空间索面斜拉桥钢锚梁受力性能分析

Analysis on Stress Performance of Steel Anchor Beam of Spatial Cable Plane Cable-stayed Bridge

斜拉桥索塔锚固区是承载拉索锚固力的重要结构,也是斜拉桥桥塔设计的关键部位。钢锚梁式索塔锚固构造是一种能够较好发挥钢结构抗拉能力强的索塔锚固结构,但这种锚固形式主要应用于竖直索面布置斜拉桥,在空间索面斜拉桥中的应用于研究较少。为了研究在空间索面作用下钢锚梁结构的受力特点,以某空间索面斜拉桥为依托,通过数值模拟与理论分析的方法对钢锚梁是锚固区的受力特性进行了研究。通过研究可知空间索面拉索对锚梁的横桥向水平分力相对较小,可通过侧向限位装置提供可控的横桥向支撑;锚梁的拉板在老虎口位置应力集中明显,应注意加强该区域的圆顺过渡;混凝土塔壁设计应加强在断索工况下的承载能力检验。

The anchorage zone for cable and pylon of cable-stayed bridge is an important structure bearing the cable anchorage force,and is also a key position in the pylon design of cable-stayed bridge.The steel anchor beam cable-pylon anchoring structure is a structure able to better play the tensile strength of steel structure.But this kind of anchoring form is mainly adopted for the vertical-plane cable-stayed bridge,and few studies have been made on the application of spatial plane cable-stayed bridge.In order to study the stress characteristics of steel anchor beam structure under the action of spatial cable plane,relying on a spatial plane cable-stayed bridge,the stress characteristics of steel anchor beam in anchorage zone are studied by the methods of numerical simulation and theoretical analysis.The study result shows that the horizontal component along bridge of spatial plane cable to the anchor beam is relatively small.The lateral spacing device is used to provide the controllable support along bridge.The stress of anchor beam pull plate is obviously concentrated in the position of tiger mouth.Attention should be paid to strengthening the smooth transition of this zone.The inspection of bearing capacity should be strengthened under the condition of cable breaking in the design of concrete pylon wall.