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等效荷载概念在预应力结构的研究和设计中存在广泛应用.依据等效荷载的经典定义,对线性变换后预应力等效荷载是否变化进行论述,指出采用等效荷载法计算预应力混凝土受弯构件在使用阶段的预加力反拱值时,应取用净截面刚度.针对工程界提出的一些观点,用解析方法证明直线、抛物线组合线型力筋的预应力作用仍可用等效荷载法计算,以及等效荷载法并不存在与预应力筋线型相关的局限性.为回答无粘结、有粘结预应力筋应力增长后等效荷载是否变化的问题,提出实时等效荷载的概念,建立了预应力混凝土梁实时等效荷载的计算方法.推导基于实时等效荷载的承载力极限状态平衡方程,并证明其与将预应力筋完全作为抗力材料的平衡方程具有等价性.最后,介绍了实时等效荷载运用于预应力结构非线性阶段变形计算时所体现的优越性.
The concept of equivalent load is widely used in the research and design of prestressed structures.According to the classical definition of equivalent load, whether the prestressed equivalent load changes after linear transformation is discussed, and the equivalent load method is used to calculate whether the prestressed concrete The net section stiffness should be taken into account when using prestressing cambering of the flexural members in the service phase.According to some suggestions put forward by the engineering field, the analytic method is used to prove that the prestressing effect of the linear and parabolic composite linear tendons can still be obtained by the equivalent load Method and the equivalent load method does not exist the limitations related to the prestressing tendon linear model.In order to answer the question of whether the equivalent load changes after the stress increase of the unbonded and prestressed tendons, the real-time equivalent load , The calculation method of real-time equivalent load of prestressed concrete beam is established, and the equilibrium equation of ultimate state of bearing capacity based on real-time equivalent load is deduced and proved to be equivalent to the equilibrium equation of fully prestressed tendons as the material of resistance Finally, the advantages of real - time equivalent load applied in the deformation calculation of nonlinear phase of prestressed structure are introduced.