性等级,按照统计分析方法确定冲击系数,将有效提高车辆冲击系数取值的合理性和科学性。
Taking a large-diameter concrete-filled steel tube arch bridge as an example, a self-programmed coupling vibration analysis program verified by dynamic test was used to analyze the dynamic response of the bridge under multiple random irregularities. According to the results of the analysis, the dynamic impact of bridge under different deck conditions and vehicle speed is statistically analyzed. The analysis results show that the impact coefficient obeys the normal distribution when the vehicle speed and the roughness are determined. The effect of bridge grade status on the mean value and mean square deviation of dynamic impact is obvious, and the impact coefficient of vehicles under different guarantee rates is quite different. According to the bridge importance level, according to the statistical analysis method to determine the impact coefficient, will effectively improve the value of the vehicle impact coefficient reasonable and scientific.