An Analysis of the Calculation of the Temperature Field of the Reinforced Concrete Beam under the High Temperature of Fire

2013 ◽  
Vol 405-408 ◽  
pp. 2299-2304
Author(s):  
Man Li Ou ◽  
Wei Jun Cao ◽  
Fang Cheng Liu
Keyword(s):  
Temperature Field ◽  
Reinforced Concrete ◽  
High Temperature ◽  
Cross Section ◽  
Concrete Beam ◽  
Reinforced Concrete Beam ◽  
Structure Study ◽  
Temperature Fields ◽  
Element Analysis ◽  
Heat Transfer Theory

Under the high temperature of fire, the temperature change of the reinforced concrete beam is very important to the structure study. This paper, with heat transfer theory as its theoretical basis, explores the analytical method, the common method for analysis, calculation method of numerical value and finite element analysis by analyzing the temperature field of the concrete component cross sections under high temperature. With the help of MATLAB, it calculates and analyzes the temperature field of the reinforced concrete beam under the high temperature of fire, determines the temperature rise curve of the reinforced concrete beam in case of fire, and calculates the cross section temperature fields of the beam or pillar under the circumstances of different cross section sizes and different timings of fire on three sides.

scholarly journals Procedure for determining the thermoelastic state of a reinforced concrete bridge beam strengthened with methyl methacrylate

2021 ◽  
Vol 4 (7(112)) ◽  
pp. 26-33
Author(s):  
Vitalii Kovalchuk ◽  
Yuliya Sobolevska ◽  
Artur Onyshchenko ◽  
Olexandr Fedorenko ◽  
Oleksndr Tokin ◽  
...  
Keyword(s):  
Temperature Field ◽  
Reinforced Concrete ◽  
Methyl Methacrylate ◽  
Concrete Beam ◽  
Vertical Direction ◽  
Reinforced Concrete Beam ◽  
Temperature Stresses ◽  
Temperature Changes ◽  
Structural Reinforcement ◽  
Elasticity Module

This paper reports the analysis of methods for determining temperature stresses and deformations in bridge structures under the influence of climatic temperature changes in the environment. A one-dimensional model has been applied to determine the temperature field and thermoelastic state in order to practically estimate the temperature fields and stresses of strengthened beams taking into consideration temperature changes in the environment. The temperature field distribution has been determined in the vertical direction of a reinforced concrete beam depending on the thickness of the structural reinforcement with methyl methacrylate. It was established that there is a change in the temperature gradient in a contact between the reinforced concrete beam and reinforcement. The distribution of temperature stresses in the vertical direction of a strengthened reinforced concrete beam has been defined, taking into consideration the thickness of the reinforcement with methyl methacrylate and the value of its elasticity module. It was established that the thickness of the reinforcement does not have a significant impact on increasing stresses while increasing the elasticity module of the structural reinforcement leads to an increase in temperature stresses. The difference in the derived stress values for a beam with methyl methacrylate reinforcement with a thickness of 10 mm and 20 mm, at elasticity module E=15,000 MPa, is up to 3 % at positive and negative temperatures. It has been found that there is a change in the nature of the distribution of temperature stresses across the height of the beam at the contact surface of the reinforced concrete beam and methyl methacrylate reinforcement. The value of temperature stresses in the beam with methyl methacrylate reinforcement and exposed to the positive and negative ambient temperatures increases by three times. It was established that the value of temperature stresses is affected by a difference in the temperature of the reinforced concrete beam and reinforcement, as well as the physical and mechanical parameters of the investigated structural materials of the beam and the structural reinforcement with methyl methacrylate

Temperature Field Analysis of Steel Reinforced Concrete Column in Fire

2013 ◽  
Vol 351-352 ◽  
pp. 615-618 ◽  
Author(s):  
Jian Hua Chen ◽  
Chao Ma ◽  
Jian Hua Li ◽  
Qin Qian
Keyword(s):  
Temperature Field ◽  
Reinforced Concrete ◽  
High Temperature ◽  
Field Analysis ◽  
Concrete Column ◽  
Distribution Law ◽  
Reinforced Concrete Column ◽  
Element Analysis ◽  
Steel Reinforced Concrete ◽  
Nice Agreement

In order to analyze the mechanical properties of the remaining carrying capacity of steel reinforced concrete columns after exposure to fire, full preparations must be needed. In this paper, the numerical simulation of the temperature field of steel reinforced concrete column section was being adopted the finite element analysis software MSC.MARC to analyze. Temperature distribution law of the column cross-section in the case of uneven fire was obtained. There has a nice agreement between calculation and original test data which created the conditions for high temperature and high temperature performance analysis for SRC columns

scholarly journals A NONLINEAR FINITE ELEMENT ANALYSIS OF PRECAST INDUSTRIALISED BUILDING SYSTEM BEAM UNDER FLEXURAL TEST

2019 ◽  
Vol 81 (3) ◽  
Author(s):  
Chun-Chieh Yip ◽  
Jing-Ying Wong ◽  
Ka-Wai Hor
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Reinforced Concrete ◽  
Concrete Beam ◽  
Failure Modes ◽  
Reinforced Concrete Beam ◽  
Shear Cracks ◽  
Flexural Test ◽  
Element Analysis ◽  
Failure Behaviour

Software simulation enables design engineers to have a better picture of possible structural failure behaviour and determine the accuracy of a design before the actual structural component is fabricated. Finite element analysis is used to simulate the behaviour of the reinforced concrete beam under the flexural test. During the flexural test, results are recorded for both simulation and experimental tests. By comparing the results, beam displacement, crack patterns, and failure modes can be studied with better accuracy. The accuracy percentage for yield load and ultimate load between the two tests results were 94.12 % and 95.79 %, respectively, whereas the accuracy percentage for elastic gradient before the yielding stage was 81.08 %. The behaviour between simulation and laboratory models described is based on crack pattern and failure mode. The progression of von Mises (VM) stresses highlighted the critical areas of the reinforced concrete beam and correlation between the experimental specimen, in terms of flexural cracks, shear cracks, yielding of tension reinforcement, and the crushing of concrete due to compressive stress. This paper concludes that simulation can achieve a significant accuracy in terms of loads and failure behaviour compared to the experimental model.

Research on Reinforced Concrete Beam Enlarged Cross Section Method Experiment and Finite Element Simulation

2014 ◽  
Vol 638-640 ◽  
pp. 208-213 ◽  
Author(s):  
Yuan Yuan Li ◽  
Bin Guo ◽  
Jiang Liu
Keyword(s):  
Finite Element ◽  
Reinforced Concrete ◽  
Finite Element Simulation ◽  
Cross Section ◽  
Concrete Beam ◽  
Performance Test ◽  
Bending Strength ◽  
Reinforced Concrete Beam ◽  
Reinforced Concrete Beams ◽  
Element Simulation

Increasing the beam cross section is a kind of traditional and universal strengthening methods of civil structure. The mechanical performance test were studied on the mechanics performance and deformation of four reinforced concrete beams in this study. The results show that increase of the cross section and tensile area at the bottom of the steel could effectively improve the performance of mechanical. The beam crack load, yield load, ultimate load and bending strength are increasing with cross section and mechanical. By simulating the relationship bwteen load and deflection. It is concluded that The finite element simulation of reinforced concrete beam with the reasonable concrete unit and reinforced unit can meet the demand of practical engineering.

Study on Impaired Reinforced Concrete Beams Strengthening with Externally Steel Frame

2013 ◽  
Vol 438-439 ◽  
pp. 477-481
Author(s):  
Feng Lan Li ◽  
Xiong Huai Yu ◽  
Cheng Chen ◽  
Song Chen
Keyword(s):  
Reinforced Concrete ◽  
Cross Section ◽  
Concrete Beam ◽  
Steel Plate ◽  
Reinforced Concrete Beam ◽  
Steel Frame ◽  
Reinforced Concrete Beams ◽  
Test Results ◽  
Externally Bonded ◽  
Strengthening Method

A large impaired reinforced concrete beam with cracks was strengthened under self-weight action by the externally bonded steel frame composed with bottom steel plate and side hoop steel belts. The normal service loading behaviors of this beam were tested to verify the effectiveness of this strengthening method specified in current Chinese design code. Based on the analyses of test results, it can be concluded that: the deformation of flexural cross section of this beam fitted the assumption of plain cross section, the steel plate could effectively enhance the flexural stiffness and decrease the deflection of this beam, no new cracks appeared under the normal service loads, the cracks at bottom of this beam were more confined by the steel frame than those at web zone. Therefore, other measure should be taken to avoid the opening of web cracks.

Finite Element Analysis on Flexural Fatigue Behavior of RC Beams Strengthened with CFRP

2012 ◽  
Vol 446-449 ◽  
pp. 3062-3065
Author(s):  
Yu Wang ◽  
Yan Ni Shen ◽  
Xu Fan
Keyword(s):  
Reinforced Concrete ◽  
Fatigue Life ◽  
Concrete Beam ◽  
Fatigue Behavior ◽  
Reinforced Concrete Beam ◽  
Rc Beams ◽  
Element Analysis ◽  
Bending Fatigue ◽  
Practical Engineering ◽  
Numerical Simulation Methods

Numerical simulation methods were used in this paper , and the bending fatigue performance of reinforced concrete beam with CFRP by ANSYS were analyzed . the Fatigue Mechanism was studied , and obtained the raise the level of fatigue life of reinforced concrete beam with CFRP .The result shows CFRP can increase greatly its fatigue life and play a practical engineering guide.

scholarly journals The damage analysis of the reinforced concrete beam and the prestressed reinforced concrete beam

2018 ◽  
Vol 157 ◽  
pp. 02055
Author(s):  
Milan Vaško ◽  
Marián Handrik ◽  
Matej Rác ◽  
Vladislav Baniari ◽  
Ján Kortiš ◽  
...  
Keyword(s):  
Reinforced Concrete ◽  
Concrete Beam ◽  
Material Model ◽  
Reinforced Concrete Beam ◽  
Reinforced Concrete Beams ◽  
Elastoplastic Material ◽  
Damage Analysis ◽  
Element Analysis ◽  
The Finite Element Analysis ◽  
Non Linear

The paper deals with the finite-element analysis of damage in reinforced concrete beam and prestressed reinforced concrete beam. The steel reinforcement is modeled using non-linear rebar elements and an elastoplastic model of the reinforcement is considered. The initial prestress is defined in the ropes that are used to create the prestressed reinforced concrete beam. These ropes are also modeled using non-linear rebar elements and the elastoplastic material model. Created computational model allows the damage modeling of the reinforced and pre-stressed reinforced concrete beams under static loading.

Nonlinear Analysis of Reinforced Concrete Beam by ANSYS

2013 ◽  
Vol 438-439 ◽  
pp. 663-666
Author(s):  
Xin Zhong Zhang ◽  
Lei Lei Liu ◽  
Ke Dong Tang
Keyword(s):  
Reinforced Concrete ◽  
Nonlinear Analysis ◽  
Concrete Beam ◽  
Reinforced Concrete Beam ◽  
Experimental Results ◽  
Analysis Software ◽  
Element Analysis ◽  
Ansys Analysis ◽  
The Finite Element Analysis ◽  
Calculation Results

This paper mainly uses ANSYS, the finite element analysis software, to make nonlinear analysis of reinforced concrete beam. The model simulating the test process was established, the calculation results of ANSYS are compared with the experimental results. The comparison shows that ANSYS analysis results are similar to experimental results, which indicates ANSYS analysis software can be used to simulate the mechanical property of reinforced concrete structures.

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