Full-range nonlinear analysis of post-tensioned anchorage zones based on modified strut-and-tie model

Structures ◽  
2022 ◽  
Vol 35 ◽  
pp. 565-576
Author(s):  
Linyun Zhou ◽  
Shui Wan
Keyword(s):  
Nonlinear Analysis ◽  
Full Range ◽  
Strut And Tie ◽  
Strut And Tie Model ◽  
Post Tensioned

scholarly journals Behavior predictions of deep beams with short straight bar anchorages using strut-and-tie models and nonlinear analysis

2016 ◽  
Vol 9 (5) ◽  
pp. 710-721
Author(s):  
R. A. SOUZA ◽  
S. BREÑA
Keyword(s):  
Nonlinear Analysis ◽  
Longitudinal Reinforcement ◽  
Deep Beams ◽  
Bond Slip ◽  
Crack Control ◽  
Strength Factor ◽  
Strut And Tie ◽  
Effective Strength ◽  
Laboratory Test Results ◽  
Strut And Tie Model

Abstract This paper investigates the laboratory test results of 12 deep beams available in the literature, where the longitudinal reinforcement was anchored into the support using short straight bar anchorages. Four different specimen groups with three different shear span-to-depth ratios (a/d) were selected and most of the deep beams failed by strut crushing after yielding of the main longitudinal reinforcement. In order to investigate the behavior of the selected deep beams, an enhanced strut-and-tie model assuming geometrical adaptability (possibility of update in the dimensions of the struts and ties as the main tie starts to yield) is proposed. The analytical results obtained using this approach may be considered as much as accurate than some conducted complex nonlinear analysis considering smeared fixed cracking model and bond-slip behavior. However, an improvement on the effective strength factor of bottle-shaped struts by means of an iterative strut-and-tie model is needed, once the effective strength factor prescribed by NBR6118 (2014) has shown to be over conservative for all ranges of span-to-depth ratio (a/d) investigated. Finally, the obtained results indicated that short bar anchorages did not seem to influence significantly the shear strength of the deep beams investigated, especially the strength of bottled-shaped struts when appropriate crack control reinforcement is present.

scholarly journals Reinforced concrete corbels strengthened with external prestressing

2019 ◽  
Vol 12 (4) ◽  
pp. 812-831 ◽  
Author(s):  
R. M. ROMANICHEN ◽  
R. A. SOUZA
Keyword(s):  
Reinforced Concrete ◽  
Nonlinear Analysis ◽  
Experimental Results ◽  
Analytical Models ◽  
Reinforced Concrete Structures ◽  
Structural Elements ◽  
Strut And Tie ◽  
External Prestressing ◽  
Strength Capacity ◽  
Strut And Tie Model

Abstract Reinforced concrete structures may demand, throughout their lifetime, the increase of the capacity load due to eventual changes in the load configuration. In this context, corbels could be considered structural elements which present great challenges for installing strengthening solutions. The referred difficulty is due to the fact that the strength capacity of this kind of element is dependent on the strength of a diagonal concrete strut and a tensile steel tie, both located in a very short region also subjected to interferences. In the present paper, the behavior of reinforced concrete corbels strengthened with external prestressing is investigated. For that, nonlinear analysis of short corbels (a/d ratio between 0,5 and 1,0), strengthened or not, have been applied. Also, analytical models based on the Strut-and-Tie Model were developed and the obtained results were compared with experimental results. The obtained results have demonstrated that strengthening reinforced concrete corbels using external prestressing is a fast, efficient and safe solution.

An analytical method for full-range mechanical behavior of continuous slab-deck in multi-span simply supported concrete bridges

2021 ◽  
pp. 136943322110427
Author(s):  
Xiang Zhang ◽  
Quan-Sheng Yan ◽  
Bu-Yu Jia ◽  
Zheng Yang ◽  
Ying-Hao Zhao ◽  
...  
Keyword(s):  
Nonlinear Analysis ◽  
Full Range ◽  
Scale Model ◽  
Axial Stiffness ◽  
Spring Model ◽  
Analysis Model ◽  
Rotational Spring ◽  
Simply Supported ◽  
Continuous Slab ◽  
Rotational Spring Model

Connecting the ends of girders with a continuous slab-deck to make a multiple-span simply supported girder bridge provides many benefits, but there is no suitable nonlinear analysis model which considers continuous slab-deck cracking under tension and bending. In this article, the rotational spring model is further refined to replace the restraining effects at both ends of the girder by the simplified mechanical model associated with axial stiffness, bending stiffness, and shear stiffness. Then, it is introduced into the analysis of continuous slab-deck. The more accurate rotations and displacements of both ends of continuous slab-deck are obtained to investigate the more precise moment and tension of the continuous slab-deck. Furthermore, this article presents an improved nonlinear analysis model of continuous slab-deck based on a detailed boundary rotational spring model. The displacements of important positions and the strain of key components in continuous slab-deck after cracking are investigated by numerical analysis and full-scale model test to verify the accuracy of the proposed nonlinear analysis model. The result shows that the nonlinear analysis model presented in this article could successfully evaluate the depth of cracks and the stress of rebars in continuous slab-deck, and it is instructional in predicting the cracking state of the continuous slab-deck and the reinforcement design.

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