Parametric Analysis on the Enhancement of Bending Capacity in T-stub Square-Neck Single-Side Bolted Connections

Based on the analysis models and calculation equations of bending bearing capacity of beam-column joints with T-head Square-neck One-side Bolts （TSOBs）， the expanded parameter analysis was carried out through the Finite Element （FE） numerical simulation method to fill the gap of parameters not considered in the experimental studies and verify the reliability and accuracy of the theoretical analysis models. The results showed that： 1） the three-dimensional FE model of the joints established in the paper could not only accurately predict the failure modes， stress state of each component and yield sequence of the joints under monotone loading， but also obtain the bending moment-rotation relation curves with high consistency with the test results； 2） the error between the theoretical calculation values and the FE values of the bending bearing capacity for the joints was basically within 15%， and only the error of some joints was larger， but not more than 40%. In addition， the peak bearing capacity predicted by the theoretical equation was better than the yield one； 3） for the failure modes， 47.1% of the joints were completely predicted accurately， 47.1% were partially predicted successfully， and only 5.8% of the joints were predicted incorrectly. Considering the complex structure of the joints and the simplification of the analysis models of each component，this degree of prediction error for bending bearing capacity and failure mode should be acceptable.