About the author:

1. School of Civil Engineering,Shandong Jianzhu University,Jinan, Shandong 250101,China;2. Jinan Engineering Quality and Safety Center,Jinan, Shandong 250102,China

Abstract:

The disk lock support has been widely applied in concrete structure support systems. Inbuilding construction, the arrangement of vertical poles beneath beams often results in the transversespacing of vertical poles failing to meet modulus requirements. The double⁃channel steel support systemenables the elimination of vertical poles under beams, but it suffers from the issues such as heavy self⁃weight and difficulty in installation and dismantling. The disk lock truss beam support system useslightweight truss beams as the main keel for beam bottom formwork, with both ends connected to theadjustable jacking on the vertical poles at the beam sides via coupler connectors, achieving no verticalpoles under beams, light self⁃weight, and convenient installation and dismantling. Based on threeinfluencing factors such as truss beam span, chord member spacing, and compression zone width, thispaper designed 19 truss beam configurations and conducted numerical simulation to investigate the effectsof different factors on the mechanical properties of truss beams. The research results show that the load⁃bearing capacity of truss beams is governed by material strength rather than deformation. The span of thetruss beam is a key factor affecting its load⁃bearing capacity. When the truss beam span increased from1 200mm to 1 800mm, the load⁃bearing capacity decreased by approximately 44.8%. For truss beamswith the same span, increasing the spacing between the upper and lower chord members enhanced theflexural performance. When the chord member spacing increased from 80mm to 110mm, the load⁃bearingcapacity of the truss beams with a span of 1 800mm increased by an average of approximately 14.1%.Variations in the compression zone width mainly affected the magnitude of the uniformly distributed load and had a relatively minor influence on the load⁃bearing capacity of the truss beams.