Strength and Plastic Rotation Capacity of I-Shaped Beams with Grid-Purlin System Subjected to Cyclic Loading
Journal
Journal of Structural Engineering (United States)
Journal Volume
147
Journal Issue
7
Date Issued
2021
Author(s)
Abstract
This paper introduces a grid-purlin system, which was composed of secondary rectangular-hollow-section grids welded onto the top flange of I-shaped beams of moment frames. The welded grid-purlin itself may play a role of a lateral bracing member for the welded beam. However, the ultimate strength, plastic rotation capacity, or other structural characteristics of this grid-purlin system remain poorly understood. This paper presents two full-scale cyclic loading tests on specimens with I-shaped beams 700 mm deep, 240 mm wide, and 13 m long. The diagonal length of grids in the square grid-purlin of the specimen was 1.3 m on-center, and two different depths of the sections were selected for the purlin sections. Both specimens successfully achieved fully plastic moments at a plastic rotation exceeding 0.04 rad. This shows that the grid-purlin system provides reliable lateral bracing. Continuum finite-element (CFE) analysis was performed to simulate the hysteretic experimental response of the grid-purlin system. This CFE model was used to examine the plastic rotation capacity for a variety of combinations of I-shaped beams and grid-purlins. ? 2021 This work is made available under the terms of the Creative Commons Attribution 4.0 International license,.
Subjects
Beam
Cyclic loading test
Plastic rotation capacity
Purlin
Stability bracing of beams
Cyclic loads
Steel beams and girders
Welding
Lateral bracing
Moment frames
Plastic rotation
Rectangular hollow sections
Structural characteristics
Ultimate strength
Rotation
SDGs
Type
journal article