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一、前言为了适应出口螺纹钢筋的需要,国家标准局于1985年发布了GB5029-85《钢筋平面反向弯曲试验方法》,其后冶金部于1986年发布YB(T)27(1)-86,在该标准中第一次把反弯性能作为螺纹钢筋的技术要求列入标准中。在尚未发布的GB1499中亦把反弯性能作为较高使用要求的热Ⅱ、Ⅲ级钢筋的技术条件列入其补充件,供用户根据需要而进行选择。 GB5029-85明确规定平面反向弯曲试验在电动钢筋弯曲机或其它型式试验机上进行。但现行建筑部门使用的电动钢筋弯曲机毕竟是一种工业设备,虽然它可作φ6～40的
I. Preface In order to meet the need of exporting rebar, the National Bureau of Standards released the GB5029-85 “Test Method for Plane Reverse Bending in Reinforced Bar” in 1985, and later the Ministry of Metallurgy issued YB (T) 27 (1) -86 , The first time in the standard of bending performance as a technical requirements for rebar included in the standard. GB1499 has not yet released in the bending performance as a higher requirements for the use of heat Ⅱ, Ⅲ grade steel technical conditions included in its supplement, for users to choose according to need. GB5029-85 clearly stipulates plane reverse bending test in the electric steel bending machine or other type testing machine. However, the current electric steel bending machine used in the construction sector is, after all, an industrial device, although it can be used for φ6 to 40