2孔40 m预应力钢-混凝土组合梁结构设计

多孔连续梁因其受力合理,能有效减小建筑高度,故在设计中普遍采用。而2孔连续结构一般因墩顶负弯矩及跨中正弯矩均较大而不予采用。针对预应力钢-混凝土组合梁上跨京秦高速公路的设计实例,从提高其承载能力、刚度,改善受力性能的角度,介绍2跨预应力钢-混凝土组合箱梁的结构设计及施工情况。

2 Ports 40m Prestress Steel Concrete Combined Girder Structure Design

Multi-ports continuous girder is popular in design for its rational stress and effectively building height reduction,but 2 ports continuous steel concrete girders are abandoned because of relatively big negative bending torque on pier top and positive bending torque in the middle of span.Based on the design example of Jinqin Expressway overpass prestress steel concrete girder,this paper introduces structural design for 2 spans pre-stress steel concrete box girder and construction in view of improving its bearing ability,rigidity and load bearing performance.