Numerical Study of Damage Model for Reinforced Concrete Beam under Complex Boundary Condition Subjected to Air Blast Load

2014 ◽  
Vol 578-579 ◽  
pp. 757-761
Author(s):  
Dan Li ◽  
Jiang Tao Li ◽  
Jun Lin Tao
Keyword(s):  
Reinforced Concrete ◽  
Dynamic Response ◽  
Concrete Beam ◽  
Blast Loading ◽  
Reinforced Concrete Beam ◽  
Rc Beam ◽  
Simply Supported Beam ◽  
Simply Supported ◽  
Damage Morphology ◽  
Complex Boundary

Explicit FEM model ANSYS-DYNA is applied to simulate dynamic response and damage morphology of RC beam under blast loading. The dynamic response and damage morphology of reinforced concrete beam is analyzed under the different burst points, different explosive locations with the same proportion distance. The results show that: Under the same blast loading, the extent of damage of RC beam under complex boundary was lighter than the simply supported beam because of the stiffness contribution of slab and column. Acceleration at the half span point of the beam was 1/3 of simply supported beam, and the explosion shock attenuation was obvious.

Analysis on Factors that Affect the Damping of Reinforced Concrete Beam under Hammering Method

2011 ◽  
Vol 374-377 ◽  
pp. 2130-2133
Author(s):  
Da Peng Gu ◽  
Wei Ming Yan ◽  
Yan Jiang Chen ◽  
Hai Xia Zhou
Keyword(s):  
Reinforced Concrete ◽  
Parameter Identification ◽  
Concrete Beam ◽  
Reinforced Concrete Beam ◽  
Rational Method ◽  
Beam Model ◽  
Dynamic Experiment ◽  
Simply Supported Beam ◽  
Dynamic Behaviors ◽  
Simply Supported

Abstract. Damping, as one of the most important indicators of the structure’s dynamic behaviors, depicts how energy dissipates during vibration. Using Hammering Method on Reinforced Concrete Simply Supported Beam model dynamic experiment, by analyzing the vibrating signals captured during hammering process, how the allocation of the sensors and the hammer strength affect the parameter identification can be revealed. A rational method of parameter identification can be presented as well.

scholarly journals Toward Structural Health Monitoring of Civil Structures Based on Self-Sensing Concrete Nanocomposites: A Validation in a Reinforced-Concrete Beam

2021 ◽  
Vol 15 (1) ◽  
Author(s):  
Diego L. Castañeda-Saldarriaga ◽  
Joham Alvarez-Montoya ◽  
Vladimir Martínez-Tejada ◽  
Julián Sierra-Pérez
Keyword(s):  
Reinforced Concrete ◽  
Damage Detection ◽  
Direct Current ◽  
Health Monitoring ◽  
Electrical Resistance ◽  
Concrete Beam ◽  
Reinforced Concrete Beam ◽  
Structural Member ◽  
Rc Beam ◽  
Electric Resistance

AbstractSelf-sensing concrete materials, also known as smart concretes, are emerging as a promising technological development for the construction industry, where novel materials with the capability of providing information about the structural integrity while operating as a structural material are required. Despite progress in the field, there are issues related to the integration of these composites in full-scale structural members that need to be addressed before broad practical implementations. This article reports the manufacturing and multipurpose experimental characterization of a cement-based matrix (CBM) composite with carbon nanotube (CNT) inclusions and its integration inside a representative structural member. Methodologies based on current–voltage (I–V) curves, direct current (DC), and biphasic direct current (BDC) were used to study and characterize the electric resistance of the CNT/CBM composite. Their self-sensing behavior was studied using a compression test, while electric resistance measures were taken. To evaluate the damage detection capability, a CNT/CBM parallelepiped was embedded into a reinforced-concrete beam (RC beam) and tested under three-point bending. Principal finding includes the validation of the material’s piezoresistivity behavior and its suitability to be used as strain sensor. Also, test results showed that manufactured composites exhibit an Ohmic response. The embedded CNT/CBM material exhibited a dominant linear proportionality between electrical resistance values, load magnitude, and strain changes into the RC beam. Finally, a change in the global stiffness (associated with a damage occurrence on the beam) was successfully self-sensed using the manufactured sensor by means of the variation in the electrical resistance. These results demonstrate the potential of CNT/CBM composites to be used in real-world structural health monitoring (SHM) applications for damage detection by identifying changes in stiffness of the monitored structural member.

scholarly journals Numerical Derivation of Iso-Damaged Curve for a Reinforced Concrete Beam Subjected to Blast Loading

2018 ◽  
Vol 149 ◽  
pp. 02016 ◽  
Author(s):  
Yehya Temsah ◽  
Ali Jahami ◽  
Jamal Khatib ◽  
M Sonebi
Keyword(s):  
Finite Element ◽  
Reinforced Concrete ◽  
Shock Waves ◽  
Concrete Beam ◽  
Blast Loading ◽  
Reinforced Concrete Beam ◽  
Structural Elements ◽  
Finite Element Program ◽  
Element Program ◽  
Structural Engineers

Many engineering facilities are severely damaged by blast loading. Therefore, many manufacturers of sensitive, breakable, and deformed structures (such as facades of glass buildings) carry out studies and set standards for these installations to withstand shock waves caused by explosions. Structural engineers also use these standards in their designs for various structural elements by following the ISO Damage Carve, which links pressure and Impulse. As all the points below this curve means that the structure is safe and will not exceed the degree of damage based on the various assumptions made. This research aims to derive the Iso-Damage curve of a reinforced concrete beam exposed to blast wave. An advanced volumetric finite element program (ABAQUS) will be used to perform the derivation.

Shear Failure of Patched Reinforced Concrete Beam without Web Reinforcements

2017 ◽  
Vol 737 ◽  
pp. 441-447 ◽  
Author(s):  
Stefanus Kristiawan ◽  
Agus Supriyadi ◽  
Senot Sangadji ◽  
Hapsara Brian Wicaksono
Keyword(s):  
Reinforced Concrete ◽  
Concrete Beam ◽  
Shear Failure ◽  
Unsaturated Polyester ◽  
Reinforced Concrete Beam ◽  
Concrete Cover ◽  
Patch Repair ◽  
Rc Beam ◽  
Diagonal Crack ◽  
The Web

Degradation of reinforced concrete (RC) element could lead to a reduction of its strength and serviceability. The degradation may be identified in the form of spalling of concrete cover. For the case of RC beam, spalling of concrete cover could occur at the web of the shear span due to corrosion of the web reinfocements. The shear strength of the damaged-RC beam possibly will become less conservative compared to the corresponding flexural strength with a risk of brittle failure. Patch repair could be a choice to recover the size and strength of the damaged-RC beam. This research investigates the shear failure of patched RC beam without web reinforcements with a particular interest to compare the shear failure behaviour of patched RC beam and normal RC beam. The patch repair material used in this research was unsaturated polyester resin (UPR) mortar. The results indicate that the initial diagonal cracks leading to shear failure of patched RC beam occur at a lower level of loading. However, the patched RC beam could carry a greater load before the diagonal crack propagates in length and width causing the beam to fail in shear.

FE Analysis on the Structural Behavior of Reinforced Concrete Beam Damaged by Fire

2013 ◽  
Vol 351-352 ◽  
pp. 743-746
Author(s):  
Soo Yeon Seo ◽  
Yu Gun Chung
Keyword(s):  
Reinforced Concrete ◽  
Concrete Beam ◽  
Reinforced Concrete Beam ◽  
Fe Analysis ◽  
Structural Behavior ◽  
Rc Beam ◽  
Support Condition ◽  
Strength Deterioration ◽  
Simple Support ◽  
Analytical Result

This paper presents an analytical result about strength deterioration of reinforced concrete (RC) beams due to damage by fire. For the evaluation of the result, three RC beam specimens were made and two of those were exposed to fire. And then beam test was performed for those including non-heated specimen to evaluate the strength deterioration due to the fire damage under simple support condition. Strength decrease of materials due to the fire was evaluated through material test for concrete and reinforcements, respectively. Nonlinear Finite element (FE) analysis was performed by considering the decrease of materials due to fire. The analysis results showed that the structural behavior of fire-damaged RC beam was able to be simulated by using FE analysis with consideration of the reduction of material capacity due to fire.

scholarly journals Cracking Propagation and Pattern Behaviour of Irregular-Shaped Polyethylene Terephthalate Fibre Reinforced Concrete Beam

2015 ◽  
Vol 773-774 ◽  
pp. 911-915 ◽  
Author(s):  
J.M. Irwan ◽  
R.M. Asyraf ◽  
N. Othman ◽  
H.B. Koh ◽  
A.K. Aeslina ◽  
...  
Keyword(s):  
Reinforced Concrete ◽  
Polyethylene Terephthalate ◽  
Concrete Beam ◽  
Volume Fraction ◽  
Reinforced Concrete Beam ◽  
Rc Beam ◽  
Materials Properties ◽  
Tensile Strength Test ◽  
Structural Test ◽  
Polyethylene Terephthalate Fibre

This paper reports the results on cracking propagation and pattern of reinforced concrete (RC) beam conducted using irregular-shaped Polyethylene Terephthalate (IPET) as a fibre. Three volume fraction of IPET fibre is used namely, 0.5%, 1% and 1.5%. All RC beam specimens are tested under four point loading under flexural capacity behaviour. Prior to structural test, the materials properties which include the compressive and tensile strength test and modulus of elasticity test were determined. The results than are compared with control RC beam. It is found that the RC beam with IPET fibre does not significantly change the behaviour of failure mode, cracking propagation and pattern compared to control RC beam.

Effective Method of Repairing RC Beam Using Externally Bonded Steel Plate

2014 ◽  
Vol 567 ◽  
pp. 399-404 ◽  
Author(s):  
Md Ashraful Alam ◽  
Ali Sami Abdul Jabbar ◽  
Mohd Zamin Jumaat ◽  
Kamal Nasharuddin Mustapha
Keyword(s):  
Reinforced Concrete ◽  
Concrete Beam ◽  
Steel Plate ◽  
Reinforced Concrete Beam ◽  
Reinforced Concrete Beams ◽  
Steel Plates ◽  
Rc Beam ◽  
External Reinforcement ◽  
Externally Bonded ◽  
Damaged Beams

Repair of reinforced concrete beam with externally bonded steel plate or fibre reinforced polymer (FRP) laminate is becoming both environmentally and economically preferable rather than replacement of deficient beam. The well known advantages of external reinforcement over other methods include; low cost, ease of maintenance and the ability to strengthen part of the structure while it is still in use. The disadvantage of this method, however, is the premature debonding of the externally bonded strips which is brittle and undesired mode of failure. It is also known that debonding of the externally bonded steel plates prevents the reinforced concrete (RC) beam from reaching its full strengthening capacity. The aim of this study was to increase the scientific understanding on the behaviour of damaged reinforced concrete beams strengthened and/or retrofitted for shear using vertical steel plate fixed with adhesive and steel connectors to eliminate or delay debonding failure. Four reinforced concrete beam specimens were prepared to investigate the effects of connectors in preventing or delaying premature debonding of shear strips to restore the capacities of fully damaged beams. Three damaged beams have been repaired and strengthened with steel plates and loaded monotonically up to the maximum load capacities in order to define load–deflection relationship. It is concluded that the repairing of severely shear-damaged RC beams with steel plates by using steel and adhesive connectors can fully restore the original shear capacities of the beams.

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