Study On Mechanical Performance Of The Tilt-Preloading Type Steel-Concrete Combining Section

As one of the most important structure nodes in combination tower bridges, the steel-concrete combining section connects tilt steel tower and reinforced concrete pier, of which the design rationality directly influences the safety and service performance of the main tower and bridge structure. So it is very important to study the mechanical performance of the steel-concrete combining section with sloping angle.In this paper, the finite element simulation analysis was performed for the full-scale model with large general software ANSYS on the basis of the tilt-preloading type steel-concrete combining section. Based on the model above, the security of actual steel-concrete combining section was verified under the worst-case load combination by the finite element simulation and theoretical analysis, then the parametrical analysis of the mechanical performance was performed, and optimized design scheme were proposed for the steel-concrete combining section at last.Analysis results show that:1. Under the use of loads, the preloading type steel-concrete combining section makes the structure from traditional passive stress to active force, which avoids generation of tensile stress on concrete joint surface and concrete crack.2. Under the 1.2 times maximum axial force effect combination and maximum bending moment effect combination, steel-concrete combining section do not appear any abnormalities, and the stress of steel-concrete components comply with the design requirements, so the steel-concrete combining section has adequate security reserves.3. There are no significant helpful for the high stress level in steel structure to transfer and disperse into the concrete with the low stress level by increasing the preload of high strength bolt, but increased the security reserve capacity.4. It is efficient to decrease the transverse deformation and main tensile and compressive stress by increasing the stirrup ratio of concrete structure, thickening the bearing plate, increasing the number of the rib stiffener. They are also helpful for the high stress level in steel structure to transfer and disperse into the concrete with the low stress level.