The Overall Stability Analysis Of The Corrugated Web H-beam Axial Compression Members

Corrugated web H-shaped steel consist of corrugated webs and flat flange webs welded by high frequency welding.Compared corrugated web H-shaped steel with conventional plane web,the corrugated web H-shaped steel possess higher out-of-plane bending stiffness and stability because of the corrugated webs,thus the corrugated can be higher and thinner.Otherwise,the corrugated web H-shaped steel can be applied to large-span spatial structures and the civil architecture with artistic requirements in our country.As for the axial compression members,the members can not bear the axial pressure because of the corrugated webs,but bending stiffness in the other axis has been greatly improved.Corrugated web H-shaped steel has a great significance for saving resources and reducing construction cost.However,analysis and researches on corrugated web H-shaped steel columns are not development enough currently.Therefore it largely restricts the use of corrugated H-shaped steel in the civil engineering.Based on the current researchers' results,the paper fouses on the global stability of steel columns with corrugated webs by using finite element method and theoretic analysis.Based on the previous resesrches of the design codes,some design suggestions for overall stability of the axial compression of the corrugated H-shaped steel are summarized.Firstly,a simplified model of the columns is proposed for the slenderness ratio of the corrugated web H-shaped steel.The model can be sued to analysis the slenderness ratio.The similar of the built-up steel columns with batten plate and the corrugated web H-shaped steel columns can be used to get the slenderness ratio.The model which is propose by finite element can verify the applicability of the derived formula.Secondly,the corrugated web H-shaped steel collumuns' buckling analysis under the centric axial pressure was researched when corrugated web form,member slenderness rations,ratio of amplitude to wav-elength,height-width ratio of the web and width-thickness of the flange changed.Considered the effects of the geometrical and material nonlinearity,the ultimate carrying capacity of the corrugated web H-shaped steel columns is studies.A research was carried out mainly as following:(1)A simplified model is established for the research of corrugated web H-shped steel under the axial compression;(2)Slenderness ratio of corrugated web H-shaped steel has been derived and verified,so it can be safer in the civil engineering;(3)The bearing capacity of the corrugated web H-shaped steel decreases with the increase of slenderness ratio;(4)As the axial compression members,different forms of corrugated web H-shaped steel can be equivalent to each other,because the shape of the fourth part of the axial compression member has little influence on the bearing capacity of the members;(5)The flange depth-width ratio of corrugated web H-shaped steel is suggested to be 10?30;(6)The limit ratio of height to thicknessof web of corrugated web H-shaped steel is 425;(7)The influence of Amplitude to wavelength ratio of corrugated web H-shaped steel can be ignored;(8)Considered the effects of the geometrical and material nonlinearity,the ultimate carrying capacity of the corrugated web H-shaped steel columns is studies.(9)The ultimate bearing capacity of H-shaped steel and H-shaped with corrugated webs has been comparatively analysised,then the formula of reduction coefficient has been got by linear fitting in the scope of GB50017-2003.The conclusion in this paper fulfills the design and calculation theories for the sinusoidal web steel structures and provides references for the further modification of Technical Specification for Sinusoidal Web Steel Structures CECS290-2011.