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Modeling for complete stress-strain curve of circular concrete columns confined with steel spiral and FRP
Journal of Building Engineering ( IF 6.4 ) Pub Date : 2021-09-13 , DOI: 10.1016/j.jobe.2021.103294
Yang Wei 1 , Kunting Miao 1 , Xi Zhang 1 , Yongfeng Zhou 1 , Kaiqi Zheng 1
Affiliation  

The results of 153 specimens from an experimental study on fiber-reinforced polymer (FRP) and steel spiral-confined (FRP-SS-confined) circular concrete columns were collected from accessible literature to establish a database. The existing models of FRP-SS-confined circular concrete columns were included and evaluated. A new stress-strain model with a simple, continuous, general expression was put forward for FRP-SS-confined circular concrete columns by taking into account various confining conditions during the loading process. Calculation models of the ultimate stress, ultimate strain, peak stress and peak strain were proposed by considering the contributions from both steel spiral confinement and FRP confinement. The comparison showed that the elastic stage, nonlinear transition stage, linear hardening stage and residual stage of the stress-strain curves were well captured by the proposed model for FRP-SS-confined circular concrete columns. Compared with other existing models, the proposed model showed better flexibility and versatility for practical application. In particular, various declining trends in the residual stages corresponding to the different confining conditions were well predicted by the proposed model. Furthermore, the effects of different parameters (steel tube thickness, FRP type, FRP layer and unconfined concrete strength) on the behavior of FRP-SS-confined circular concrete were discussed.



中文翻译:

钢螺旋和FRP约束圆形混凝土柱完整应力-应变曲线建模

从可访问的文献中收集了 153 个关于纤维增强聚合物 (FRP) 和钢螺旋约束 (FRP-SS-约束) 圆形混凝土柱的实验研究的结果,以建立数据库。包括并评估了 FRP-SS 约束圆形混凝土柱的现有模型。针对FRP-SS约束圆形混凝土柱,考虑加载过程中的各种约束条件,提出了一种新的具有简单、连续、通用表达式的应力-应变模型。综合考虑钢螺旋约束和FRP约束的贡献,提出了极限应力、极限应变、峰值应力和峰值应变的计算模型。比较表明弹性阶段、非线性过渡阶段、所提出的 FRP-SS 约束圆形混凝土柱模型很好地捕捉了应力-应变曲线的线性硬化阶段和残余阶段。与其他现有模型相比,所提出的模型在实际应用中表现出更好的灵活性和通用性。特别是,所提出的模型很好地预测了对应于不同围限条件的剩余阶段的各种下降趋势。此外,还讨论了不同参数(钢管厚度、FRP 类型、FRP 层和无侧限混凝土强度)对 FRP-SS 有约束圆形混凝土性能的影响。特别是,所提出的模型很好地预测了对应于不同围限条件的剩余阶段的各种下降趋势。此外,还讨论了不同参数(钢管厚度、FRP 类型、FRP 层和无侧限混凝土强度)对 FRP-SS 有约束圆形混凝土性能的影响。特别是,所提出的模型很好地预测了对应于不同围限条件的剩余阶段的各种下降趋势。此外,还讨论了不同参数(钢管厚度、FRP 类型、FRP 层和无侧限混凝土强度)对 FRP-SS 有约束圆形混凝土性能的影响。

更新日期:2021-09-13
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