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Theory Analysis and Model Test Research on the Mechanical Behavior of Steel-Concrete Composite Cable-Pylon Anchorage System with Steel Anchor Slab

Author: ZhangZuo
Tutor: ZhouXuHong
School: Chang'an University
Course: Bridge and Tunnel Engineering
Keywords: steel-concrete composite anchorage system with steel anchor slab PBL shearconnectors full scale test elastic-plastic finite element method load-transfer mechanism limit load-bearing capacity parameter analysis design method
CLC: U441
Type: PhD thesis
Year: 2013
Downloads: 25
Quote: 0
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Abstract


Based on the Hongdao Channel Bridge of Qingdao Jiaozhouwan Bridge and supported byShandong provincial transportation science-technology project of Research on the New Typeof Cable-pylon Anchorage System of Cable-stayed Bridge(2009Y24-2), steel-concretecomposite anchorage system with steel anchor slab was introduced domestically and overseasin this paper creatively. On the basis of collecting structural form and research data ofdifferent types of steel-concrete composite anchorage system, the load-transfer mechanism,load-bearing capacity and design method of this new cable-pylon anchorage system werestudied through the approaches of theoretical analysis and full-scale test.Elastic-plastic finite element numerical analysis was adopted to research load-transfermechanism of the anchorage system under symmetrical and unilateral cable force. Thenumerical simulation with a refined finite element model took the nonlinear contact andfriction between steel slab and concrete and the effect of the reinforcement into consideration.Through this research the load-transfer path of stayed-cable force and the horizontal andvertical force supported by steel anchor slab, diaphragms, vertical diaphragm, base plate,lateral plate, concrete and PBL shear connectors under symmetrical and unilateral cable forcewere found out. Besides, the transferring patterns of horizontal and vertical force of PBLshear connectors in different locations and the effective length of perforated steel wereobtained.The full scale test of steel-concrete composite anchorage system with steel anchor slabadopting the loading method which was the same as the loading method of real bridge wascarried out. The loading operating mode of the test included the cable force of finished bridgestate, operation state, overload state and partial loading state. The structure did not reach itslimit load-bearing capacity under the maximum cable force of the overload state(symmetricalloading) and partial loading state (unilateral loading)which were2.2times as large as thecable force of finished bridge state. It indicates that the anchorage system existed with ahigher safety stock. The test of the stress and displacement of steel anchor slab, the stress ofconcrete and perforated rebar under different loading operating mode were carried out. Bycomparing the results of the test and the numerical analysis, the result demonstrates that theresult obtained from the numerical simulation method adopted by this paper reflects the realstress state of the structure.The limit load and failure mode under symmetrical and unilateral cable force wereobtained by the elastic-plastic finite element analysis of limit load-bearing capacity of thisanchorage system. The deformation and stress of the anchorage system and the pattern ofcrack propagation in concrete were also get.The influence on the stress performance of steel-concrete composite anchorage systemwith steel anchor slab produced by the variation of the thickness of anchor slab, the thicknessand location of diaphragms, the thickness of vertical diaphragm and lateral plate, the numberof columns of PBL shear connectors and diameter of the perforated steel was studied. Theresult shows that the thickness of anchor slab and the number of columns of PBL shearconnectors have the most effect on the stress of every component of the anchorage system aswell as the proportion of the horizontal and vertical force supported by them. And theanchorage system is more sensitive to the variation of the thickness of steel anchor slab. Based on the research above, the construction of steel-concrete composite anchoragesystem with steel anchor slab was optimized. Numerical analysis of the optimized anchoragesystem was carried out to study the working condition and load-transfer mechanism. Theresult demonstrates that the optimized anchorage system is safety under design load, and theload transfer is more limpid, the load transferred by PBL shear connectors increasessignificantly. the design method of optimized steel-concrete composite anchorage system withsteel anchor slab were put forward. By studying the main factors that influenced theload-bearing capacity of PBL shear connectors, the calculation formula of the load-bearingcapacity of PBL shear connectors in the anchorage system was proposed. Simplifiedcalculation method of the contact stress of the pin hinge located in the wing slab was alsodeduced on the basis of the elastic theory, which could be applied to the design of thethickness of steel anchor slab.

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CLC: > Transportation > Road transport > Bridges and Culverts > Structural principles, structural mechanics
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