Serviceability performance of prestressed concrete buildings taking into account long-term behavior

2012 ◽  
Author(s):  
Hing-lun Yip
Keyword(s):  
Prestressed Concrete ◽  
Concrete Buildings ◽  
Long Term Behavior

Long-Term Behavior of CFRP Prestressed Concrete Beams

PCI Journal ◽  
2003 ◽  
Vol 48 (2) ◽  
Author(s):  
Abass Braimah ◽  
Mark F. Green ◽  
Khaled A. Soudki
Keyword(s):  
Prestressed Concrete ◽  
Concrete Beams ◽  
Long Term Behavior

scholarly journals Modified PCI Multipliers for Time-Dependent Deformation of PSC Bridges

2018 ◽  
Vol 2018 ◽  
pp. 1-13
Author(s):  
Joo-Ha Lee ◽  
Kwang-Mo Lim ◽  
Chan-Gi Park
Keyword(s):  
Numerical Analysis ◽  
Prestressed Concrete ◽  
Time Factors ◽  
Current Situation ◽  
Time Dependent ◽  
Bridge Design ◽  
Long Time ◽  
Long Term Behavior ◽  
Construction Schedules

Nowadays prestressed concrete (PSC) bridges have become very common, but there are still many difficulties in predicting their long-term behavior. In order to predict the long-term behavior of PSC bridges, it is possible to use very complex formulas developed by various researchers or numerical analysis through computer, but many engineers are having difficulty in using such methods. Moreover, the accuracy of the prediction result is not satisfactory compared to the effort. On the contrary, the PCI Bridge Design Manual proposes a method that can easily predict the long-term behavior using multipliers. However, this method does not take into account various construction schedules and has some assumptions that are inadequate for the current situation in various girder sections and topping thicknesses. Therefore, in this study, new long-time factors were developed by modifying the multipliers of the PCI Bridge Design Manual by a rational manner. This allows prediction of long-term behavior of bridges taking into account various construction schedules and the characteristics of modern girder sections. The prediction results of the long-term camber and deflection of PSC bridges using the proposed multipliers were compared with those using the basic PCI Bridge Design Manual, the improved PCI Bridge Design Manual, KR C-08090 (same as ACI 318-14), and numerical analysis. As a result, the newly proposed method makes possible to predict the long-term behavior at any time after casting, and the accuracy of the prediction is also improved.

scholarly journals Pre-Stress Losses in FRP Pre-Stressed Reinforced Concrete – Subject Overview

2018 ◽  
Vol 64 (4) ◽  
pp. 257-268
Author(s):  
M. Przygocka ◽  
R. Kotynia
Keyword(s):  
Reinforced Concrete ◽  
Prestressed Concrete ◽  
Experimental Tests ◽  
Fiber Reinforced Polymers ◽  
Prestress Losses ◽  
Rc Structures ◽  
Concrete Members ◽  
Frp Reinforcement ◽  
Long Term Behavior

AbstractFiber reinforced polymers (FRPs) due to their specific high-strength properties become more and more popular and replace traditional structural materials like conventional steel in prestressed concrete structures. FRP reinforced structures are relatively new when compared to structures prestressed with steel tendons. For that reason only several studies and applications of pre-tensioned FRP reinforcement have been conducted until now. Moreover, researchers only considered short-term behavior of FRP reinforced concrete members. The precise information about long-term behavior of FRP reinforcement is necessary to evaluate the prestress losses, which should be taken into account in the design of prestressed RC structures. One of the most important factor influencing long term behavior of FRP reinforcement is stress relaxation. The overview of experimental tests results described in the available literature considering the prestress losses obtained in FRP prestressed concrete members is presented herein.

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