T形柱中约束混凝土的应力应变模型

Stress-Strain Model of Confined Concrete in T-Shaped Columns

为建立T形柱约束混凝土的应力应变全曲线方程,根据T形柱配箍特征值的使用范围,设计了13个试件.通过轴心受压试验,得到钢筋混凝土T形柱的试验结果.采用灰色优化和数据变换理论,建立了T形柱中约束混凝土应力应变模型.对测试数据进行统计分析,得到了模型的系统参数.该模型反映了T形柱中约束混凝土应力应变曲线的变化规律.与方形柱的约束混凝土应力应变模型相比,T形柱中约束混凝土峰值应力较小,峰值应变较大,下降段曲线相对较陡.研究结果为T形柱的非线性分析提供了理论依据.

To develop a stress-strain relationship model of confined concrete in T-shaped columns, 13 specimens were designed according to the application range of volume reinforcement characteristic and the experiments were carried out. Based on the stress-strain curves for confined concrete picked up in the axial compression experiments ,the gray optimization and data transformation were employed to establish a stress-strain model. The system parameters of the model were obtained by analyzing the test data statistically,which reflected the changing regularity for stress-strain curves of the confined concrete. The results show that,compared with the stress-strain model for the confined concrete in square-section columns ,the peak stress is smaller in T-shaped columns,while the peak strain is larger and the descending curve is relatively steeper. The findings provide theoretical basis for the nonlinear analysis of T-shaped columns.