钢—混凝土混合结构在大跨度连续刚构桥中的应用  

Using Steel-Concrete Hybrid Structure in Long-Span Continuous Rigid Frame Bridge

作　　者：卫星[1] 李小珍[1] 李俊[1] 强士中[1] 

机构地区：[1]西南交通大学土木工程学院,四川成都610031

出　　处：《中国铁道科学》2007年第5期43-46,共4页China Railway Science

基　　金：西部交通建设科技项目(200431822317)

摘　　要：重庆石板坡公路长江大桥采用填充混凝土后板式钢—混凝土接头。在轴力、弯矩和剪力的作用下,钢—混凝土接头处将产生轴向压应力、拉应力和剪应力。压应力由承压板及PBL剪力键共同传递,拉应力、剪应力主要由PBL剪力键传递。计算得到钢—混凝土接头的最不利荷载组合内力。在钢—混凝土接头附近截取18m长的1个梁段,将混凝土与贯穿钢筋进行耦合、贯穿钢筋与PBL板进行耦合,采用实体单元、板单元和梁单元,建立钢—混凝土接头有限元模型,利用有限元软件ANSYS进行仿真分析,得到钢—混凝土接头各部分的应力分布。结果表明:结构各构件在设计荷载下并未出现超出材料强度的应力峰值;剪力主要靠腹板上的PBL剪力键传递;有效的预应力体系是钢—混凝土接头可靠性的根本保证。Steel-concrete joint in backboard form is used in Yangtze River highway bridge at Shibanpo in Chongqing. Under axial force, moment and shear force steel-concrete joint subjected to compressive stress, tensile stress and shear stress. Compressive stress is transferred by carrying plate and PBL （Perfo- Bond Leisten） shear connectors. Tensile stress and shear stress are transferred by PBL shear connectors. The internal forces of steel-concrete joint were computed as a result of the most unfavorable combination of loads. With displacement coupling between concrete and steel bar and between PBL shear connectors and steel bar, finite element model of steel-concrete joint which is 18 m in length was founded by using solid element, plate element and beam element. By using ANSYS, elastic-plastic analysis of steel-concrete joint was performed and stress distributing condition of steel-concrete joint was obtained. FEM results show that PBL shear connectors carry main shear forces between steel girder and concrete girder and structural reliability of steel-concrete joint depends on the effective prestressed system in steel-concrete joint.

关 键 词：钢-混凝土接头 PBL剪力键 连续刚构 混合梁 

分 类 号：U448.23[建筑科学—桥梁与隧道工程]