Abstract
Abstract Herein is presented a numerical methodology for a static resistance analysis of symmetrically loaded multiplanar KK joints in circular hollow steel sections. This methodology addresses factors related to the simulation of KK joints such as the material properties, the boundary conditions, mesh generation and refinement, incremental load steps and failure criteria. An objective criterion is proposed to identify the two failure modes most often occurring in KK joints. Failure mode 1 is observed when two neighboring diagonal braces loaded in the same sense act as one brace penetrating the chord together. In the failure mode 2, excessive deformation is observed in the chord region between two neighboring braces, folding the chord wall. However, in some cases the failure mode is not easily identified or both failure types are present. The proposed criterion objectively identifies the failure mode. In order to compute the joint resistance, an important failure criterion often adopted in literature for uniplanar K joints is the one known as Lu's deformation. In this paper, a strategy is proposed, which is an extension of Lu's criterion for multiplanar KK joints.
Highlights
Tubular components are commonly employed in structures when their use permits lighter construction or a reduced number of pieces
The design of multiplanar hollow KK joints traditionally follows the guidelines for uniplanar joints, which were developed based on laboratory test results and most recently revised based on Finite Element simulations
Other joints failed in mode 2 (Figure 2b), in which excessive deformation occurs near the transversal gap
Summary
Tubular components are commonly employed in structures when their use permits lighter construction or a reduced number of pieces In infrastructure applications, this typically occurs in long span structures (30-50 m or more) such as stadium roofs, airports, convention centers, bridges, telecommunication towers, and offshore equipment. This paper presents a numerical methodology for the static resistance analysis of symmetrically loaded multiplanar KK joints in circular hollow steel sections. This numerical model was applied to a parametric study of KK joints, comparing their joint resistance to those of their equivalent K joints. The element types examined included quadrilateral and triangular nonlinear SHELL181 elements for describing the tubes and quadrilateral and triangular linear SHELL63 elements for the plates at the chord extremities that defined the chord boundary conditions
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