Abstract
To satisfy the accelerated assembly construction requirements of precast steel-concrete composite bridges, a novel demountable perforated steel-tube shear connector is proposed. Push-out tests using different parameters, including the wall thickness of the steel tube and height and width of the steel strips in a perforated plate, were carried out to investigate the shear strength, shear stiffness, failure modes, and relative slip characteristics of demountable perforated square steel-tube shear connectors. By considering the ideal elastic-plastic properties of steel, the plastic deformation model of the concrete, and the nonlinear contact behavior between the steel and concrete interface, an efficient finite-element (FE) model for a demountable shear-connector analysis was established and validated by the test results. A comparison of the shear performance between a square and a circular steel tube connector with the same thickness, perforated shape, and steel weight was conducted using the verified FE models. The experimental and FE analytical results demonstrate that the demountable perforated steel-tube shear connectors possessed not only the equivalent shear strength of perforated rib connectors but also better ductility than the welded stud connectors. The shear strength and stiffness can be improved by increasing the wall thickness of the steel tube. The perforated shape slightly affected the shear stiffness but largely affected the shear strength. The square and circular steel-tube connectors have almost the same shear-yield strength. However, the square steel-tube connector has higher ultimate shear strength, whereas the circular steel-tube connector exhibits better ductility. The calculation formula of the shear-yield strength of the novel demountable perforated steel-tube connectors was provided based on the plastic-analysis principle. Its accuracy and effectiveness were proven by the agreement of the calculation, test, and FE analytical results. Finally, under an applied load, concrete slabs are considered to do not crack or crush, and the demountable connectors can transform into a plastic state. Therefore, the concrete slabs and steel beams can be easily replaced, repaired, or reused.
| Translated title of the contribution | Shear Performance of a Novel Demountable Perforated Steel-tube Connector |
|---|---|
| Original language | Chinese |
| Pages (from-to) | 28-36 |
| Number of pages | 9 |
| Journal | Zhongguo Gonglu Xuebao/China Journal of Highway and Transport |
| Volume | 31 |
| Issue number | 12 |
| Publication status | Published - 20 Dec 2018 |
Keywords
- Bridge engineering
- Demountable connector
- Push-out test
- Shear performance
ASJC Scopus subject areas
- Civil and Structural Engineering
- Transportation
- Mechanical Engineering