无粘结部分预应力混凝土受弯构件设计方法

为满足承载能力极限状态及正常使用极限状态的要求，必须对无粘结部分预应力混凝土受弯构件进行合理设计。论文建立了无粘结部分预应力混凝土受弯构件截面设计分析方法，首先采用预应力比率法来确定无粘结预应力筋和有粘结非预应力筋的用量，而后检查构件的实际预应力度是否满足结构的要求，并分析验算的实际抗弯强度及正常使用极限状态构件的应力、挠度、裂缝宽度。文中还给出一个设计示例。

Design Method of Unbonded Partially Prestressed Co ncrete Flexural Members

In order to satisfy the requirements of both ultimate limit state and servicing limit state unbonded partially pre stressed concrete flexural members must be reasonably designed.The paper estalished the design procedure of the above members.The area of unb onded prestressed steel and the area of nonprestressing tension steel were determined by the ratio of prestressing force to total tension f orce,and then the degree of prestressing was checked.Then the members′ flexural strength at ultimate,deflection,width of cracks and stresses at servicing load were analyzed.A design example was also given in t he paper.