Parametric Study On Multiplanar K-Joints Made of RHS Regarding Axial Force, In-Plane Bending And Out-of-Plane Bending Moments

Herion, S. (University of Karlsruhe) | Mang, F. (University of Karlsruhe)

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ABSTRACT This paper presents the most significant results of a comprehensive parametric study on multiplanar K-joints. In this study, which is part of a Ph.D. work, the influence of axial load, in-plane bending moments (IPB) and out-of-plane bending moments (OPB) are considered separately. For each type of loading, symmetric load vectors have been assumed and the most unfavorable assumption has been investigated. On this basis and in dependence of the geometric parameters ß = b1/b0, τ = t1/t0, 2γ = b1/t0, SNCF diagrams and formulae for the design of multiplanar K-joints with gap made of RHS are given. INTRODUCTION Nearly all the tests concerning the fatigue behaviour of hollow section Joints published in the last few years, have been carried out on uniplanar test specimens. Only few experiments have been carried out m different countries on multiplanar K-joints First fundamental investigations on multiplanar joints made of circular and square hollow sections under fatigue load have been carried out in the Netherlands (Delft University of Technology and INO Building and Construction Research, Rijswijk) and in Germany (Karlsruhe University) sponsored by the ECSC (Puthli, R S, 1988–1991, Mang, F, 1988–1991, Mang, F, 1991a). At the ISOPE "92 conference in San Francisco, the authors reported on the results of this project and made comparisons between uniplanar and multiplanar K-Joints made of rectangular hollow sections (Mang, F, 1992) In a program sponsored by the Deutsche Forschungs-gememschaft (DFG) (Mang, F, 1991 b), these investigations were continued consequently using the Finite Element Method First results of these investigations were published in 1993 in ISOPE-93 (Mang, F, 1993) In addition to this, a Ph.D. work was started (Herion, S, 1994) With the object of developing easy-to-apply parametric formulae and diagrams for the determination of strain concentration factors SNCF (see Fig 1) Part of the results of this work will be presented briefly in the following sections.

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