The Analysis of Temperature Field of Concrete Beam of Hydration Heat

2014 ◽  
Vol 599-601 ◽  
pp. 179-182
Author(s):  
Xu Hui Yao
Keyword(s):  
Temperature Field ◽  
Reinforced Concrete ◽  
Concrete Beam ◽  
Early Stage ◽  
Hydration Heat ◽  
Box Girder ◽  
Time Histories ◽  
Concrete Box Girder ◽  
Action Process

This paper attempts to use the I-deas software to analysis the reinforced concrete box girder temperature field in early stage, focusing on the analysises under the action process of water thermal and reinforced concrete box girder variation law of temperature field under time histories.

3D Temperature Field Prediction and Experiment Verification of Concrete Diaphragm of Box-Girder Bridge in Early Hardening Period

2013 ◽  
Vol 671-674 ◽  
pp. 947-951
Author(s):  
Yi Shu Zhou ◽  
Jing Hong Liu
Keyword(s):  
Temperature Field ◽  
Early Stage ◽  
Prediction Method ◽  
Hydration Heat ◽  
Measured Temperature ◽  
Element Analysis ◽  
Box Girder ◽  
Box Girder Bridge ◽  
Girder Bridge ◽  
Temperature Field Prediction

Diaphragm is often used in box-girder bridge for controlling warping stress such those in midspan or transferring strong bearing reactions such those in ends of span. The results of a crack investigation of box-girder bridges showed that vertical cracks can be found on most diaphragms and formed in early stage of the concrete hardening. Temperature caused by hydration heat is an important factor for these cracking. Therefore temperature field prediction for the diaphragm is significant to prevent the concrete diaphragm cracking. In this paper, three-dimensional finite element analysis software ANSYS is used for simulating 3D temperature field of diaphragm of the concrete box girder bridge in all stages of construction. By calculating space temperature field of the diaphragm in different time hydration heat of the law is analyzed, combined with the measured temperature a comparative analysis to verify the validity of the temperature prediction method is conducted. The results show that simulation method is effective and accurate enough to predict the time-varying temperature field of the diaphragm.

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

A materially nonlinear finite element model for the analysis of curved reinforced concrete box-girder bridges

1993 ◽  
Vol 20 (5) ◽  
pp. 754-759 ◽  
Author(s):  
S. F. Ng ◽  
M. S. Cheung ◽  
J. Q. Zhao
Keyword(s):  
Finite Element ◽  
Reinforced Concrete ◽  
Finite Element Model ◽  
Element Model ◽  
Nonlinear Material ◽  
Box Girder Bridges ◽  
Box Girder ◽  
Girder Bridges ◽  
Concrete Box Girder ◽  
Concrete Box Girder Bridges

A layered finite element model with material nonlinearity is developed to trace the nonlinear response of horizontally curved reinforced concrete box-girder bridges. Concrete is treated as an orthotropic nonlinear material and reinforcement is modeled as an elastoplastic strain-hardening material. Due to the fact that the flanges and webs of the structure are much different both in configuration and in the state of stresses, two types of facet shell elements, namely, the triangular generalized conforming element and the rectangular nonconforming element, are adopted to model them separately. A numerical example of a multi-cell box-girder bridge is given and the results are compared favourably with the experimental results previously obtained. Key words: finite element method, curved box-girder bridges, reinforced concrete, nonlinear analysis.

Research of Temperature Field of Long Span Concrete Box Girder Bridge Caused by Solar Radiation

2012 ◽  
Vol 256-259 ◽  
pp. 1635-1639
Author(s):  
Cun Ren Jiang ◽  
Jian Min Ren ◽  
Zhuo Ling Wang
Keyword(s):  
Temperature Field ◽  
Temperature Gradient ◽  
Solar Radiation ◽  
Structure Design ◽  
Box Girder ◽  
Qinghai Province ◽  
Long Span ◽  
Concrete Box Girder ◽  
Girder Bridge ◽  
Bottom Slab

When stimulate temperature field of concrete box girder caused by solar radiation with ANSYS, it’s feasible to turn boundary conditions to third boundary condition. Taking Ping'an Huangshui River Super-large Bridge in Qinghai Province for example, the research analyzes box girder temperature field distribution and deduces realistic temperature gradient mode by comparing calculations with measurements. Calculations show that bottom slab of box girder also has quite big temperature gradient which should be taken seriously in bridge structure design.

scholarly journals Study on hydration heat of concrete channel-box girder

2020 ◽  
pp. 257-257
Author(s):  
Xiangnan Xiao ◽  
Yunyong Peng ◽  
Guijun Luo
Keyword(s):  
Tensile Strength ◽  
Temperature Field ◽  
Casting Process ◽  
Hydration Heat ◽  
Time Varying ◽  
Bridge Structure ◽  
Box Girder ◽  
Simply Supported ◽  
Concrete Shrinkage ◽  
Shrinkage And Creep

Temperature is one of the important reasons causing the cracks on the bridge structure during the construction and operation. In this paper, the temperature field produced by hydration heat and early thermal stress of a 64m simply supported channel-box girder are simulated during casting process, considering the time-varying characteristics of concrete shrinkage and creep, elastic modulus and tensile strength. Then, various parameters influencing the temperature field are analyzed, and the corresponding measures of controlling temperature cracks are proposed.

Sign in / Sign up

Export Citation Format

Share Document