Evaluation of the Ultimate Steel Stress in Partially Prestressed Concrete Members
Evaluation of the Ultimate Steel Stress in Partially Prestressed Concrete Members
复制标题
部分预应力混凝土构件的极限钢筋应力评估
DOI：
10.15554/pcij.01011991.62.82
复制
发表时间：
1985
期刊：
影响因子：
--
通讯作者：
M. Harajli
中科院分区：
文献类型：
--
作者：
A. Naaman;M. Harajli
采用非线性分析方法研究了部分预应力混凝土无粘结构件名义抗弯强度时预应力筋中的应力fps。探讨了不同的参数，提出了一个合理的分析模型，解释了构件跨高比的机理及其对预测FPS的影响。目前的调查，实验观察的支持下，表明荷载应用的类型，在连续构件的加载模式，普通受拉钢筋的量和跨高比有一个显着的影响FPS除了参数PP！目前在ACt代码中采用的fJ。虽然目前的研究支持最近ACt在计算FPS时采用杆件跨高比参数，但它表明，在目前的形式下，其实施是不必要的。基于广泛的参数评估，建议和统一的设计方程计算FPS在有粘结和无粘结的成员，表示为熟悉的设计参数的函数，提出。附录B中提供了使用建议的预测方程的数值示例。
The stress fps in the prestressing steel at nominal flexural strength of partially prestressed concrete unbonded members is investigated using a nonlinear analysis. Many different parameters are explored and a rational analytical model explaining the mechanism of member span-depth ratio and its effect on the predicted fps is presented. The present investigation, supported by experimental observations, shows that the type of load application, the loading pattern in continuous members, the amount of ordinary tension reinforcement and span-depth ratio have a significant effect on fps in addition to the parameter pp!fJ currently adopted in the ACt Code. While the current study supports the recent ACt adoption of member span-depth ratio parameter in computing fps , it shows that its implementation is unwarranted in the present form. Based on an extensive parametric evaluation, recommendations are given and unified design equations for computing fps in both bonded and unbonded members, expressed as a function of familiar design parameters, are proposed. Numerical examples illustrating the use of the proposed prediction equations are provided in Appendix B.