Abstract
To investigate the load transfer mechanism of the steel‐concrete hybrid pylon joint with cells and bearing plates, a theoretical model based on the continuous elastic interlayer method was established. Both the slip effect at the steel‐concrete interface and the local compression effect of the bearing plate were considered in the proposed theoretical model. A segment model test with a 1 : 3 scale was carried out to obtain the strain distribution of the hybrid joint and the relative slip between steel and concrete components. Finite element analysis was implemented on the tested segment model, and the structural performance of the tested hybrid joint was compared with the FEA results. The test and analysis results show that the stress of steel and concrete components is at a lower level, and the relative slip between steel and concrete components is extremely limited. The bearing plates and shear connectors are the two load‐transferring components and could transfer 40% and 60% of the vertical force into the lower concrete pylon, respectively. The vertical force of shear connectors is at a much lower magnitude within 0.6 times the length of the hybrid joint from the bearing plate and will increase gradually within 0.6 to 1.0 times the length of the hybrid joint. The FEA results are in good agreement with the model test results, and the maximum shear force difference between the theoretical analysis results and the FEA results is less than 10%, proving that the proposed theoretical model can reasonably predict the shear force distribution at the steel‐concrete interface of the hybrid joint. In addition, the stiffness of shear connectors has limited effect on the shear force distribution at the steel‐concrete interface.
Highlights
Steel and concrete have been the two most practical and prevailing building materials in the construction of bridge infrastructures for many decades
There are four types of bridge components according to the arrangement of these two construction materials, including steel components, concrete components, steel-concrete composite components, and steel-concrete hybrid components. e composite component is an effective connection of the steel member and the concrete member in the cross-sectional level, while the hybrid component is a reasonable combination of the steel member and the concrete member along the longitudinal direction of the component [1–3]
It can be concluded that the vertical deformation of the steel structure and the concrete structure accords with each other, and the hybrid joint has sufficient shear stiffness for transferring the axial load from the steel structure to the concrete structure
Summary
Steel and concrete have been the two most practical and prevailing building materials in the construction of bridge infrastructures for many decades. E combination of the upper steel pylon and the lower concrete pylon is the joint of the steelconcrete hybrid pylon, and its load transfer mechanism is the study objective of this paper. Many studies have been conducted to investigate the performance of steel-concrete hybrid structures especially for hybrid girders. Kim et al [9, 10] conducted three tests on small-scale steel-PSC hybrid beams to determine and to propose the suitable joint for spliced hybrid I-girder bridges. In the steel-concrete joint of hybrid girders, perfobond rib (PBL) connectors have become another effective load transfer component owing to their superior mechanical performance, convenient construction, and extended service life. A series of studies were implemented to examine the shear performance and load transfer mechanism of PBL connectors especially employed in the hybrid girder of cable-stayed bridges [11–17]. A theoretical model for exploring the load transfer mechanism in the steel-concrete connecting part of the hybrid pylon is introduced firstly. en, a scaled model of the connecting part, taken the hybrid pylon of Jishui Gan River Second Bridge as the prototype structure, was fabricated and tested. e load-sharing ratio by the bearing plate and the shear connector was measured, and the load transfer mechanism in the connecting part of the hybrid pylon was analyzed
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