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原文传递 Behavior of Hollow Structural Section Branch-to-Casting Node Connections for Free-Form Grid Shell Structures

题名：	Behavior of Hollow Structural Section Branch-to-Casting Node Connections for Free-Form Grid Shell Structures
正文语种：	eng
作者：	Kwang-Hee Han;Tae-Sung Eom;Hyeon-Jong Hwang;Jang-Hyun Lee;Sungjin Kim
作者单位：	Dankook Univ.;Dankook Univ.;Konkuk Univ.;WITHWORKS Inc.;WITHWORKS Inc.
关键词：	Connection;Hollow structural section;Axial strength;Local buckling;Node;Casting;Grid shell
摘要：	Abstract Casting nodes are used to connect branch members at joints of freeform grid shell structures. In this study, the structural performance of a rectangular hollow section (RHS) branch-to-casting node connection was investigated. A RHS branch member with an access hole (i.e., opening) for temporary bolting was weld-connected to the T-shaped node fabricated by a conventional casting method. Six RHS branch-to-node connection specimens were tested under tensile and compressive loading. The eccentricity of axial loads was considered as the main test variable. Tests showed that, despite the opening near the weld joint, the RHS branch-to-casting node connections exhibited good performances. For tensile specimens, the ultimate strengths were greater than the yield strengths of the casting nodes, and weld rupture eventually occurred at the stiffener-to-casting node wall joints. On the other hand, for compressive specimens, the ultimate strengths were limited by flexural and torsional buckling modes accompanying local buckling and crippling of the casting node walls. The ultimate strengths degraded by the eccentric loading and openings were evaluated in accordance with current design codes. The failure modes and consequent strengths of compressive specimens were further investigated through finite-element analysis. Based on the investigations, design recommendations of RHS branch-to-casting node connections with openings were given.
出版年：	2022
期刊名称：	Journal of structural engineering
卷：	148
期：	8
页码：	04022095.1-04022095.14