Horizontal Force Distribution Mechanism of the Cable Force in the Cable-Pylon Anchorage Zone with Built-in Anchor Box
The stress analysis of the cable-pylon anchorage zone is usually calculated using solid finite elements.However,due to the complex structure and diverse types,it is not easy for general engineering designers to use.Therefore,this paper analyzed the transmission characteristics of the built-in steel anchor box anchoring system based on the actual project of a cable-stayed bridge and proposed a simplified calculation method based on the plane frame theory.Nonlinear analysis methods were used to establish an ANSYS finite element model of the anchorage zone to correct the formula.The results show that the error between the calculation results of the simplified formula before correction and the finite element model calculation results is about 10%.Considering the influence of the thickness of the pylon wall,the calculation height of the pylon,and the thickness of the anchor box side plate,the method of reducing the elastic modulus of concrete is used to compensate and correct the stress distribution of the bridge pylon,and the specific concrete reduction coefficient is determined by the method of nonlinear regression.Finally,the corrected formula was compared with the finite element model data.The results show that the error between the calculation results of the corrected formula and the finite element model calculation results is within 2%,indicating the corrected formula can well analyze the cable force distribution in the cable-pylon anchorage zone and has a certain practical engineering value.
cable-stayed bridgesteel anchor boxcable-pylon anchorage zonefinite element methodsimplified calculation
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