Experimental study and design calculation for compressive strengths of cold formed thick-wall sections

摘要

In order to investigate section capacities of thick-wall cold formed steel with square andnrectangular hollow cross-sections, experiments were carried out on mechanical properties of thenflat coupons, corner coupons, parent steel coupons and full section stub columns. Strainnhardening of cold forming thick-wall cold formed sections was investigated. The stub column testnstrengths were compared with the design compressive strengths specified by the Australian/NewnZealand and Chinese standards for the design of the cold formed steel structural membersnrespectively. It has been shown that the strength predicted by the Australian/New Zealandnstandard using material properties and that forecasted by the Chinese standard based on thenaverage design yield stress of the full section are a little conservative. The two mean strengthsnpredicted by Australian/New Zealand standard based on the mean design yield stress andnforecasted by the Chinese standard using material properties tests are identical, which arensuperior to the present thick-wall cold formed steel tubes because of their safety and economy.