【摘要】 针对我国行业标准《无粘结预应力混凝土结构技术规程》(以下简称《规程》)中,对无粘结预应力筋的极限应力设计取值规定的不足,根据大量的试验数据,推导出了适用于桥梁工程的无粘结预应力混凝土上部结构多种截面形式的无粘结筋极限应力增量实用简化计算方法。同时根据试验结果得出无粘结预应力混凝土受弯构件在反复荷载作用下的性能是可靠的结论。更多还原

【Abstract】 The formula for ultimate stress of prestressed concrete beams with unbonded tendons in present code is only applied to the beam of rectangular cross-section. In this paper,a new formula suitable for various cross-section of bridge beams is established based on test research. In addition results of repeated bending fatigue testt show that the function of unbonded tendons in prestressed concrete beams is reliable.更多还原