Experimental analysis of the truss-to-column connection in a modularized prefabricated steel structure

Abstract

This paper presents an experimental study on a new truss-to-column connection suitable for a prefabricated steel structure. In this connection, two trusses from adjacent modularized truss mainboards are jointed to the H-shaped column's weak axis by high-strength bolts. The static performance of the connection is studied using symmetrical loading tests of three full-scale specimens. The experimental results demonstrate the evolution of stiffness, capacity, and failure mechanism of each specimen. Then, constructional details of the connection are discussed, and the weakest elements of the connection are pointed out. The multi-plate structural configuration and the associated welding organization are prominent issues for connection. The size and installation of the backing plate have a significant impact on the performance of the joint. Differences in backing plate installation are considered in the two groups of specimens. Combined with the finite element method and experimental results, the correction coefficients of the top chord joint and the bottom chord joint are proposed respectively. Improved theoretical formulas are derived for this new connection. Compared with the experimental results and numerical results, the theoretical values show that the analytical model can provide a good prediction of the flexural capacity of the connection and can provide an acceptable rotational stiffness. Finally, some specific suggestions are put forward to guide engineering practice.