Hybrid simulation of steel frames with semi-rigid connections

Hybrid simulation;Bouc-Wen

Bennier, David J. ; Elnashai, Amr S. ; Elnashai ; Amr S.

关键词: Hybrid simulation;    Bouc-Wen;   

Others  :  https://www.ideals.illinois.edu/bitstream/handle/2142/14646/2_Bennier_David.pdf?sequence=5&isAllowed=y

美国|英语

来源: The Illinois Digital Environment for Access to Learning and Scholarship

【 摘 要 】

Fully-welded connections for earthquake resistance of steel frames are costly and theirperformance is adversely affected by weld defects and low-cycle fatigue. An alternative to weldedconnections is the bolted top and seat angle connection. The latter configuration can be designed toexhibit moment capacities that are lower than both the connected beams and columns. Such ‘partialstrength connections’ provide attractive seismic design features by alleviating the overstrengthrequirements that codes impose on column design, to ensure a weak beam-strong-columnperformance. Towards this end, an experimental program was initiated at the University of Illinois, asdescribed below.Full-scale hybrid simulation of a semi-rigid steel frame is conducted and its ductility and driftratios are studied. The experimental component of the simulation comprises a beam-columnsubassembly with top and seat angle with double web angle connection and is instrumented to measuremoment-rotation characteristics, as well as strains on the individual angle plates and slip of bolts. Thesimulation setup and software is described in detail. Simulation results are presented including storydrift and base shear time histories. In addition, the moment-rotation diagrams from the hybridsimulation and cyclic testing are presented. Finally, a phenomenological model based on the Bouc-Wenformulation is fitted to the moment-rotation data. The model is suitable for extensive parametricstudies on the type of connection tested, to guide future large scale testing and to derive designguidance.