箍筋对钢筋混凝土约束梁屈服后剪坏延性影响的试验研究

THE EXPERIMENTAL INVESTIGATION ON INFLUENCING OF STIRRUPS ON DUCTILITY OF POST-YIELD SHEAR FAILURE IN REINFORCED CONCRETE RESTRAINED BEAMS

本文对12根均布荷载作用下钢筋混凝土约束梁进行了试验,主要研究其屈服后剪坏的性能。由试验得出,影响构件屈服后剪坏的主要因素是纵筋配筋率,当纵筋配筋率一定时,构件屈服后剪坏的极限转角和延性随含箍特征值的增加而增加。本文给出了建议计算公式和在支座截面负弯矩区,箍筋间距应不大于h_(0/4)的构造措施.

This paper presents the experimental study on ultimate ro- tation and ductility of post-yield shear failure beams.12 reinforced concrete restrained beams under uniform loading were tested. The conclusions obtained include. 1 The tensile reinforcement ratio is the main factor that influences on ductility behavior of post-yield shear failure; the ultimate rotation and ductility ratio increase with the stirrups for given tensile reinforcement ratio. 2 The spacing of stirrups should be less than d/4(d-effective depth of beams ) near the supports. Based on the experimental and collected data, design formulas are pro- posed.