重复荷载作用下无粘结部分预应力混凝土梁的抗剪强度

The shear strength for partially prestressed concrete with unbonded tendons under fatigue loading

依据 8片无粘结部分预应力混凝土梁的试验结果 ,分析了在重复荷载作用下斜向裂缝、箍筋应力的发展机理及试验梁的破坏现象 ,研究了抗剪强度随疲劳次数的衰减规律 ,提出了疲劳抗剪强度折减系数的计算公式 ;并对影响箍筋应力主要因素进行了简要分析 。

Based on the fatigue test results of 8 P.P.C beams with unbonded tendons, this paper analyses the effects on inclined cracks,stirrups stress and fatigue failure, the rule of declining of shear strength with loaded times is found and a formula of calculating the fatigue strength reduction factor is proposed, on the basis of the study of main factors which influence stirrup stress, another formula which is used to calculate stirrup stress is established.