钢筋混凝土双肢柱抗震加固与震后修复的试验研究

EXPERIMENTAL STUDY ON STRENGTHENING AND REHABILITATING THE TWIN COLUMNS OF THE REINFORCED CONCRETE FOR SEISMIC RESISTANCE

本文结合我国双肢柱厂房和太钢工程实际,在钢筋混凝土双肢柱试验研究的基础上:①对4榀已发生压肢破坏的双肢柱采用外包钢方法重新进行修复加固和水平加荷试验;②对比了外包钢双肢柱与钢筋混凝土双肢柱每一加载阶段荷载——位移及外包钢钢板箍应变关系;③在刚度、强度、变形方面,探讨了钢筋混凝土双肢柱采用外包钢加固和震后修复效果及抗震性能;④分析了外包钢双肢柱在水平力作用下裂缝出现、屈服时拉肢与压肢的刚度分配关系。

Based on the test study of the reinforced concrete twin columns as well as the Taigang existingprojects and twin column factory buildings, several strengthening measures and test research are con-ducted, which are mainly introduced as follows: <1> four sets of the failure reinforced concrete twincolumns are rehabilited and strengthened, and then the horizontally loading tests are conducted onthem; <2> the relationships of the load-displacement and strain in loading process are compared be-tween the twin columns which are covered by steel and the reinforced concrete twin cloumns;<3> Aseismic behavior of these twin columns and their efficiency of the strengthening and rehabitationare discussed in the aspect of the crack, strength and deformation; <4> the distribution between thetensile and compessive legs are analyzed after the cracks and yield strengthes of the twin columns co-vered by steel are reached under the action of the horizontal force.