스테인리스 각형강관 보-기둥의 내력에 관한 연구

Abstract

Stainless steel has a significance in its corrosion resistance, while it has been scarcely used in structural skeletons of building due to high prices. However, in the recent movement of social mind from mass production and abundant consumption to ecological coexistence with natural environment, sustaining a long life of building is of much concern in construction engineering. In that context, stainless steel is expected to be promising material for building. Also stainless steel of easy maintenance and fire resistance efficiency, elongation is superior carbon steel can be used for structural members.

This study is experimental and analytical works on stainless steel tubular sections fabricated by cold-forming. The purpose of the study was to determine the buckling strength of stainless steel structural hollow sections and to develop guidelines for the design of these sections as structural members. It is a series of experimental investigation on the compressed tests on stainless steel tubular columns and beam-columns and beam, including material tests(stub column tests, coupon tests).

The experimental parameters of this study are as follows ; 1. Material tests - A kind of steel : Stainless steel(STK 304 TKC) - Section shape : Rectangular hollow section(□-100×100×3.0) - Width-thickness ratio : b/t - 30 2. Columns test - A kind of steel : Stainless steel(STK 304 TKC) - Section shape : Rectangular hollow section(□-100×100×3.0) - Width-thickness ratio : b/t - 30 - Slenderness ratio() : 30, 50, 70 3. Beam-columns test - A kind of steel : Stainless steel(STK 304 TKC) - Section shape : Rectangular hollow section(□-100×100×3.0) - Width-thickness ratio : b/t - 30 - Slenderness ratio() : 30, 50, 70 - Eccentricity distance(e) : 25㎜, 50㎜, 75㎜, 100㎜ - Curvature : A Single Curvature, A Double Curvature - On the symmetrical end-moment, On the asymmetrical end-moment 4. Beam test - A kind of steel : Stainless steel(STK 304 TKC) - Section shape : Rectangular hollow section(□-100×100×3.0) - Width-thickness ratio : b/t - 30 - Slenderness ratio() : 30, 50, 70

The strength assessment method using theoretical analysis assessed the strength as it maintained a constant axial force on the steel hollow section column and assumed that the steel hollow section was subjected to full plastic stress according to the increase in the load of the moment when the moment was operated. When the axial force and moment were operated, the full plastic stress block of the sectional factor of the stainless steel rectangular hollow section was calculated, by leading the M-P interaction from the equilibrium condition of force according to the location of the neutral axis and considering the effect based on the changes in the slenderness ratio(moment extension coefficient: ). On the evaluation of the maximum strength of the stainless steel square hollow section, the following were assumed: 1. The shape of the section is rectangular hollow section; 2. The stainless steel square hollow section should remain a plane after its strain; 3. Under the full plastic stress condition, the tensile stress and the compressive stress on the section all performed rectangular stress distribution; and 4. For the effects of the sloping of the materials and the eccentric load, the moment expansion coefficient() and the stress reduction coefficient(φ = 0.85) were applied.