Soft Missile Impact on Shear Reinforced Concrete Wall

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.

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

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.873.237 ◽

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.

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

Revista IBRACON de Estruturas e Materiais ◽

10.1590/s1983-41952013000500006 ◽

2013 ◽

Vol 6 (5) ◽

pp. 783-796 ◽

Cited By ~ 2

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.

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

Journal of Disaster Research ◽

10.20965/jdr.2010.p0361 ◽

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.

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

Revista IBRACON de Estruturas e Materiais ◽

10.1590/s1983-41952018000500010 ◽

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

Advances in Structural Engineering ◽

10.1177/1369433216649392 ◽

2016 ◽

Vol 19 (12) ◽

pp. 1902-1916 ◽

Cited By ~ 7

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.

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

Civil Engineering Journal ◽

10.28991/cej-2020-03091622 ◽

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

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Laser Scanning Supporting Graving Dock Retrofit

10.5957/smc-2005-p14 ◽

2005 ◽

Author(s):

Gregory F. Morea ◽

Nellichery Thiyagarajan

Keyword(s):

Reinforced Concrete ◽

Efficient Method ◽

Laser Scanning ◽

Three Dimensional ◽

Surface Model ◽

Cad Model ◽

3D Laser Scanning ◽

Post Processing ◽

Concrete Wall ◽

Reinforced Concrete Wall

In July 2004, Electric Boat Corporation decided to retrofit Graving Dock 3 at its Groton, Connecticut shipyard with a reinforced concrete wall designed and constructed to replace the existing cellular cofferdams that comprise the dock. Since the cofferdams are of various heights and have deflected in different ways over the years, an efficient method was needed to capture the as-built configuration of the graving dock before design of the wall could be finalized. The owner, design agent and contractor chose a combination of 3D laser scanning, post processing, and CAD modeling to capture this as-built condition. The resulting three dimensional CAD surface model of the dock became integral with the design of the wall and its construction. This paper will provide an overview of the reasons laser scanning was chosen and a description of how the laser scans were taken and processed. The paper will also discuss how a CAD model was created from the processed data, and more significantly, how the model was used in the development of design and construction drawings. The paper will conclude with a look at how 3D laser scanning is being used on other projects at Electric Boat, for both shipbuilding and facilities.

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