钢筋在最大力下总伸长率的测定方法

之前做钢筋混凝土构件试验的时候,想测量钢筋的抗拉强度对应的应变,给后续数值模拟时钢筋参数的选取提供参考。这个博文介绍一下这个参数的一个测量方法,也是当时我试验过程使用的方法。 :-) :-) 废话少说,让我们马上进入主题吧 :-) :-) 。由以上公式可知,只要在进行钢筋拉伸试验之前,对钢筋进行标记,然后测量标记前后的长度变化,就可以计算出最大力下钢筋的总延伸率 Agt 和 塑性延伸率 Ag,这两个值可以作为钢筋到到极限强度时的应变和塑性应变的估计,据此,结合钢筋的屈服强度和屈服应变,还可以大致计算出二折线钢筋本构的屈服后强化系数。

[书]PERFORM-3D原理与实例 – 第3章 – 钢筋与混凝土材料的单轴本构关系

材料非线性问题是建筑结构非线性分析中经常涉及到的问题,计算中采用的材料本构模型是否合理,直接影响弹塑性分析结果的精度,进而影响建筑结构的抗震性能评估结果。本章首先对几种典型的钢筋与混凝土材料的单轴本构进行介绍,在此基础上对PERFORM-3D [1,2]中单轴本构的处理进行介绍,并结合PERFORM-3D的规则给出常用钢筋与混凝土材料的单轴本构定义方法。Material nonlinearity problems are very common in nonlinear structural analysis. Whether the nonlinear material model used in numerical calculation is reasonable directly influence the reliability of elastoplastic analysis results, which will further affect the seismic performance evaluation of structures. In this chapter, several typical uniaxial constitutive models of steel and concrete was first introduced. On this basis, uniaxial steel and concrete constitutive models in PERFORM-3D were explained in detail. The contents cover detailed explanation of the ‘YULRX’ backbone and the Hysteresis loops in PERFORM-3D. After that, uniaxial constitutive model properties for several commonly used steel and concrete materials were defined based on the rules of PERFORM-3D.

OpenSees Steel01 Material Test

OpenSees Steel01 Material Test. Steel01是OpenSees中最简单的单轴钢筋材料,骨架曲线为二折线,默认为随动强化,可以考虑分别考虑拉压方向的各向同性强化。(Steel01 a uniaxial bilinear steel material object with kinematic hardening and optional isotropic hardening described by a non-linear evolution equation. )