Study On Ultimate Bearing Capacity Of Fastener-style Tubular Steel Falsework With Initial Imperfection

Fastener-style tubular steel falsework space structure is a temporary structure make up of fastener and steel tube.etc.Because of collapse accident happened frequently,and our country have not constituted the criterion about this industry, made the research on this problem have very large pressure.In this dissertation,summarized and analysed domestic and abroad study actuality and development direction systemic.On the base of prophase production,farther dig and analyse was adopted on the test data.Track and record whole loading course of 5 examination,analysed distortion characteristic of whole support and local column.A fine FEM was established in the software of ANSYS simulate the test model of fastener-style tubular steel falsework,and made whole course nonlinear analyses take into account of the falsework's initial imperfection.The mostly production could be reduce to hereinafter a few aspectes:1)particular analysed study actuality and some problem await solution of fastener-style tubular steel falsework on the base of inquisition and study deeply.2)Farther analysisd the influence for the support stability aroused by horizontal pole and the cross bracing and the mutual influence between them on the base of forepart production.Analysed distortion characteristic of whole support and local column,provide referrence gist for the value ofμ,and bring forward stability analyse theory adapt to fastener-style tubular steel falsework.3)A FEM with material multilinear kinematic hardening and node semi-rigid was established in ANSYS simulate the test model of fastener-style tubular steel falsework based on material characteristic and node semi-rigid experimentation.Analyse prove the model is fine.4)Based on the data of measured imperfection,both the consistent mode imperfection method and stochastic imperfection method was employed to analyse the stability of the imperfection model,the result proved the consistent mode imperfection method is feasible in analyse fastener-style tubular steel falsework.5)Analyse result prove fastener-style tubular steel falsework should belong to imperfection-sensitive structure.Validated the brittleness failure characteristic of fastener-style tubular steel falsework and educed several significative conclusion after analysed and stutyed the deformation mode and load-displacement curve of the test,consistent mode imperfection method and stochastic imperfection method.