Analysis and test research on mechanical performance for steel-concrete composite anchor structure of cable-stayed bridge pylon

Full-scale model test on steel-concrete composite anchor structure for pylon of sutong bridge was done by a self-balanced loading reaction frame to observe the stress,crack distribution and deformation of the model.Also numerical simulation was conducted by the finite element software ANSYS.The results of analysis and test show that cracks most easily occur on concrete surface at upperpart of cable anchor duct export.The steel-concrete contacting surface undertakes mutual action of bending moment and shear.Most horizontal component of pushing load is balanced by steel anchor box and only a small part by concrete,while vertical component of pushing load is all transferred to concrete by shear studs.Since numerical simulation data from single segment model test is larger than that from multi-segmental model test,it's conservative to adopt single segment mode test data instead of actual bridge stress status.