Hysteretic Behavior Simulation of HighStrength Steel Flush EndPlate Connection

Abstract:

In order to meet the requirements of fine and simplified hysteretic behavior simulation analysis of highstrength steel flush endplate connection, simulation methods based on solid element and zeroLength element were studied. Based on the solid element, implicit analysis and explicit analysis were conducted. The implicit analysis suffered from inability to converge. In the explicit analysis model, the rule of loading step was improved, and for each amplitude an independent loading step is assigned to minimize large discrepancy occurred in a single step with different amplitudes. Aimed at the zeroLength element, a modified quadrilinear line model was proposed. Two factors, i.e. the bending deformation of the bolts and the rotation of the beam flanges, which cannot be neglected for the highstrength steel flush endplate connection, were considered. The damage indices of the highstrength steel connection and the normal steel connection were different for the unloading stiffness and a simplified model based on the Pinching4 Model was established. The numerical simulation of the flushend plate connection shows that the simplified analysis model can well simulate the slip effect and the pinching effect in the experimental hysteresis behavior.

Key words:pinching effect in the experimental hysteresis behavior. Key words： flush endplate connection; highstrength steel; explicit analysis; modified quadrilinear model; simplified mode