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（同濟(jì)大學(xué)結(jié)構(gòu)工程與防災(zāi)研究所，上海 200092）
［摘要］采用約束混凝土的應(yīng)力-應(yīng)變關(guān)系，用數(shù)值方法計(jì)算了等效矩形應(yīng)力圖特征系數(shù)β，提出了基于有效約束區(qū)和非有效約束區(qū)的平均約束混凝土抗壓強(qiáng)度fcc,e表征約束矩形截面的混凝土強(qiáng)度，并對(duì)約束柱偏心距增大系數(shù)η和受壓區(qū)混凝土平均極限壓應(yīng)變進(jìn)行研究，參考普通混凝土偏壓柱理論提出了碳纖維纏繞加固偏壓柱承載力公式。引入文獻(xiàn)中的計(jì)算方法，即認(rèn)為約束偏壓柱的承載力是非約束的普通混凝土柱的承載力再乘以與偏心距、纖維加固率、混凝土強(qiáng)度有關(guān)的系數(shù)，對(duì)其進(jìn)行修正，使計(jì)算精度提高。已有試驗(yàn)資料驗(yàn)證了兩種計(jì)算方法的有效性。
［關(guān)鍵詞］偏心受壓；矩形截面；有效約束區(qū)；簡(jiǎn)化計(jì)算；條帶加固
Analysis on bearing capacity formula of concrete columns strengthened with wrapped CFRP sheets under eccentric compression
Yu Qiong(Institute of Structural Engineering and Disaster Reduction，Tongji University，Shanghai 200092，China)
Abstract:The characteristic coefficient β of equivalent rectangular stress block based on the stress-strain relationship of confined concrete was calculated by using numerical method，and the concrete strength of confined rectangular section characterized by average compressive strength of confined concrete fcc,e based on effectively confined area and the ineffectively confined area was proposed. The enhancement coefficient of restrained columns eccentricity  η and the average ultimate compression strain of compressive concrete were researched. A series of formulas were proposed to calculate the bearing capacity of eccentric compression column strengthened with wrapped CFRP according to eccentric compression column theory of unrestrained concrete. The calculation method of literature that the bearing capacity of the confined eccentric compression column was the bearing capacity of the non-confined common concrete column multiplied by coefficient related to eccentricity， fiber strengthening ratio and the concrete strength was modified. The precision and effectiveness of the two calculation methods were verified by test data.
Keywords:eccentric compression; rectangular section; effective confinement area; simplified calculation; straps strengthening
作者簡(jiǎn)介：余瓊，碩士，高級(jí)工程師，Email:yiongyu2005@163.com。
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