FINITE ELEMENT 3-D MODELLING OF SEMI RIGID STEEL BEAM-TO-COLUMN CONNECTIONS WITH TOP-AND-SEAT AND DOUBLE WEB ANGLES

Semi rigid beam to column connections are pivotal in shaping the behavior and efficacy of steel structures.Their inherent flexibility significantly impacts load transmission mechanisms, structural responses and internal force redistributions.Widely applied in steel structures enduring substantial loads, especially in towering structures, bridges and industrial complexes. These connections fall into two primary categories: moment-resisting and shear connections. Moment-resisting connections are precisely constructed to convey bending moments between members, enabling controlled rotation. These joints typically join bolts, welds and plates to form a linkage proficient in transferring moments among the interconnected members. Conversely, shear connections are devised to relay shear forces between members while accommodating rotational motion, predominantly relying on bolts or welds for shear force transmission.Partially restrained steel beam to column connections are engineered to permit rotational movement between the beam and column while upholding a degree of stiffness and strength.Analytical investigations employ nonlinear finite element modeling techniques through software like ABAQUS, encompassing geometric and material nonlinearities. ABAQUS capabilities are harnessed to replicate bolt pretension and precisely simulate interactions among angles, columns, beams and bolts. Validation of finite element model outcomes closely corresponds with experimental and analytical findings.This study aims to validate the usage of angle cleats instead of extended end plates and analyze the impact of various parameters on the stiffness of semi-rigid connections via moment-rotation curves.It offers recommendations focusing on an exhaustive exploration of semi rigid beam to column steel connections with angles through finite element modeling to comprehend their behavior under diverse loads, considering connection stiffness and geometry.