- 摘 要
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李升才，章炯(華僑大學土木工程學院， 泉州 362021)
［摘要］通過6個配有焊接環(huán)式復合箍筋高強混凝土柱的水平低周反復加載試驗及有限元數(shù)值模擬，研究了箍筋對柱受力性能和變形性能的影響。試驗及數(shù)值模擬中考慮了軸壓比、配箍率這兩個參數(shù)的影響，由試驗及數(shù)值模擬得到了力與位移的滯回曲線和骨架曲線，分析了箍筋對試件延性、滯回特性、耗能性能以及正截面抗彎承載力的影響。研究結果表明，在焊接環(huán)式箍筋的約束下，試件正截面的實際抗彎承載力明顯要高于《混凝土結構設計規(guī)范》計算值，說明箍筋發(fā)揮了很好的約束作用；與一般的鋼筋混凝土柱相比，所有試件的滯回曲線都更加飽滿，沒有明顯的捏攏現(xiàn)象，證明這種箍筋的約束作用大大提高了柱的抗震能力和耗能能力；隨著箍筋的約束指標增大，試件的延性可以得到提高，并且還能減小軸壓比的增大對柱延性產(chǎn)生的不良影響。
［關鍵詞］焊接環(huán)式箍筋；約束作用；延性；耗能；滯回特性；抗彎承載力
中圖分類號：TU317+.1; TU398文獻標識碼：A文章編號：1002-848X(2012)04-009405
Research on confinement of stirrups in the high strength concrete columns with welding ring stirrups under cyclic load
Li Shengcai, Zhang Jiong(School of Civil Engineering, Huaqiao University, Quanzhou 362021, China)
Abstract:Based on low-cycle reversed lateral loading experiment and finite element numerical simulation of six high strength concrete columns with welding ring composite stirrups, the effects of the stirrups on mechanical and deformation behavior of the columns were studied. The influence of the axial compression ratio and stirrup ratio was considered in the experiment and numerical simulation, and the force-displacement hysteretic curves and skeleton curves were obtained. The effects of the stirrups on ductility, hysteretic characteristics, energy dissipation capacity and bending capacity of cross section of specimens were analyzed. The results show that test values of bending capacity of cross section of specimens are much higher than calculation values calculated by Code for design of concrete structures, the stirrups play an active role in confinement. Comparing with common reinforced concrete column, hysteretic curves of all the specimens are plumper and no obvious pinch phenomenon, which proves that the confinement of the stirrups can greatly improve the seismic capacity and energy dissipation capacity of the columns. As confinement index of the stirrup increases, ductility of the specimens can be improved, and harmful effects of the columns ductility by the increment of the axial compression ratio can be decreased.
Keywords:welding ring stirrup; confinement effect; ductility; energy dissipation; hysteretic characteristics; bending capacity
*國家自然科學基金資助(50948036)，福建省自然科學基金計劃項目(E0810022)，福建省科技計劃重點項目(2008H0029)。
作者簡介：李升才，博士，教授， Email: lsc50605@hqu.edu.cn。
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