Seismic behavior of high-strength concrete columns reinforced with high-strength steel bars
Seismic behavior of high-strength concrete columns reinforced with high-strength steel bars
复制标题
高强钢筋加固高强混凝土柱的抗震性能
DOI：
10.1016/j.engstruct.2020.110861
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发表时间：
2020-09
影响因子：
5.5
通讯作者：
Xiao Liu
中科院分区：
文献类型：
--
作者：
Jianwei Zhang;Ruxing Cai;Chen Li;Xiao Liu
为研究纵向钢筋强度等级、间距、混凝土强度和轴压比对高强混凝土柱抗震性能的影响，进行了7根标称屈服强度为600 MPa的高强钢筋（HSSB）和普通钢筋（HSSB）配筋的足尺高强混凝土方柱在恒定轴压和反复水平荷载作用下的试验。并在ABAQUS中进行了相应的非线性有限元分析。分析了不同使用状态下的柱顶变形、侧向荷载、刚度退化、承载力退化以及纵、横向钢筋的应变。试验结果表明，高强混凝土柱宜选用名义屈服强度为400 MPa的钢筋作为配筋，而纵向配筋率是决定高强混凝土柱纵向配筋能否在最大点前达到压缩或拉伸屈服应变的重要因素。采用高强钢带作为纵向配筋（等效体积置换），大大提高了高强混凝土柱的抗震性能。在考虑应变梯度对受压混凝土应力-应变关系影响的基础上，基于Razvi和Saatcioglu建立的有限应变梯度模型，建立了适用于有限元分析的有限应变梯度模型。对不同服役状态下的变形和侧向荷载进行了具体的有限元模型验证，为进一步的参数分析奠定了基础。数值分析部分详细研究了位移延性系数的变化趋势。在合理的配筋率和延性特征值下，高强钢带高强混凝土柱的位移延性可达到4级以上，满足规范对延性的要求。
To investigate the influence of longitudinal reinforcement strength grade, stirrup spacing, concrete strength and axial load ratio (ALR) on seismic behavior of high-strength concrete (HSC) columns, seven full-scale square HSC columns reinforced with high-strength steel bars (HSSB) with nominal yield strength of 600 MPa or conventional steel bars were tested under constant axial load and cyclic lateral load. Furthermore, corresponding nonlinear finite element analysis was conducted in ABAQUS. The column top deformation and lateral load at different service states, stiffness degradation, bearing capacity degradation and strain of longitudinal and transverse reinforcement were discussed. The test result shows that using steel bars with nominal yield strength of 400 MPa as stirrup is a better choice for HSC columns and ALR is an important factor which determines whether the high-strength longitudinal reinforcement can reach its compressive or tensile yield strain before maximum point. Taking HSSB as longitudinal reinforcement (equivalent volume replacement) greatly improves the seismic behavior of HSC columns. After taking the influence of strain gradient on stress-strain relationship of compressive concrete into consideration, a confined strain gradient model (CSGM) which was suitable for finite element analysis (FEA) was established based on the model established by Razvi and Saatcioglu. Specific verification of finite element model (FEM) on deformation and lateral load at different service states were presented for further parameter analysis. The trend of displacement ductility factor were investigated in detail in numerical analysis part. With proper ALR and stirrup characteristic value, HSC columns reinforced with HSSB is able to present a displacement ductility of higher than 4, which is capable to meet the ductility demand of most codes.
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DOI：
10.14359/7587
发表时间：
1967-09
期刊：
--
影响因子：
--
作者：
Llewellyn E. Clark;K. Gerstle;L. Tulin
通讯作者：
Llewellyn E. Clark;K. Gerstle;L. Tulin
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
影响因子：
5.5
作者：
S. Hwang;H. Yun
通讯作者：
S. Hwang;H. Yun
DOI：
10.1061/(asce)0733-9445(1998)124:3(233
发表时间：
1998-03
期刊：
Journal of Structural Engineering-asce
影响因子：
--
作者：
C. Claeson;K. Gylltoft
通讯作者：
C. Claeson;K. Gylltoft
DOI：
10.14359/6914
发表时间：
1981-05
期刊：
--
影响因子：
--
作者：
R. Carrasquillo;A. H. Nilson;F. Slate
通讯作者：
R. Carrasquillo;A. H. Nilson;F. Slate