近年来,无粘结预应力正愈来愈多地在后张预应力混凝土结构中应用。但已发现,无粘结构件的抗弯性能、裂缝宽度、变形和极限强度,均比有粘结构件的相应性能差。那么,如何弥补其不足呢? 本讲系根据日本京都大学土木工程系冈田青教授等学者所进行的无粘结部分预应力混凝土梁的静力和长期荷载试验,重点介绍在无粘结梁中靠近梁底部边缘配置普通钢 In recent years, unbonded prestressing is increasingly being applied in post-tensioned prestressed concrete structures. However, it has been found that the non-bonded members have poor bending performance, crack width, deformation, and ultimate strength as compared to the corresponding properties of the bonded members. Then, how to make up for the shortcomings? This lecture is based on the static and long-term load tests of unbonded partially prestressed concrete beams carried out by academics such as Professor Okada Qing of the Department of Civil Engineering at Kyoto University in Japan, focusing on the non-bonded beams. Medium steel near the bottom edge of the beam