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《建筑科学与工程学报》[ISSN:1673-2049/CN:61-1442/TU]

卷:

36卷

期数:

2019年06期

页码:

64-71

栏目:

出版日期:

2019-11-25

文章信息/Info

Title:

Effect of Gradient Temperature Difference on Crack Mechanism of Waterproof Slab Concrete

文章编号:

1673-2049(2019)06-0064-08

作者:

李潘武¹,胡明峰¹,李 伟¹,赵 鹏²

(1. 长安大学 建筑工程学院,陕西 西安 710061; 2. 陕西省建筑科学研究院有限公司,陕西 西安 710082)

Author(s):

LI Pan-wu¹, HU Ming-feng¹, LI Wei¹, ZHAO Peng²

(1. School of Civil Engineering, Chang'an University, Xi'an 710061, Shaanxi, China; 2. Shaanxi Architecture Science Research Institute Co., Ltd, Xi'an 710082, Shaanxi, China)

关键词:

防水板混凝土;  梯度温差;  温度应力;  抗拉强度;  裂缝

Keywords:

waterproof slab concrete;  gradient temperature difference;  temperature stress;  tensile strength;  crack

分类号:

TU48

DOI:

-

文献标志码:

A

摘要:

基于混凝土浇筑时防水板内外温度差异导致的温度应力对早期裂缝开展的影响,研究了防水板混凝土在施工期的温度应力性能,结合实际工程,总结了当防水板内外温度差异变化时混凝土裂缝损伤的情况。为了深入研究防水板混凝土开裂机理,用ANSYS进行数值模拟,根据防水板主拉应力计算分析公式得到梯度温差下的应力和变形云图。基于ANSYS云图分析结果,研究了混凝土结构的变形趋势、温度应力演变及裂缝分布情况。结果表明:在该联合基础过渡区域混凝土抵抗应力能力较弱,在云图中该处裂缝最早产生,裂缝蔓延速度更快; 防水板的第一应力值随着温差增大而增大,当浇筑温度越高时,混凝土结构所产生的温度应力越大; 在进行防水板施工阶段混凝土浇筑时,大温差导致防水板的大变形, 25 ℃左右为混凝土防水板结构开裂的临界温差。

Abstract:

Based on the influence of the temperature stress caused by the temperature difference between the inside and outside of the waterproof slab on the early crack development during the concrete pouring, the temperature stress performance of waterproof slab during construction period was studied. Combined with the actual project, when the temperature difference between the inside and outside of waterproof slab changed, the situation of concrete damage caused by cracks was summarized. In order to further study the crack mechanism of waterproof slab concrete, ANSYS numerical simulation was used to obtain the stress and deformation nephogram under the gradient temperature difference based on the calculation and analysis formula of the main tensile stress of waterproof slab. The ANSYS nephogram analysis results were adopted to study the deformation trend, temperature stress evolution and crack distribution of concrete structures. The results show that the resistance stress of concrete at the transition junction of the combined foundation is weak. In the nephogram, the first crack appears in this area and it spreads faster. The first stress value of waterproof slab increases with the increase of temperature difference. When the pouring temperature is higher, the temperature stress produced by concrete structure is higher. When concrete is poured in the construction stage of waterproof slab, the large temperature difference will lead to large deformation of waterproof slab. The critical temperature difference of cracking in concrete waterproof slab structure is about 25 ℃.

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相似文献/References:

备注/Memo

备注/Memo:

收稿日期:2019-01-07
基金项目:国家自然科学基金项目(51579013)
作者简介:李潘武(1963-),男,陕西西安人,副教授,工学博士,E-mail:panwuli@chd.edu.cn。

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更新日期/Last Update: 2019-11-26