| 摘要: |
| 为了定量研究椭圆环试验约束度，采用数值分析方法，通过对混凝土施加虚拟温度场来模拟其收缩作用，计算了椭圆环试件中混凝土在自由收缩和限制收缩条件下的位移，分析了混凝土壁厚、钢环厚度和混凝土弹性模量对椭圆环试验约束度的影响，并拟合得到椭圆环试验约束度计算表达式.通过对比椭圆环混凝土的开裂时间后发现，预测结果与试验结果吻合良好，验证了所提出的数值分析方法的可行性.最后针对不同约束度条件下的早龄期混凝土，进行了约束圆环和椭圆环试验设计. |
| 关键词: 限制收缩 开裂时间 约束度 数值分析 |
| DOI：10.3969/j.issn.1007 9629.2017.02.020 |
| 分类号: |
| 基金项目:国家自然科学基金资助项目（51478083,51109026） |
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| Theoretical Research on the Degree of Restraint and Experimental Design in the Restrained Shrinkage Elliptical Ring Test |
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DONG Wei, LUO Hao, WANG Fulu, WU Zhimin
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State Key Laboratory of Coastal and Offshore Engineering, Dalian University of Technology, Dalian 116024, China
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| Abstract: |
| In order to quantify the degree of restraint in the restrained elliptical ring， a numerical analysis method was adopted to simulate concrete shrinkage under restrained condition through applying fictitious temperature field on concrete. The free shrinkage and restraint shrinkage displacements at concrete inner boundary along the major axial of elliptical were derived to calculate the degree of restraint. The effects of concrete ring thickness， steel ring thickness and concrete elastic modulus on degree of restraint were discussed. In addition， the formula of degree of restraint for elliptical ring specimen was fitted based on the numerical results. The concrete cracking time based on the numerical analysis was in reasonable agreement with the experimental result， which verified the numerical method. Finally， a design approach of restrained ring test was recommended to assess crack resistance of concrete structural under various degrees of restraint. |
| Key words: restrained shrinkage cracking time degree of restraint numerical analysis |
