Full-scale Model Test Study On The Behavior Of Cable-beam Anchorage Zone With Tensile Anchor Plate Structure Of A Cable-stayed Bridge

In recent years, with large-scale construction of transport infrastructure, theconstruction of large-span cable-stayed bridge has been rapid development. Theenormous eable force of cable-stayed bridge fixs on cable-beam anchorage structure,the safety of the cable-beam anchorage zone is the key to safety of the whole bridge.The cable-beam anchorage structure of cable-stayed bridge is put forward a higherrequest.Currently, the main cable-beam anchorage forms of cable-stayed bridge are theanchor-box, ear-plate, anchor-pipe and tensile anchor plate. The tensile anchor plate hasunique advantages, such as simple structure, easy processing and easy maintenance.However, The cable-beam anchorage zone of cable-stayed bridge, which bear giantcable forces and have complicated structure, may occur the zone of plasticity under thedesign load. The fatigue problem which was caused by vehicle dynamic load is alsomore prominent. Only through simulation of space finite element, it is difficult to graspthe actual force status of anchor point accurately. Therefore, it is very essential tounderstand the transfer mechanism and fatigue reliability of the cable-beam anchoragezone by the full-scale model test. Combining engineering example, full scale static loadmodel test and fatigue test of the cable-beam anchorage zone with tensile anchor platestructure of a cable-stayed bridge have been carried out. The main contents andconclusions were shown as follows:1. The test study of cable-girder anchorage structure in domestic and foreign wereintroduced. The cable-beam anchorage zone with tensile anchor plate structure wereanalyzed. The transfer mechanism of common cable-beam anchorage structures wereintroduced.2. Through the finite element simulation analysis of the whole structure, theanchorage zones which correspond to largest cable force under design conditions wasselected to study. Local finite element model of the selected anchorage structure wereestablished to study stress distribution and optimize design size of test model.3. To study actual performance of tensile anchor plate and steel-box girder underthe design load, the full-scale model test of cable-beam anchorage zones was conducted.Combining test and simulation analysis, the mechanical properties of each componentof anchorage zones were studyed furtherly, while to examine overload capability andsecurity of the structure.4. According to fatigue load model of domestic and foreign specification, thefatigue loads of anchorage structural was determined on fatigue tests. The constantamplitude fatigue test of the cable-beam anchorage zone with tensile anchor platestructure was conducted to assess fatigue resistance.5. The full-scale model tests of the cable-beam anchorage zone with tensile anchor plate were summarized. Three kinds of cable-beam anchorage structure were simulatedby ABAQUS, which were anchor-box, ear-plate and anchor-pipe. Transfer mechanism,stress distribution and stress concentration were contrasted on the four kinds of cable-beam anchorage structures by theoretical analysis.The contents and conclusions of this paper can provide a reference for futurerelated design with the cable-beam anchorage zone with tensile anchor plate structure.