[提要]  根据10榀无粘结部分预应力混凝土框架结构在竖向或水平低周反复荷载作用下的试验结果，提出了等效节点刚域概念和等效塑性铰长度计算的建议公式，并运用结构塑性极限分析原理推导了不同破坏机构相应的框架结构极限荷载计算公式，计算结果与试验结果吻合较好。
[关键词]  无粘结部分预应力混凝土 框架 塑性分析

Based on the test results of ten unbonded prestressed concrete frames subjected to vertical or horizontal cyclic loading, a concept of equivalent rigid joint region is put forward and an empirical formula is proposed to calculate the length of the equivalent plastic hinge. Then expressions are derived by the way of plastic analysis for ultimate loads of the structures corresponding to different collapse mechanisms.
Keywords: unbonded partially prestressed concrete; frame; plastic analysis