scholarly journals New Approach for Simulating Reinforced Concrete Walls in Quasi-static Loading

2020 ◽  
Vol 6 (12) ◽  
pp. 2352-2362
Author(s):  
S. Benakli ◽  
Y. Bouafia ◽  
M. Oudjene ◽  
K. Benyahi ◽  
A. Hamri
Keyword(s):  
Reinforced Concrete ◽  
Static Loading ◽  
Effective Area ◽  
Point Of View ◽  
Concrete Wall ◽  
Concrete Walls ◽  
Reinforced Concrete Walls ◽  
Reinforced Concrete Wall ◽  
The Law ◽  
Matlab Programming

The main objective of this article is to apply a simplified model to simulate the overall behavior of a reinforced concrete wall without the need to explicitly represent the reinforcing bars in the model nor the progressive degradations of the concrete in tension. The model takes into account the fictitious laws of the material, in order to estimate the capacity of the studied model and its performance to simulate the complex behavior of concrete. The law of the fictitious behavior of reinforced concrete tie rods is based on the shape of the adhesion curve between steel and concrete. Relationships covering the cracking stage up to the elastic limit of steel are proposed according to the properties of concrete and steel materials, the percentage of steel. An analytical computational model is then implemented in the Matlab programming language. Necessary transformations for the integration of the law of fictitious average behavior of steel in the Abaqus software were carried out thus making it possible to make a considerable advance from the point of view of validation of the developed law. The general formulation of the tension law applies to sections where the reinforcements are distributed so that the resistance of the entire section is mobilized. Hence the need to introduce an effective area around the rebars for the application of the fictitious tension law to reinforced concrete walls. Numerical simulations have been validated using an example of reinforced concrete wall subjected to a quasi-static loading. Load-displacement responses are compared and the numerical results approaches well the experimental one. By using the law of the fictitious diagram of the concrete and by defining the effective tensile zone of the wall, the model makes it possible to save a considerable time of calculation compared to a traditional calculation in EF on Abaqus. Doi: 10.28991/cej-2020-03091622 Full Text: PDF

scholarly journals Floors number influence on the instability parameter of reinforced concrete wall- or core-braced buildings

2013 ◽  
Vol 6 (5) ◽  
pp. 783-796 ◽  
Author(s):  
R. J. Ellwanger
Keyword(s):  
Reinforced Concrete ◽  
Analytical Study ◽  
Concrete Structures ◽  
Concrete Wall ◽  
Concrete Walls ◽  
Order Analysis ◽  
Reinforced Concrete Walls ◽  
Continuous Models ◽  
Reinforced Concrete Wall ◽  
Instability Parameter

This work aims to investigate the floors number influence on the instability parameter limit α1 of buildings braced by reinforced concrete walls and/or cores. Initially, it is showed how the Beck and König discrete and continuous models are utilized in order to define when a second order analysis is needed. The treatment given to this subject by the Brazilian code for concrete structures design (NBR 6118) is also presented. It follows a detailed analytical study that led to the derivation of equations for the limit α1 as functions of the floors number; a series of examples is presented to check their accuracy. Results are analyzed, showing the precision degree achieved and topics for continuity of research in this field are indicated.

scholarly journals Study on Radiation Shielding Performance of Reinforced Concrete Wall After the Earthquake

2010 ◽  
Vol 5 (4) ◽  
pp. 361-368
Author(s):  
Keiji Sekine ◽  
◽  
Yoshinari Munakata ◽  
Osamu Kontani ◽  
Koji Oishi ◽  
...  
Keyword(s):  
Reinforced Concrete ◽  
Nuclear Power ◽  
Radiation Shielding ◽  
Crack Model ◽  
Concrete Wall ◽  
Concrete Walls ◽  
Reinforced Concrete Walls ◽  
Earthquake Resistant ◽  
Reinforced Concrete Wall ◽  
Large Earthquakes

The structure in which radioactive substances are stored and handled must be earthquake resistant. We will be confirming radioactive shielding performance of reinforced concrete walls when cracks occur due to large earthquakes. In this study, we performed horizontal loading experiments to evaluate shielding performance of earthquake resisting walls and constructed a safety crack model. Next, the shielding calculation was done by using the crack model, and the shielding performance of the earthquake resisting wall was evaluated. As a result, if the structure is designed according to the standards outline for nuclear power related facility, and an earthquake causes cracks in an earthquake resisting wall, it was shown that if the thickness of the earthquake resisting wall was less than 80 cm, the decrease in shielding performance was very small, and that the radiation exposure on the general public and the employee was negligible.

Experimental study and numerical model calibration of full-scale superimposed reinforced concrete walls with I-shaped cross sections

2016 ◽  
Vol 19 (12) ◽  
pp. 1902-1916 ◽  
Author(s):  
Xun Chong ◽  
Linlin Xie ◽  
Xianguo Ye ◽  
Qing Jiang ◽  
Decai Wang
Keyword(s):  
Experimental Data ◽  
Reinforced Concrete ◽  
Numerical Model ◽  
Seismic Performance ◽  
Cross Sections ◽  
Concrete Wall ◽  
Concrete Walls ◽  
Reinforced Concrete Walls ◽  
Wall Panels ◽  
Reinforced Concrete Wall

The superimposed reinforced concrete wall in which both the walls and slabs are semi-precast superimposed reinforced concrete components has been widely used to construct high-rise residential buildings in some seismic regions of China. This article aims to investigate the seismic performance and reveal the inherent damage mechanism of this wall. Quasi-static tests of two full-scale superimposed reinforced concrete walls with I-shaped cross sections, consisting of the walls in orthogonal directions and two T-shaped cast-in-place boundary elements, were conducted. Through the test, the behavior of the horizontal joints between the wall panels and the foundation; the behavior of the vertical connections between the wall panels of orthogonal direction; the reliability of the connections between precast and cast-in-place concrete; and the lateral load, deformation, and energy dissipation capacities of the specimens are evaluated. In addition, a refined numerical model based on the multi-spring model was adopted to assess the seismic performance of the superimposed reinforced concrete walls with I-shaped cross sections. The reliability of this model was validated through comparison with the experimental data. This study offers valuable experimental data and numerical model references for future seismic performance assessments of superimposed reinforced concrete wall structures.

Insulation Type Effect on the Direct Shear Behavior of Concrete Sandwich Panel (CSP) with Non-Shear Connectors

2013 ◽  
Vol 663 ◽  
pp. 154-158 ◽  
Author(s):  
Tae Sik Oh ◽  
Seok Joon Jang ◽  
Kang Min Lee ◽  
Hyun Do Yun
Keyword(s):  
Reinforced Concrete ◽  
Sandwich Panel ◽  
Residential Buildings ◽  
Precast Concrete ◽  
Test Results ◽  
Concrete Wall ◽  
Concrete Walls ◽  
Shear Connectors ◽  
Reinforced Concrete Walls ◽  
Pull Out

Precast concrete sandwich panels (PCSP) are often used as exterior cladding of residential buildings due to thermal efficiency. PCSP systems consist of two precast reinforced concrete walls separated by a layer of insulation and connected with connectors which penetrate the insulation layer and are anchored at two precast walls. This paper provides the pull-out test results of concrete sandwich panel (CSP) with non-shear connectors. The variables in this study were the casting direction of reinforced concrete walls and types of insulation. Test results indicated that the types of insulations and casting direction have a significant effect on the bond strength between concrete wall and insulation. The effect of insulation type is notable for CSP cast horizontally concrete walls.

SEISMIC ASSESSMENT OF NON-DUCTILE REINFORCED CONCRETE C-SHAPED WALLS

2015 ◽  
Vol 2 (1) ◽  
Author(s):  
Ryan D. Hoult ◽  
Helen M. Goldsworthy ◽  
Elisa Lumantarna
Keyword(s):  
Reinforced Concrete ◽  
Ductile Failure ◽  
Shear Capacity ◽  
Point Of View ◽  
Building Stock ◽  
Concrete Walls ◽  
Reinforced Concrete Walls ◽  
Displacement Capacity ◽  
Capacity Model ◽  
Moderate Seismic Regions

Buildings that rely on reinforced concrete walls and cores as their primary lateral loading system are prevalent in much of Australia’s building stock. Capacity design principles do not have to be adhered to in most low-to-moderate seismic regions, such as Australia. Consequentially, the level of detailing typically provided in accordance with the current and past concrete material standards, AS 3600 and AS 1480, is regarded as non-ductile from the seismic design point of view. These non-ductile reinforced concrete elements have been known to perform poorly when subjected to large lateral loads, as observed in the Christchurch earthquake in 2011. This paper presents an investigation into the seismic performance of C-shaped reinforced concrete walls acting as a core of a Mid-Rise building using current and past building codes in Australia. The displacement capacity of the building was calculated using a displacement-based assessment. A shear capacity model, which is a function of the curvature ductility of the walls, was also considered in the assessment. The results indicate that the older building is likely to fail in shear in the event of a 1000-year return period earthquake event. The building designed to current standards is vulnerable to a non-ductile failure from premature fracturing of the longitudinal reinforcing steel bars.

scholarly journals Soft Missile Impact on Shear Reinforced Concrete Wall

2010 ◽  
Vol 5 (4) ◽  
pp. 426-436 ◽  
Author(s):  
Arja Saarenheimo ◽  
◽  
Kim Calonius ◽  
Markku Tuomala ◽  
Ilkka Hakola ◽  
...  
Keyword(s):  
Reinforced Concrete ◽  
Transverse Shear ◽  
Shear Failure ◽  
Three Dimensional ◽  
Concrete Wall ◽  
Concrete Walls ◽  
Shell Elements ◽  
Bending Mode ◽  
Reinforced Concrete Wall ◽  
Wall Deformation

In developing numerical approaches for predicting the response of reinforced concrete structures impacted on by deformable projectiles, we predict structural behavior collapse and damage using simple analysis and extensive nonlinear finite element (FE)models. To verify their accuracy, we compared numerical results to experimental data and observations on impact-loaded concrete walls with bending and transverse shear reinforcement. Different models prove adequate for different cases and are sensitive to different variables, making it important to rely on more than a single model alone. For wall deformation in bending mode, deflection is predicted reasonably well by simple four-node shell elements. Where punching dominates, transverse shear behavior must be considered. Formation of a shear failure cone is modeled using three-dimensional solid elements.

Analysis of Sound Insulation Performance of Reinforce Concrete Walls between Households According to Wall Thickness Criteria in Apartments

2017 ◽  
Vol 873 ◽  
pp. 237-242
Author(s):  
Hye Kyung Shin ◽  
Kyoung Woo Kim ◽  
A Yeong Jeong ◽  
Kwan Seop Yang
Keyword(s):  
Reinforced Concrete ◽  
Wall Thickness ◽  
Field Measurements ◽  
Reinforce Concrete ◽  
Sound Insulation ◽  
Concrete Wall ◽  
Minimum Thickness ◽  
Concrete Walls ◽  
Reinforced Concrete Wall ◽  
Insulation Performance

Sound insulation between households is properly ensured to provide a quiet residential environment in apartments. The legal requirements for sound insulation in apartments in Korea are set to meet the wall’s minimum thickness or sound insulation performance. When construction companies choose the walls that satisfy thethickness in the standards of boundary walls between households, it is difficult to know the sound insulation performance. In this study, the sound insulation performance of reinforced concrete walls is predicted according to the wall thickness criteria and analyzed through field measurements. In newly built apartments, the reinforced concrete wall’s sound insulation performance(R'w) is 56 – 66 dB, which is a similar level of the international criterion. And the sound insulation performance of the reinforced concrete wall according to thickness standards is similar to sound insulation performance standardsof Korea.

scholarly journals Design of reinforced concrete walls casted in place for the maximum normal stress of compression

2014 ◽  
Vol 7 (3) ◽  
pp. 498-533
Author(s):  
T. C. Braguim ◽  
T. N. Bittencourt
Keyword(s):  
Reinforced Concrete ◽  
Structural Analysis ◽  
Numerical Model ◽  
Normal Stress ◽  
Concrete Wall ◽  
Concrete Walls ◽  
Maximum Normal Stress ◽  
Reinforced Concrete Walls ◽  
Wall System ◽  
Simple Numerical Model

It is important to evaluate which designing models are safe and appropriate to structural analysis of buildings constructed in Concrete Wall system. In this work it is evaluated, through comparison of maximum normal stress of compression, a simple numerical model, which represents the walls with frame elements, with another much more robust and refined, which represents the walls with shells elements. The designing of the normal stress of compression it is done for both cases, based on NBR 16055, to conclude if the wall thickness initially adopted, it is enough or not.

scholarly journals Analysis of the effects of soil-structure interaction in reinforced concrete wall buildings on shallow foundation

2018 ◽  
Vol 11 (5) ◽  
pp. 1076-1109
Author(s):  
M. G. C. SANTOS ◽  
M. R. S. CORRÊA
Keyword(s):  
Reinforced Concrete ◽  
Soil Structure ◽  
Soil Heterogeneity ◽  
Shallow Foundation ◽  
Soil Structure Interaction ◽  
Concrete Wall ◽  
Structural Walls ◽  
Concrete Walls ◽  
Structure Interaction ◽  
Reinforced Concrete Wall

Abstract This paper presents a study of the effects caused by soil-structure interaction in reinforced concrete wall building on shallow foundation. It was verified the influence of displacements of supports on the redistribution of internal forces in the structural walls and in the redistribution of loads on the foundation. The superstructure was represented by shell finite elements and the soil-structure interaction was evaluated by iterative methods that consider the stiffness of the building, the soil heterogeneity and the group effect of foundation elements. An alternative model that considers the soil-structure interaction is adopted and the concrete walls are simulated by bar elements. The results indicate that the soil-structure interaction produces significant changes of the stress flow, with larger influences on the lower walls, as well as a tendency of settlements standardization and load migration to supports with smaller settlements.

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