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首次提出钢锚板式钢-混组合新型索塔锚固体系,并成功应用于青岛海湾大桥红岛航道桥。采用精细化弹塑性有限元数值分析方法对钢锚板式钢-混组合索塔锚固体系在对称索力作用下力的传递机理进行了研究,分析了对称索力作用下力的传递途径与各构件所承担水平力和竖向力的大小,同时分析了不同位置PBL剪力键传递水平力和竖向力大小的变化规律。结果表明:斜拉索水平分力的85%由钢锚板承担,15%的水平分力通过PBL剪力键和钢-混凝土间的摩擦力传递给混凝土塔柱;斜拉索竖向分力通过横隔板、底座、PBL剪力键以及钢-混凝土间的摩擦力传递给混凝土塔柱,其中上横隔板传递44%的竖向力,下横隔板传递15%的竖向力,底座传递38%的竖向力,PBL剪力键传递2.2%的竖向力,钢-混凝土间摩擦传递0.8%的竖向力。
It is the first time to propose a steel-anchor composite steel-pylon anchoring system and successfully applied to Hongdao Channel Bridge of Qingdao Bay Bridge. The transmission mechanism of the force in the anchor-steel-composite composite pylon anchoring system under the action of symmetrical cable force was studied by means of the refined elasto-plastic finite element numerical analysis method. The transmission of force and the influence of each component At the same time, the change rules of horizontal force and vertical force transmitted by PBL shear keys in different positions are analyzed. The results show that 85% of the horizontal component of the stay cable is borne by the anchor plate, and 15% of the horizontal component force is transmitted to the concrete tower column through the PBL shear bond and the friction between steel and concrete. The vertical component of the stay cable Through the diaphragm, pedestal, PBL shear and steel-concrete friction between the transmission to the concrete tower, in which the upper diaphragm transfer 44% of the vertical force, the lower diaphragm to pass 15% of the vertical force, The base transmits 38% of the vertical force, the PBL shear key transmits 2.2% of the vertical force, and the steel-concrete friction transmits 0.8% of the vertical force.