Moment-rotation model of single-web angle connections

The objective of this study is to develop a more accurate model to predict moment-rotation model for single-web angle connections. As the characteristics of connections affect the distribution of inner force and displacement of structure, the effects of connections must be incorporated in the analysis of the structural system. The developed finite element models using ABAQUS software are verified by comparison with previous experiments conducted by others. Several parameters, such as the material properties of angle, length of angle, gage distance, thickness of angle, and number of bolts are investigated in this study. Two different types of moment-rotation relationship, TYPE I and TYPE II, corresponding to different failure modes were established. In TYPE I, the connection angle fails by yielding. In TYPE II, the bolt fails by shear or the bolt hole of connection angle is torn. Failure mode factor was proposed to distinguish them. A simpler inverse hyperbolic sine function model for TYPE I and a hyperbolic tangent function model for TYPE II were developed. These two hyperbolic function models agree well with the various test results.