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为研究大跨度体外预应力钢-混凝土组合结构桥梁的动力行为,分析推导了钢-混凝土组合结构桥梁的等效阻尼比的计算公式,深入探讨了组合梁剪力连接件群的抗剪刚度及界面滑移、体外预应力作用效应、下部桩-土相互作用对钢-混凝土组合结构桥梁动力特性的影响。有限元计算及结果表明:组合结构桥梁的等效阻尼比对体系的动力响应影响显著;组合梁剪力钉群的抗剪刚度及体外预应力作用水平对大跨度组合结构桥梁的自振频率均有不同程度的影响,但相对较小;桩-土相互作用对大跨度组合结构桥梁的动力特性影响明显。
In order to study the dynamic behavior of long-span external prestressed steel-concrete composite bridges, the formula for calculating the equivalent damping ratio of the composite steel-concrete composite bridges is derived. The shear stiffness of the composite beam- Effect of interface slip, external prestressing effect and lower pile - soil interaction on dynamic characteristics of steel - concrete composite bridge. The results of finite element analysis and the results show that the equivalent damping ratio of the composite bridge has a significant effect on the dynamic response of the system. The shear stiffness and the level of external prestressing force of the composite shear bridge exert a significant influence on the natural frequencies of the long-span composite bridges But it is relatively small. The pile-soil interaction has obvious influence on the dynamic characteristics of long-span composite bridges.