一、前言近来,无粘结体系正日益广泛地用于简化后张预应力混凝土结构中麻烦的灌浆工序。然而无粘结构件的抗弯性能,例如裂缝宽度、变形及极限强度则不如有粘结构件。本文通过静载和长期荷载试验,研究了设置在靠近梁底的非预应力筋对改善无粘结预应力梁抗弯性能的作用和混凝土收缩徐变引起的预应力损失的影响。二、静载试验 1.试验方法对简支梁进行了静载试验,见表1-(1)和图1。 I. INTRODUCTION Recently, non-bonded systems are increasingly used to simplify the troublesome grouting process in post-tensioned prestressed concrete structures. However, the non-bonded members have less bending resistance, such as crack width, deformation, and ultimate strength, than the bonded members. In this paper, the effect of non-prestressed tendons located near the bottom of beams on the bending performance of unbonded prestressed beams and the influence of concrete shrinkage and creep on the loss of prestress are investigated through static load and long-term load tests. II. Static load test 1. Test method Static load test was carried out on simply supported beams. See Table 1-(1) and Figure 1.