【摘要】 四川绵茂公路上的东河3号大桥为新型波形钢腹板曲线梁桥。针对该新型桥梁,分别从有限元模型的建立、地震波输入方向的组合、地震动输入主方向的确定以及结构的动力特性和地震反应等几方面进行研究。该桥采用波纹钢腹板箱梁,可有效降低自重,具有较好的抗弯、抗扭刚度,采用墩梁固结可降低墩顶位移、增大桥梁的抗侧刚度,体系较合理;曲线梁桥地震波输入主方向对桥梁的地震反应影响较大;在计算分析时,对波形钢腹板进行合理等效可较准确地分析该类新型桥梁的地震反应,曲线梁桥的扭转振型与直桥相比出现较早且更明显;对于曲率不大的曲线梁桥,地震输入方向的较小变化对各内力的影响不大。更多还原

【Abstract】 The Donghe No.3 Bridge in Sichuan Mianmao Road is a new type of curved girder bridge with corrugated steel webs.The construction of finite element model,the combination of directions about seismic input,the confirmation of main directions about seismic input,dynamic characteristics and seismic response of structure were studied.The bridge is a reasonable system that box girder with corrugated steel webs was used to reduce self weight and provide good bending and torsional stiffness.Consolidating with pier and girder was used to reduce the pier top displacement,and increase the lateral stiffness of the bridge.The main directions of seismic input have remarkable effect on the seismic response of bridge.The seismic response of the new bridge was analyzed accurately through making reasonable equivalent to the girder with corrugated steel webs.Compared with the straight bridge,the torsional vibration mode appeared earlier and more clearly in the curved girder bridge;for the small curvature bridge,it has little effect on the internal force during changing the directions of seismic input.更多还原