[提要]  通过两根体外预应力梁的加载试验，对试验的全过程进行了跟踪测试，并把理论分析结果与实测结果进行了比较。对于次弯矩的考虑提出了自己的看法。这对体外预应力及无粘结预应力连续梁的设计有一定的参考价值。
[关键词]  体外预应力 连续梁 次弯矩 极限状态

Based on the test of two external prestressed concrete beams and the data recorded during the test, the authors analysed the beams theoretically and compared the theoretic results with the test results and put out the opinion on the second moment of prestressed concrete structures, which may be helpful to the design of unbonded or external prestressed concrete structures.
Keywords:  external prestressing; continuous beam; second moment; ultimate state