钢管混凝土格构式高墩连续弯梁桥地震响应及参数分析

Seismic Response and Parameters Analysis of Curved Continuous Beam Bridge with High Piers of Concrete Filled Steel Tubular Laced Column

钢管混凝土格构式高墩连续弯梁桥是强震区高速公路的新兴桥型之一。本文依托四川干海子特大桥实际工程,以梁墩刚度比、曲率半径、缀管布置形式以及有无减隔震装置为设计参数,应用Midas Civil有限元软件构造了26座三跨对称曲线连续梁桥计算模型,对E1地震作用下钢管混凝土组合桁梁和格构墩主要控制截面处的弯矩、扭矩、墩顶位移、位移率等地震响应值进行对比分析,探讨了各设计参数对钢管混凝土格构式高墩连续弯梁桥的影响规律和抗震适用性,给出了建议的参数适用取值范围,并对干海子大桥第一联结构进行了优化验证。该研究结论可为同类桥梁抗震优化设计提供理论支撑,提高结构安全度,同时也为钢管混凝土组合结构桥梁的抗震设计规程修编提供参考和借鉴。

Curved beam bridge with high piers of concrete filled steel tubular（ CFST） laced column is new bridge type for highway in strong earthquake area. Based on the engineering background of Gan Hai Zi super-large bridge,26 finite element models of three span curved continuous bridge are built by universal program of Midas Civil,with different structure design parameters including rigidity ratio of main beam and pier,radius of curvature,arrangement type of lacing tube,and types of supports（ whether or not there is seismic isolation bearing）. The bending moment of beam and pier on main control section, displacement on top section of pier and displacement rate of different bridge models are analyzed,and the influence of structural parameters on seismic performance of curved continuous beam bridge with high piers of CFST laced column and the seismic applicability of these parameters are discussed,then the suggested application range of parameter is provided. Finally the optimization verification of the first joint Gan Hai Zi bridge structure is conducted. The result will provide theoretical guidance for the conceptual seismic design of this kind of bridge,which can also provide reference for the further improvement of seismic design codes of CFST composite structure bridge.