PARAMETRIC STUDY OF CURLING PHENOMENON ON BOLTED GROUP SINGLE LAP JOINT CONNECTION

• Main Author: Edward, Andreas
• Format: Final Project
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/57097
• Institution: Institut Teknologi Bandung

Bolted lap-joint connection is frequently avoided because it is known to have eccentricity as it distribute forces. As a result, flexural moment arise at the plate. On a single bolt lap connection with relatively thin plate, curling is an almost inevitable phenomenon. Beside eccentricity, there is a compressive force toward the bolt hole at a curled plate. In steel structures, compression is closely related to buckling which is caused by a slender geometry. In accordance to lap-joint connection, curling could make the connection work ineffectively. Although by thickening the plate curling could be reduced, but changing bolts configuration only without thickening the plate become a better alternative from the economic standpoint. This study is intended to learn what parameters that affect curling on bolted group single lap-joint connection. The hypothesis is because of buckling is involved in curling, so by changing the unstiffened part of the plate, curling should be affected. Therefore two parameters will be observed, namely longitudinal and transverse edge distance. The relationship between these parameters are predicted to be directly proportional, that is reducing the edge distance would cause a decrease in curling. The second hypothesis is because of the distribution of bolts longitudinally that cause couple moment, changing bolt spacing longitudinally would affect curling. The relationship should be inversely proportional, that is reducing the bolt spacing would exacerbate curling phenomenon. So there are three parameters that are studied, specifically longitudinal edge distance, transverse edge distance, and longitudinal bolt spacing. To determine the relationship of each parameter to curling, there will be 27 connection models. Modelling will be conducted in finite element software, ABAQUS. Each model will be loaded by displacement in axial direction u1. Displacement in out of plane direction u3 are then analyzed to determine how connection geometry influences curling phenomenon on bolted single lap-joint connection. The result is that the relation of each three parameters corresponds with the proposed hypothesis. Even though modification in edge distance longitudinally and transversely show a positive influence, but these parameters still couldn’t prevent curling on the plate edge. Therefore there is no one parameter that could make curling disappear.