根据作者提出的悬臂与单跨对称和非对称弯曲构件中无粘结预应力筋极限应力增量的二次方程解,本文对两类构件α_2 系数的同一性进行了证明。根据试验结果,确定了α_2 系数的取值。由此给出了计算悬臂与单跨对称和非对称弯曲构件中这一变量的二次方程统一表达式。

In this paper,it's proved that in the quadratic equationsof calculating the ultimate stress increment of unbonded prestressed tendonsboth int cantilever and in single span symmetrical and unsymmetricalbending members,the coefficient a_2 may be given the same value.Basedon flexural experiments of unbonded prestrssed beams,the value is confi-rmed to be 0.76.From this conclusion,an unified quadratic equation forcalculating the ultimate stress increment under any loading and supportingconditions is acquired.The result makes the theory of author more perfectand more practicable.