The Overall Stability Analysis Of Heavy Steel Truss In Industrial Building

Until recently, there has been a relative widespread application of heavy steel truss in engineering. However, overall stability theory for plane steel truss has not been fully studied by scholars at home and abroad, and overall desigen method has not been estabilished. This paper studies the out-of-plane elastic-plastic stability theory of plane heavy steel truss thoroughly by numerical simulation, and therefore design methods of overall stability bearing capacity and lateral support force for plane truss are presented.Usually, out-of-plane stiffness of plane steel truss is much less than its in-plane stiffness due to its properties. The overall stability of steel truss is studied by finite element numerical simulation analysis with ABAQUS when out-plane slenderness ratio for upper chord is different, and influences of depth-span ratio and sectional area of chords on stability are also considered. According to results of finite element numerical simulation, the formula of overall stability coefficient for steel trusses is proposed.The effects of steel strength, sectional areas of upper and lower chords, load position and depth-span ratio on overall stability of steel truss are studie and they are reflected further in the stability coefficient formula by four paramenters. The perfect formula can be used for the overall stability design of plane heavy steel trusses.The effects of different distribution pattern of initial geometric imperfection on lateral support force of steel truss were examined and the most detrimental geometric imperfection distribution resulting in the biggest lateral support force is obtained. Furthermore, the effects of sectional area of chords, depth-span ratio and amplitude of initial geometric imperfection on lateral support force were investigated. Eventually, the suggestive value for the design of lateral support force of steel truss is provided.