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以某一公路Ⅰ形组合简支板-梁桥为研究背景,研究了单车荷载作用下,各片梁的振动响应及冲击系数。根据I形组合板-梁桥结构特点,结合车辆结构振动特性,将Ⅰ形组合板-梁桥分别离散为三维的板实体模型、梁板模型及梁铰模型,车辆简化为3D整车模型,并考虑桥面不平顺的影响,建立车桥耦合振动方程。分析了不同计算模型对动态响应及冲击系数的影响,并将三种模型的理论计算结果与实测动力特性及冲击系数比较研究。研究结果表明,针对算例中的现浇桥面板的组合板梁桥,不同的计算模型对冲击系数影响显著,认为板实体模型为研究该类组合板梁桥的车桥耦合振动响应最精确的有限元模型。
Taking the I-type composite support-girder bridge of a certain highway as the research background, the vibration response and impact coefficient of each sheet-girder under single-car load are studied. According to the characteristics of the I-shaped composite plate-beam bridge and the vibration characteristics of the vehicle structure, the I-shaped composite plate-beam bridge is discretized into a three-dimensional plate solid model, a beam plate model and a beam hinge model, Considering the influence of the unevenness of the bridge deck, a coupled vibration equation of the bridge is established. The influence of different calculation models on dynamic response and impact coefficient is analyzed. The theoretical calculation results of the three models are compared with the measured dynamic characteristics and impact coefficients. The results show that different calculation models have a significant impact on the impact coefficient for the composite girder bridge with cast-in-situ deck in this study. The physical model of the slab is considered to be the most accurate for studying the coupling vibration response of the composite girder bridge Finite element model.