论文部分内容阅读
生产预应力构件的施工单位需经常冷拉钢筋,钢筋冷拉一般有两种控制方法,即控制应力和控制冷拉率。在钢筋冷拉前后,均要通过试验来确定钢筋的物理力学性能指标(即屈服强度、极限强度、延伸率和冷弯脆性)与冷拉控制指标,以便确定所用钢筋是否合格、冷拉控制指标和冷拉后钢筋是否满足使用要求。因此,每批钢筋的取样试验需要2根拉力试样和2根冷弯试样,检验冷拉前后钢筋的物
The construction unit that produces the prestressed components needs to pull cold-reinforcing steel often. There are generally two control methods for the cold-drawn steel bars, namely control stress and control cold drawing rate. Before and after cold-rolled steel bars, the physical and mechanical properties of the steel bars (ie, yield strength, ultimate strength, elongation, and cold-form brittleness) and cold-drawn brittleness control indicators are determined through tests to determine whether the used steel bars are qualified or not. And whether the steel bars meet the requirements for use after cold drawing. Therefore, the sampling test for each batch of rebar requires two tensile specimens and two cold-formed specimens to test the reinforcement before and after cold drawing.