无粘结与有粘结预应力混凝土梁抗震性能的试验对比研究

基于四对无粘结预应力混凝土梁与有粘结预应力混凝土梁的低周反复加载试验，较为系统地研究了上述两种预应力混凝土梁的延性、耗能性、变形恢复能力及破坏特征等抗震性能。研究表明：无粘结预应力混凝土梁的延性和变形恢复能力优于有粘结预应力混凝土梁，其延性系数平均高出20%；有粘结预应力混凝土梁的耗能能力优于无粘结预应力混凝土梁，其等效粘滞系数平均高出29.2%；有粘结预应力混凝土梁的承载力略高于无粘结预应力混凝土梁，其承载力平均高出7.42%；研究成果为不同工程情况下预应力梁的设计与选用提供参考。

EXPERIMENTAL STUDY ON SEISMIC PERFORMANCE OF UNBONDED AND BONDED PRESTRESSED CONCRETE BEAMS

Four pairs of unbonded and bonded prestressed concrete beams are tested under low reversed cyclic loading to investigate seismic performance, such as ductility, energy dissipation capacity, displacement restoring capacity, failure patterns, etc. Studies have shown that unbonded prestressed concrete beam is better than bonded one in ductility (ductility factor is higher by 20% in average) and displacement restoring capacity. Bonded prestressed concrete beam is better than unbonded one in energy dissipation capacity (coefficient of viscous is higher by 29.2% in average). Bonded prestressed concrete beam is better in carrying capacity than unbonded one (carrying capacity is higher by 29.2% in average). The results would provide a reference for the design and application of prestressed concrete structures in different conditions.