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Hi, I'm studying how ADAPT PT software compute the demand capacity depends on how many percent of PT to be considered in total moment strength with lateral moments change sign. With the logical equation of Mhyp/Mtotal Cap. = % of Mhyp But with my experiment consider negative and positive...

rapt, On my point of view, previous and recent ACI 318 code do not explicitly provide restrictions or prohibitions to the use of Bonded Tendons for Special Moment Resisting Frames (SMRF). Also on their commentary said that "these provisions were developed, in part, based on observations of...

Hi rapt, Sorry for forgetting to write the exact code. The Code is ACI 318-14: Section 18.6.3.5 Unless used in a special moment frame as permitted by 18.9.2.3, prestressing shall satisfy (a) through (d): (a) The average prestress fpc calculated for an area equal to the least cross-sectional...

As per code: (a) The average prestress fpc calculated for an area equal to the least cross-sectional dimension of the beam multiplied by the perpendicular cross-sectional dimension shall not exceed the lesser of 500 psi (3.5Mpa) and fc′/10. Some saying that this is not mandated by the code...

Hi, Just want to verify and seek your opinion regarding on the aci code for prestressed member. Is it the 500psi (3.5Mpa) and fc'/10 is the maximum precompression for the beam in high seismic zone? And for the special moment frame, Is it not allowed to terminate the prestressing steel before...

hi all, thanks for comments and opinion, i want to share my experimental analysis for the effects of live loads/sdl consideration in natural frequency for the vibration analysis. the said recommended value for the offices,residential etc, even if you use 15 kpa (full live load) have no...

Hi, I'm going to analyze concrete floor system with different loading. I want to know the effective mass for determining the natural frequency. As per AISC DESIGN GUIDE SERIES 11, a live loads of 11 psf and 6 psf are recommended for vibration analysis for typical office and residential...

rapt, Thanks for all your comments even though you didn't help or share any good idea regarding to the above subject. Maybe you are just a type of person that want to keep ideas/experience to himself. Anyway I already know how to analyze/design External PT for retrofitting. And like you, I have...

rapt, Yah.. I really admire the innovative engineers that develop the PT system even it is not prescribed on the codes on that time.. But now, we lived in the world with technology and advancement. If you will do a detailed design of hundreds or thousands of structural elements with just hand...

Ingenuity, Appreciated. Thank you very much. :)

Hi TehMightyEngineer, Thank you for your response. I want to verify some points on external post-tensioning. 1. Is allowable stresses in internal PT is same to the external PT? 2. Draped/parabolic tendon produce an uniform uplift in the member. For the harped tendon for the external pt...

hi rapt, I've practiced and studied PT design (internal only) that started this last 2 months only with the help of many guidelines and references. I can analyse it by manual calculation too. Actually I will design 2000 plus PT Girders/Beams that need to be finished at the end of Nov this year...

Hi, I'm a newbie here in this forum. Is anyone here can discuss how to calculate/design the external post tensioning with harped tendon for the retrofitting? Thank you.