Component-based mechanical models for blind-bolted angle connections

This paper deals with the prediction of the monotonic and cyclic response of blind-bolted angle connections between tubular columns and open beams. Firstly, the experimental study used for validation purposes is briefly described with focus on the required connection details and material properties. A mechanical model, based on the component approach, is then proposed and a detailed description of the model assumptions, component characterisation, overall considerations and model validation is presented. The proposed mechanical model is also used to perform a parametric investigation into the key factors influencing the behaviour of blind-bolted angle connections. It is shown that the blind-bolt grade, angle thickness, column face slenderness and gauge distance have a significant influence on the connection behaviour. Based on these findings, simplified approaches for the estimation of the initial stiffness and moment capacity of blind-bolted connections are suggested. Failure mode considerations and simple expressions for ensuring the desired yield mechanism are also discussed. In addition to the detailed component model, this work provides information necessary for the development of practical design procedures for blind-bolted angle connections.