10
D01:10. 7672/sgjs2014030010
施工技术
CONSTRUCTIONTECHNOLOGY
2014年2月上第43卷
第3期
天津高银117大厦底板内置钢筋网混凝土温度场及
应力场的仿真分析
李勇",2，管昌生，王辉”，余地华3，都全红”
（1.武汉理工大学土木工程与建筑学院，湖北武汉430070；2．黄淮掌院建筑工程学院，河南
463000：
驻马店
3.中建三局股份有限公司，湖北武汉430074）
[摘要】考虑到大体积混凝土内部常常分布有钢筋网、销栓等构件，运用ANSYS有限元软件，结合天津高银117大厦工程实例，对内置钢筋网大体积混凝土进行了温度场及应力场伤真分析，并对素混凝土和钢筋混凝土进行了对比分析。计算结果表明：钢筋网可以将内部混凝土产生的水化热传输到混凝土表面，钢筋混凝土的温度场要比素混凝土的温度场要小些，但相差不大；外部混凝土受拉，内部混凝土受压，拉应力由内到外依次增大；内部钢筋网受压，外部受拉；为了防止温度裂缝的出现，钢筋网一般布置在混凝土表面附近且要加密，而内部不布置或很少布置钢筋网。
【关键词】高层建筑；混凝土；钢筋；水化热；温度场；裂缝
【中图分类号】TU974
【文献标识码］A
【文章编号】1002-8498（2014)03-0010-04
Simulation Analysis of Temperature Field and Stress Field of
Built-in MeshReinforcement Concrete Floor in Tianjin Gaoyin117Building
LiYong'2,Guan Changsheng',Wang Hui',Yu Dihua',DuQuanhong
(1. School of Civil Engineering and Arehitecture, Wuhan University of Technology, Wuhan, Hubei 430070, China; 2. School of Civil Engineering and Architecture, Huanghuai Unisersity, Zhumadian, He'nan463000, China 3. China Construction Third Enginneering Buregu Joint-stock Co, ,Lad., Wuhan, Hubei 430074, Chine)
Abstract: Considering the large volume concrete intermnal often having mesh reinforcement, anchor bolt components, using finite element sofware ANSYS, combined with 117 building engineering project, the temperature field and stress field simulation analysis of the large volume concrete built in mesh reinforcement, and the compared analysis of the plain concrete and reinforced concrete were given by this paper. The calculation results show that steel fabric can transmit hydration heat produced by the internal concrete to concrete surface, and the temperature field of reinforced concrete is smaller than plain concrete, but little difference existed; External concrete tension, internal concrete compression, tension stress in turn increase from inside to outside; Intermal steel fabric compression, the external tension, in order to prevent the emergence of the temperature cracks, mesh reinforcement general is arranged in the concrete near the surface and encryption, and mesh reinforcement not arranged or rarely arranged in the internal concrete.
Key words:tall buildings; concrete; reinforcement; hydration heat; temperature field; cracks
.
引言
随着国民经济的持续高速发展，超高层建筑结构层出不穷。无论基础底板还是上部楼板，都会广驻马店市科技攻关计划项目：精细化施工与混凝土高性能指标实现的研究（13222）
【作者简介】李勇，副教授，E-mail；1012946062@q9cem
【收稿日期】2013-04-15 万方数据
泛应用大体积混凝土。大体积混凝土的水化热反应使热量在其内部积聚，极易造成内外温差过大，使得在混凝土内外交界处产生温度应力"，当应力超过混凝土的极限应力时，就会出现温度裂缝（2-3] 关于大体积混凝土温度应力及裂缝的研究，在国外，Tervola等对箱形连续梁温度场理论进行了研究并得出混凝土内部温度场是呈非线性分布的结