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箍筋約束混凝土的單軸力學(xué)性能研究

齊 虎1，李云貴2，呂西林1(1 同濟(jì)大學(xué)結(jié)構(gòu)工程與防災(zāi)研究所，上海 200092； 2 中國建筑科學(xué)研究院建筑工程軟件研究所，北京 100013)

［摘要］深入研究箍筋約束作用對混凝土軸心受壓力學(xué)性能的影響，對Saatcioglu提出的約束混凝土單軸本構(gòu)模型做了一定改進(jìn)，推導(dǎo)了Saatcioglu模型參數(shù)與配箍特征值λv之間的關(guān)系，使之能更加方便地用于我國鋼筋混凝土結(jié)構(gòu)的計(jì)算分析中。對收集的多組試驗(yàn)數(shù)據(jù)進(jìn)行研究，提出形式簡單的峰值應(yīng)力計(jì)算公式。計(jì)算結(jié)果與試驗(yàn)結(jié)果比較表明，提出的公式具有較好的計(jì)算精度，適用于圓形和矩形截面構(gòu)件，且形式簡單、參數(shù)少，適于在實(shí)際工程的計(jì)算分析中應(yīng)用。

［關(guān)鍵詞］ 箍筋約束作用；混凝土力學(xué)性能；峰值應(yīng)力

中圖分類號：TU375.02，TU528.01文獻(xiàn)標(biāo)識碼：A文章編號：1002-848X(2011)01-0079-04

Study of uniaxial mechanical behavior of concrete confined with hoops

Qi Hu1, Li Yungui2, Lü Xilin1

(1 Institute of Structural Engineering and Disaster Reduction, Tongji University, Shanghai 200092, China;

2 Institute of Building Engineering Software, China Academy of Building Research, Beijing 100013, China)

Abstract:The effect of overlapping hoops on mechanical behavior of concrete under uniaxial compression was deeply studied. The uniaxial constitutive model proposed by Saatcioglu was improved.  The relationship between parameters in Saatcioglu model and the stirrup characteristic was derived, so that the improved model can be more convenient for the analysis of reinforced concrete structure in China. The formula of peak stress of confined concrete was established based on the analysis of a large number of existed testing data. Comparison of the calculated results and the experimental results shows that the formula proposed has good accuracy and it is simple in form and few in parameters which is suitable for circular and rectangular cross-section, as well as in calculation and analysis of practical engineering.

Keywords:effect of overlapping hoop; mechanical behavior of concrete; peak stress

*國家“十一五”科技支撐計(jì)劃課題(2006BAJ01B07)。

作者簡介：齊虎，博士研究生，Email: qihu_810@163.com。

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