scholarly journals Tension stiffening approach for deformation assessment of flexural reinforced concrete members under compressive axial load

2019 ◽  
Vol 20 (6) ◽  
pp. 2056-2068 ◽  
Author(s):  
Pui‐Lam Ng ◽  
Viktor Gribniak ◽  
Ronaldas Jakubovskis ◽  
Arvydas Rimkus
Keyword(s):  
Reinforced Concrete ◽  
Axial Load ◽  
Tension Stiffening ◽  
Concrete Members ◽  
Compressive Axial Load

Analysis of Shear-critical reinforced concrete columns under variable axial load

2022 ◽  
pp. 1-24
Author(s):  
Dimitrios K. Zimos ◽  
Panagiotis E. Mergos ◽  
Vassilis K. Papanikolaou ◽  
Andreas J. Kappos
Keyword(s):  
Reinforced Concrete ◽  
Axial Load ◽  
Shear Failure ◽  
Progressive Collapse ◽  
Full Range ◽  
Element Model ◽  
Independent Verification ◽  
Lateral Response ◽  
Proposed Model ◽  
Compressive Axial Load

Older existing reinforced concrete (R/C) frame structures often contain shear-dominated vertical structural elements, which can experience loss of axial load-bearing capacity after a shear failure, hence initiating progressive collapse. An experimental investigation previously reported by the authors focused on the effect of increasing compressive axial load on the non-linear post-peak lateral response of shear, and flexure-shear, critical R/C columns. These results and findings are used here to verify key assumptions of a finite element model previously proposed by the authors, which is able to capture the full-range response of shear-dominated R/C columns up to the onset of axial failure. Additionally, numerically predicted responses using the proposed model are compared with the experimental ones of the tested column specimens under increasing axial load. Not only global, but also local response quantities are examined, which are difficult to capture in a phenomenological beam-column model. These comparisons also provide an opportunity for an independent verification of the predictive capabilities of the model, because these specimens were not part of the initial database that was used to develop it.

scholarly journals Repair of Fire-Damaged Reinforced Concrete Members with Axial Load: A Review

2019 ◽  
Vol 11 (4) ◽  
pp. 963 ◽  
Author(s):  
Jun Zhou ◽  
Lu Wang
Keyword(s):  
Reinforced Concrete ◽  
Residual Strength ◽  
Axial Load ◽  
Common Knowledge ◽  
Structural Safety ◽  
Experimental Investigations ◽  
Great Loss ◽  
Concrete Members ◽  
Reinforced Polymer ◽  
Structural Fires

It is common knowledge that structural fires have led to a great loss of buildings and damage to property in the past two decades. Therefore, there is a growing need to provide approaches for post-fire repair of structural members to enhance their structural safety. This paper presents a state-of-the-art review on the repair of fire-damaged reinforced concrete (RC) members with axial load. The investigations into the effects of loading method, physical dimension and bonding behavior on the residual strength of members are presented. In the meantime, the available experimental investigations on the performance of fire-damaged RC members with axial load repaired with concrete jacketing, steel jacketing and fiber-reinforced polymer (FRP) jacketing are summarized. Moreover, models for predicting the residual strength of fire- damaged columns are reviewed.

scholarly journals ELASTIC-PLASTIC FRACTURE ANALYSIS OF STRUCTURAL COLUMNS

2006 ◽  
Vol 12 (2) ◽  
pp. 181-186 ◽  
Author(s):  
Abdesselam Zergua ◽  
Mohamed Naimi
Keyword(s):  
Reinforced Concrete ◽  
Cross Sections ◽  
Correlation Study ◽  
Flow Rule ◽  
Elastic Plastic ◽  
Concrete Members ◽  
Proposed Model ◽  
Compression Region ◽  
Frame Work ◽  
Compressive Axial Load

This research is achieved in the general frame‐work of the study of the concrete behaviour. It has for objective the development of a numerical tool able to predict the behaviour of reinforced concrete columns with circular and square cross‐sections under an increasing compressive axial load. The concrete behaviour is assumed as elastic‐plastic model with an associated flow rule in compression region and as elastic with tension stiffening behaviour in the tension region. Two yield surfaces have been taken into account according to the Drucker‐Prager and Rankine failure criterions. However, the reinforcing steel is assumed as an elastic strain hardening model. A finite element method using solid cube elements for concrete, and bar elements for the reinforcement have been used. Correlation study between numerical and experimental results is conducted with the objective to establish the validity of the proposed model and identify the significance of the transverse reinforcement volumetric ratio effect on the response of reinforced concrete members. Good agreement has been observed in comparing these results.

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