Reliability-based inspection of post-tensioned concrete slabs

1996 ◽  
Vol 23 (1) ◽  
pp. 242-249 ◽  
Author(s):  
M. D. Pandey ◽  
M. A. Nessim
Keyword(s):  
Prestressed Concrete ◽  
Cost Effective ◽  
Bayes Theorem ◽  
Concrete Slabs ◽  
Design Code ◽  
Annual Probability ◽  
Key Words Reliability ◽  
Incremental Strategy ◽  
Existing Structure ◽  
Post Tensioned

In unbonded, post-tensioned prestressed concrete slabs and beams, corrosion of prestressed tendons due to moisture ingress and their subsequent breakage has been identified as a major problem raising serious concern over the safety of aged structures. The paper presents a practical Bayesian approach to reliability assessment of such structures based on the inspection of a randomly selected sample of prestressing tendons. To minimize inspection costs, clear guidelines are presented for selecting the minimum sample size necessary to demonstrate that the annual probability of failure of an existing structure is below the target value of 10−5, implied in the Canadian Standards Association concrete design code CAN3-A23.3-M84. A systematic and cost-effective incremental strategy is developed for inspection of existing prestressed concrete structures. Key words: reliability, Bayes theorem, prestressed concrete, unbonded post-tensioned system, inspection, corrosion, probability distribution, CSA Standard CAN3-A23.3-M84, slab.

Pretensioned Prestressed Concrete Slabs for the Vienna Airport

PCI Journal ◽  
1961 ◽  
Vol 6 (1) ◽  
pp. 48-59
Author(s):  
Bruno Freibauer
Keyword(s):  
Prestressed Concrete ◽  
Concrete Slabs

STUDY ON ANCHORAGE ZONE STRESS DISTRIBUTION OF THE POST-TENSIONED PRESTRESSED CONCRETE MEMBERS : Part I: Two-Dimensional Investigations

1957 ◽  
Vol 55 (0) ◽  
pp. 43-51
Author(s):  
Shizuo Ban ◽  
Hiroshi Muguruma ◽  
Zen-ichi Ogaki ◽  
Teruo Terasawa
Keyword(s):  
Stress Distribution ◽  
Prestressed Concrete ◽  
Two Dimensional ◽  
Concrete Members ◽  
Post Tensioned

Corrosion of anchorage head system of post-tensioned prestressed concrete structures under chloride environment

2017 ◽  
Vol 18 (6) ◽  
pp. 902-913 ◽  
Author(s):  
Fumin Li ◽  
Xiaoya Luo ◽  
Zhenguo Liu
Keyword(s):  
Prestressed Concrete ◽  
Concrete Structures ◽  
Chloride Environment ◽  
Post Tensioned

Experimental study of the post tensioned prestressed concrete corbels

2016 ◽  
Vol 108 ◽  
pp. 1-11 ◽  
Author(s):  
Małgorzata Lachowicz ◽  
Krystyna Nagrodzka-Godycka
Keyword(s):  
Experimental Study ◽  
Prestressed Concrete ◽  
Post Tensioned

Failure by corrosion in PC bridges: a case history of a viaduct in Italy

2016 ◽  
Vol 7 (2) ◽  
Author(s):  
Piero Colajanni ◽  
Antonino Recupero ◽  
Giuseppe Ricciardi ◽  
Nino Spinella
Keyword(s):  
Prestressed Concrete ◽  
Design Methodology ◽  
Progressive Collapse ◽  
Numerical Analyses ◽  
Existing Structures ◽  
History Of ◽  
Progressive Collapse Analysis ◽  
Practical Implications ◽  
Post Tensioned

Purpose The paper illustrates a viaduct collapse due to corrosion phenomena. Moreover, a contribution to the issues related to both the control of existing structures and design methods to be followed for the construction of new buildings is provided. Design/methodology/approach The objectives were achieved by in situ observations and numerical analyses. The effects of corrosion phenomena are investigated, and the progressive collapse analysis is provided to be helpful in this case. Findings The damages induced by corrosion phenomena have caused the collapse of the viaduct taken in to account. The performed numerical analyses were able to reproduce the effects of corrosion in terms of reduction of wires diameter. Research limitations/implications The research is limited to prestressed concrete viaduct with post-tensioned cables. Practical implications A monitoring plan, subdivided in several phases, is suggested, to avoid critical situations as these described. Originality/value The case study brought useful information on the effects of corrosion on the decks section, showing how the technology in post-tensioned cables is usually insidious and prone to the issues relating to corrosion of the wires

THE PUNCHING RESISTANCE OF PRESTRESSED CONCRETE SLABS.

1986 ◽  
Vol 81 (3) ◽  
pp. 489-490
Author(s):  
PE REGAN ◽  
DJ CLELAND ◽  
AE LONG
Keyword(s):  
Prestressed Concrete ◽  
Concrete Slabs

Numerical investigation on load transfer mechanism of bonded post-tensioned concrete beam-column substructures against progressive collapse

2020 ◽  
pp. 136943322098165
Author(s):  
Kai Qian ◽  
Hai-Ning Hu ◽  
Yun-Hao Weng ◽  
Xiao-Fang Deng ◽  
Ting Huang
Keyword(s):  
Prestressed Concrete ◽  
Load Transfer ◽  
Numerical Models ◽  
Progressive Collapse ◽  
Load Resistance ◽  
Catenary Action ◽  
Parabolic Profile ◽  
Arch Action ◽  
Column Removal Scenario ◽  
Post Tensioned

This paper presents the high-fidelity finite-element-based numerical models for modeling the behavior of prestressed concrete (PC) beam-column substructures to resist progressive collapse under column removal scenario. After careful calibration against data, the validated numerical models are further employed to shed light on the influence of bonded post-tensioned tendons (BPT) with a parabolic profile on the load transfer mechanisms of PC frames against progressive collapse. The effects of parameters, including initial effective prestress, profile of tendon and lateral constraint stiffness at the beam ends, are also investigated. The study shows that, due to the presence of prestressed tendons, the mobilization of compressive arch action in the beam at small deflections demands stronger lateral constraints, and the ultimate load resistance of PC beam-column substructures depends on combined catenary action from non-prestressed reinforcement and BPT at large deflections. For a given constraint stiffness, the initial effective prestress of BPT has less significant effect on the overall structural behavior. For prestressed tendon, a straight profile usually employed in structural strengthening can improve the initial structural stiffness and yield strength, but is less effective in enhancing the ultimate resistance against progressive collapse than the parabolic profile.

Nonlinear Analysis of Prestressed Concrete Slabs

1983 ◽  
Vol 109 (7) ◽  
pp. 1742-1760 ◽  
Author(s):  
Johannes Van Greunen ◽  
Alexander C. Scordelis
Keyword(s):  
Nonlinear Analysis ◽  
Prestressed Concrete ◽  
Concrete Slabs
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