Determination of shear stiffness for headed-stud shear connectors using energy balance approach

Huawen Ye, Ruosen Huang, Shiqing Tang, Yu Zhou and Jilin Liud

Abstract

The shear stiffness of headed-stud shear connectors has no unified definition due to the nonlinear characteristics of its load-slip relationship. A unified framework was firstly adopted to develop a general expression of shear load-slip equation for headed-stud shear connectors varying in a large parameter range based on both force and energy balance. The pre- and postyield shear stiffness were then determined through bilinear idealization of proposed shear load-slip equation. An updated and carefully selected push-out test database of 157 stud shear connectors, conducting on studs 13~30mm in diameter and on concretes 30~180 MPa in cubic compressive strength, was used for model regression and sensitivity analysis of shear stiffness. An empirical calculation model was also established for the stud shear stiffness. Compared with the previous models through statistical analysis, the proposed model demonstrates a better performance to predict the shear load-slip response and stiffness of the stud shear connectors.

Key Words

energy balance approach; push-out test; shear load-slip relationship; shear stiffness; stud shear connector

Address

Huawen Ye:School of Civil Engineering, Southwest Jiaotong University, Chengdu 610031, China Ruosen Huang:School of Civil Engineering, Southwest Jiaotong University, Chengdu 610031, China Shiqing Tang:School of Civil Engineering, Southwest Jiaotong University, Chengdu 610031, China Yu Zhou:School of Civil Engineering, Southwest Jiaotong University, Chengdu 610031, China Jilin Liud:School of Civil Engineering, Southwest Jiaotong University, Chengdu 610031, China

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