- 摘 要
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（西安理工大學土木建筑工程學院, 西安 710048）
［摘要］通過5根預(yù)應(yīng)力鋼絞線加固受損鋼筋混凝土柱軸心受壓試驗，研究了受損柱在預(yù)應(yīng)力鋼絞線加固后的破壞特征和破壞機理，以裂縫寬度作為受損指標，對比了不同受損程度下加固柱的極限承載力和延性。試驗結(jié)果表明，預(yù)應(yīng)力鋼絞線加固方式充分發(fā)揮了鋼絞線的約束能力，極大地改善了原構(gòu)件的力學性能；受損柱極限承載力得到了提高，其延性也得到了明顯的改善。在分析其破壞機理的基礎(chǔ)上，提出了預(yù)應(yīng)力鋼絞線加固受損鋼筋混凝土柱的極限承載力計算公式，為該加固方式的應(yīng)用提供了參考依據(jù)。
［關(guān)鍵詞］預(yù)應(yīng)力鋼絞線加固； 軸心受壓試驗； 裂縫寬度； 極限承載力； 延性
中圖分類號：TU375文獻標識碼：A文章編號：1002-848X(2020)15-0025-05
Experimental study on axial compression of damaged reinforced concrete columns reinforced by prestressed steel strands
SI Jianhui, DUAN Zhenwei, LIU Maoshe, LU Junlong, TIAN Jianbo
（School of Civil Engineering and Architecture，Xi′an University of Technology, Xi′an 710048， China）
Abstract:Through the axial compression test of five damaged reinforced concrete columns reinforced by prestressed steel strands, the damage characteristics and damage mechanism of the damaged column after reinforcement by prestressed steel strand were studied. Taking the width of crack as the damage index, the ultimate bearing capacity and ductility of reinforced columns with different damage degree were compared. The experimental results show that prestressed steel strand reinforcement way fully exerts the restraining ability of the steel strand and greatly improves the mechanical properties of the original member. The ultimate bearing capacity of the damaged column is improved, and its ductility is also significantly improved. Based on the analysis of its failure mechanism, the formula for calculating the ultimate bearing capacity of damaged reinforced concrete columns reinforced by prestressed steel strands is proposed, which provides a reference for the application of this reinforcement.
Keywords:prestressed wire steel strand reinforcement; axial compression test; crack width; ultimate bearing capacity; ductility
*國家自然科學基金（51608441），陜西省自然科學基礎(chǔ)研究計劃資助項目（2017JQ5032），陜西省高?？茀f(xié)青年人才托舉計劃項目（20170513），西安理工大學科技創(chuàng)新計劃項目（2015CX019）。
作者簡介：司建輝，博士，副教授，Email：sjhfr@163.com。
