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Impact factor complex for long-span bridge type is still in the exploratory stage , especially for rigid frame - less continuous beam combination system bridge impact coefficient . Most of the Chinese and foreign scholars on the impact factor analysis of the impact is limited to a single factor . \Therefore, the study Rigid Frame - continuous beam combination system impact factor has important theoretical significance and practical value . Shaanxi , a rigid frame - continuous beam combination system is based on the project , the establishment of a cross- 4 to 6 cross the pier feet consolidation and pile soil interaction six major bridges analysis model , consider the 3-axis suspension spring vehicle model by positive cross - test analysis , its launched a study of the impact coefficient of sensitivity parameters . Divided into 24 kinds of conditions , consider Axle frequency ratio , pavement roughness , 9 impact of body mass , the bridge spans , traffic speed , vehicle travel ways , bridges, stiffness , vehicle damping ratio and lower structure calculation model factors , the the affect bridge main beam control height deflection , bending moment and the main pier to control cross-section horizontal displacement , the moment of impact coefficient sensitivity parameters and the maximum combination of parameters . On this basis , the calculation of the maximum parameter combination of conditions analysis , draw bridge maximum impact coefficient envelope curve given Rigid Frame - continuous beam combination system impact coefficient range . The analysis indicates that the vehicle speed , the frequency and the deck of the bridge structure roughness are the main factors of the coefficient of impact of such a bridge . To pavement roughness breakdown of standards , speed and bridges frequency as the independent variable , regression analysis , for the first time given a rigid frame for the three road grades of A, B, C - continuous beam combined system of the main beam and the main pier the impact factor the approximate calculation formulas , and comparative analysis of the formula with countries norms . Reference of its research findings available for the design of such bridges , and also provide a reference for other bridge dynamic characteristics analysis .
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