| 黄达海.大体积混凝土拆模后表层温度的Fourier震荡[J].计算力学学报,2004,21(2):154~158 |
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| 大体积混凝土拆模后表层温度的Fourier震荡 |
| Fourier vibration of massive concrete by demolding |
| 修订日期：2002-08-31 |
| DOI：10.7511/jslx20042029 |
| 中文关键词: Fourier震荡 混凝土 拆模 表面保护 脉冲时间 温度边界 温度响应 |
| 英文关键词:concrete,demolding,surface protection,Fourier vibration |
| 基金项目:中国博士后科学基金项目，教育部"985"项目，湖北省自然科学基金项目(2001ABB098). |
| 黄达海 |
| 北京航空航天大学土木系,北京100083 |
| 摘要点击次数: 1153 |
| 全文下载次数: 10 |
| 中文摘要: |
| 将大体积混凝土拆模后很快予以保护的过程简化为大气温度的线性脉冲。研究了脉冲时间对Fourier震荡的影响。成果可以解释混凝土温度在边界层的不合理现象，指出了修正Fourier震荡的途径。 |
| 英文摘要: |
| Because of increasing demands on concrete durability, more and more attentions are paid on damage mechanics on the surface of early-age concrete, in which temperature change is one of the most dangerous environmental factor that should be discussed. In this paper, a simplified numerical model of massive concrete is applied to simulate the temperature process by move out the molds (demolding) from solidified concrete and covering it with heat insulated material. According to Fourier heat conduction law, when the formwork of concrete is demolded, heat, generated by cement, would flow from inner part of concrete to outside, and almost every point would has the same flow speed. And when the outside boundary is covered with heat insulated material, the heat flow would be hold back suddenly, and the Fourier vibration would be found in the internal part. As a matter of fact, temperature vibration in concrete is impossible, especially for the part far away from the boundary. So, some thing is misunderstood. Through analytical method, the reason is discovered and the relationship between disturbed time and Fourier vibration impact is presented, which indicates that Fourier vibration can be used to explain the false response phenomenon. At last, an approach to eliminate Fourier vibration is suggested. |
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