约束混凝土柱配置高强纵筋小偏压性能分析

采用高强箍筋能够对高强混凝土形成有效约束并大幅提高其变形能力，为受压构件中配置高强度纵筋奠定了基础。本文提出采用高强度钢筋（500 MPa 以上）作为高强箍筋约束高强混凝土柱中的纵筋。首先对建立的有限元模型与相同参数下的试验结果进行对比，验证了模型的准确性；然后，采用有限元方法分析了箍筋间距、纵向钢筋配筋率对纵筋应力水平、混凝土强度的影响，结果表明合理的选择箍筋间距，高强纵筋在构件中可发挥较好的作用；最后，探讨了纵向钢筋强度与构件承载力之间的关系，为约束混凝土柱中配置高强纵筋的理论研究与应用提供了参考。

Study on the small eccentric compression behavior of confined concrete column with high-strength longitudinal reinforcement

Using high-strength stirrups can form an effective constraint on high-strength concrete and greatly improve the deformation capacity, laid the foundation for high-strength longitudinal reinforcement used in the compressed member.This paper puts forward using high-strength steel bars(above 500 MPa)as longitudinal reinforcement of high-strength concrete column confined by high-strength stirrups.At first,it compares the finite element model results with the test results under the same parameters, and the accuracy of the model is verified. Then,by using the finite element method to analyze the influence of the stirrup spacing and longitudinal reinforcement ratio on longitudinal reinforcement stress level and concrete strength, it turns out that high-strength longitudinal reinforcement will play a good role in the member with a reasonable stirrup spacing. Finally,it discusses the relationship between the strength of longitudinal reinforcement and bearing capacity of the member. It provides a reference for theory research and application of high-strength longitudinal reinforcement used in confined concrete column.