|Table of Contents|

Finite element simulation of inside-outside temperature gradient and thermal stress for abutment mass concrete(PDF)

《交通运输工程学报》[ISSN:1671-1637/CN:61-1369/U]

Issue:
2016年02期
Page:
18-26,36
Research Field:
道路与铁道工程
Publishing date:

Info

Title:
Finite element simulation of inside-outside temperature gradient and thermal stress for abutment mass concrete
Author(s):
SUN Zeng-zhi1 TIAN Jun-zhuang1 SHI Qiang2 LIU Wei2 CHEN Hua-xin1 XU Qin-wu3 ZHANG Ben1
1. School of Materials Science and Engineering, Chang’an University, Xi’an 710064, Shaanxi, China; 2. Ordos Wanli Bridge Group Co., Ltd., Ordos 017000, Inner Mongolia, China; 3. The Transtec Group, Austin 78731, Texas, USA
Keywords:
material engineering mass concrete temperature field thermal stress numerical analysis crack
PACS:
U443.2
DOI:
-
Abstract:
Aimed at the earlier temperature cracks of mass concrete during construction, a 3D finite element model of mass concrete was built based on the abutment of Laoshangou Highway Bridge in Inner Mongolia, and the effects of content of fly ash, pouring temperature, environmental temperature, and maintenance measure on central temperature, temperature difference between inside and outside, and surface tensile stress of abutment were analyzed. Simulation result shows that the surface tensile stress of concrete increases with the content decrease of fly ash, the decline increases when the content exceeds 30%, and the central temperature, the temperature difference between inside and outside, and the surface tensile stress decrease with the increasse of adding dosage of fly ash, so effective adding fly ash can reduce the hydration heat of concrete and prevent the occurrence of cracks due to the surface temperature difference. When the pouring temperature increases from 5 ℃ to 30 ℃, the highest central temperature of concrete increases from 40.3 ℃ to 58.1 ℃, the maximum temperature difference between inside and outside increases from 8.6 ℃ to 19.0 ℃, and the maximum tensile stress increases from 0.93 MPa to 1.66 MPa. The highest central temperature of concrete and the maximum temperature difference between inside and outside appear in advance, and the surface tensile stress increases linearly along with the increase of pouring temperature. The temperature difference between inside and outside and the surface tensile stress decrease with the increase of environmental temperature, and the relationship between the surface tensile stress and the environmental temperature is linear basically. The better curing condition is, the smaller the temperature difference between inside and outside is, the slower the increase speed of surface tensile stress is, the later the occurred time of maximum surface tensile stress is, which are beneficial to control the cracks. 1 tab, 31 figs, 23 refs.

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Last Update: 2016-04-20