Cyclic stress-strain model incorporating buckling effect for steel reinforcing bars embedded in FRP-confined concrete
Cyclic stress-strain model incorporating buckling effect for steel reinforcing bars embedded in FRP-confined concrete
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考虑 FRP 混凝土钢筋屈曲效应的循环应力-应变模型
DOI：
10.1016/j.compstruct.2017.09.007
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发表时间：
2017-12
影响因子：
6.3
通讯作者：
Ozbakkaloglu Togay
中科院分区：
文献类型：
--
作者：
Bai Yu Lei;Dai Jian Guo;Ozbakkaloglu Togay
普通钢筋混凝土圆柱体的承载力和极限状态通常会因钢筋的屈曲而突然丧失。然而，由于纤维增强聚合物（FRP）的侧向约束效应，在FRP约束的钢筋混凝土柱中，钢筋的行为有所不同。本文对FRP约束混凝土中纵向钢筋在循环轴压作用下的屈曲性能进行了理论研究。将考虑屈曲效应的经验单调压缩应力-应变模型推广到循环模型，该模型结合单调包络线和考虑循环环的Menegotto-Pinto模型。然后将横向支撑钢筋和FRP约束素混凝土的循环应力-应变模型实施到OpenSees软件平台中，并通过与循环加载FRP约束素混凝土和RC圆柱体的压缩试验结果进行比较来验证。建议的循环应力-应变模型的横向支撑钢筋预计将作为一个基本模型预测FRP加固钢筋混凝土柱的抗震性能与宽间距的横向拉杆在循环轴压下，在这种情况下，钢筋的局部屈曲通常发生在两个相邻的横向拉杆之间。
Buckling of steel reinforcement usually causes a sudden loss of the load-carrying capacity and the ultimate state of conventional reinforced concrete (RC) cylinders. However, reinforcing bars behave differently in fiber-reinforced polymer (FRP)-confined RC cylinders due to the lateral confinement effect of FRP. This paper presents a theoretical study into the buckling behavior of longitudinal steel reinforcing bars embedded in FRP-confined concrete subjected to cyclic axial compression. An empirical monotonic compressive stress-strain model considering the buckling effects proposed previously for laterally supported reinforcing bars is extended to a cyclic model by combining the monotonic envelope and the Menegotto-Pinto model accounting for the cyclic loops. The cyclic stress-strain models for both laterally supported reinforcing bars and FRP-confined plain concrete are then implemented into the OpenSees software platform and validated through comparisons with compressive test results on cyclically loaded FRP-confined plain and RC cylinders. The proposed cyclic stress-strain model for laterally supported reinforcing bars is expected to serve as a fundamental model for predicting the seismic behavior of FRP-strengthened RC cylinders with widely-spaced transverse ties under cyclic axial compression, in which case the local buckling of reinforcing bars usually occurs between two adjacent transverse ties.
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影响因子：
3.8
作者：
T. Rousakis;A. Karabinis
通讯作者：
T. Rousakis;A. Karabinis
受循环轴压作用的 CFRP 约束大型圆形 RC 柱的实验测试和分析模型
影响因子：
5.5
作者：
Wang Zhenyu;Wang Daiyu;Smith Scott;Lu Dagang
通讯作者：
Lu Dagang
DOI：
10.1061/(asce)0733-9445(1988)114:8(1804
发表时间：
1988-08-01
期刊：
JOURNAL OF STRUCTURAL ENGINEERING-ASCE
影响因子：
--
作者：
MANDER, JB;PRIESTLEY, MJN;PARK, R
通讯作者：
PARK, R
DOI：
10.1061/(asce)0733-9445(2002)128:10(1253
发表时间：
2002-10
期刊：
Journal of Structural Engineering-asce
影响因子：
--
作者：
R. Dhakal;K. Maekawa
通讯作者：
R. Dhakal;K. Maekawa
DOI：
10.1061/(asce)st.1943-541x.0000808
发表时间：
2014
期刊：
Journal of Structural Engineering-asce
影响因子：
--
作者：
Z. Zong;S. Kunnath;G. Monti
通讯作者：
Z. Zong;S. Kunnath;G. Monti