Abstract
A design shear resistance formula for Y-type perfobond rib shear connectors is proposed with the various reduction factors, which can be selected depending on the target safety level. The nominal shear resistance formula is improved based on the systematic sensitivity analysis as well as the regression fit test based on 84 push-out test results, including 15 additional push-out tests to extend the application ranges and reduce the estimation errors, compared to the formula proposed in previous studies. Some design variables are additionally included in the proposed design formula: the yield strengths of rebar and rib plate. The basic design variables in the proposed design formula are (1) number of ribs and transverse rebars, (2) concrete compressive strength, (3) rebar diameter and yield strength, and (4) rib thickness, width, height, and yield strength. The application ranges of the basic design variables are recommended for the proposed design formula. The various shear resistance reduction factors are proposed based on the probabilistic ultimate shear resistance model of Y-type perfobond rib shear connectors. The proposed procedure may be recommended to develop the design formula for shear connectors with various shapes.
Highlights
Steel and concrete composite structures have various constructional, mechanical, and economic advantages that enable them to be applied to wide range of civil engineering applications
The design shear resistance formula for Y-type perfobond rib shear connectors was proposed with the reduction factor
The nominal shear resistance formula was improved based on the systematic sensitivity analysis and the regression fit test with 84 experimental results
Summary
Steel and concrete composite structures have various constructional, mechanical, and economic advantages that enable them to be applied to wide range of civil engineering applications. Oguejiofor and Hosain [10] suggested a shear resistance formula for a plate perfobond shear connector considering strengths of steel and concrete as well as the rib shape. Ahn et al [11], Candido-Martins et al [12], Zheng et al [13], and Yoshitaka et al [14] have considered the distance between two adjacent plate perfobond shear connectors, geometries of the perfobond rib, and material properties He et al [15] compared the previously proposed shear resistance formulas and suggested a new formula. Based on the push-out tests as well as numerical investigations, a shear resistance formula of the Y-type perfobond rib shear connector has been suggested and improved with additional experimental works by changing the basic design variables, such as rib size, transverse rebar size, concrete strength, etc. Based on the probabilistic characteristics of the new formula, the reduction factors are suggested to be adopted in the design process
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