Calculation Of Second-Order Effect On Light Steel Frame With Light Panels Considering Vertical Load

Based on summarizing all kinds of design theories of second-order effect about light steel frames , this article calculates structural member's load-deformation curves when carrying horizontal load , and the results show they are different to those considering initial deflection or initial corner ;and gets the influential coefficients of one-story frame which bottom connection is rigid or flexible when the frame carries vertical load , and those coefficients can be used according to different beam-column linear stiffness ration.According to the seismic code's specification that does not consider second-order effect formula for frame structure, this article also derives the minimum load formula of those second-order effect approximate calculation methods, at the same time unifies magnified coefficient formula of second-order elastic method, load-deformation formula and the formula of inner load-deformation ;and improves second-order elastic method and P—Δ method according to the influential coefficients when carrying vertical load, it also improves the structural member with those coefficients when having considered P—Δ and P—δ effect , derives those methods' stability coefficient - magnified coefficient and calculation length coefficient , those data show that improved methods are more exact and the results which consider vertical load influence to structural lateral stiffness are most safe.Additionally , this article also calculates frame's inner load and deformation considering the infilled panels to take part in work in different frame aspect ratio, and the results show second-order effect can be neglected o...