| 摘要: |
| 以均质连续介质为假设建立高强混凝土多孔介质徐变数值模型，分析不同双轴应力组合对徐变效应的影响，以获得高强混凝土在双轴应力状态下的徐变发展规律，同时开展高强混凝土双轴徐变试验论证.计算结果和试验结果均表明徐变系数和应力状态密切相关，双轴应力状态下混凝土徐变系数小于单轴应力状态，且竖向应力对徐变系数影响较大；在试验和计算条件下，180 d双轴应力状态的徐变系数分别为相应单轴状态的73%和90%左右. |
| 关键词: 高强混凝土 双轴徐变 数值模拟 试验验证 |
| DOI： |
| 分类号:TU528.31 |
| 基金项目:国家863计划资助项目(2007AA112106)；交通运输部西部交通建设科技项目(200631822327)；中央级公益性科研院所基本科研业务费专项资金项目（Y411009） |
|
| Numerical simulation for creep of high strength concrete and its experimental verification |
|
TANG Yun-qing1, KE Min-yong1, LI Xiao-lin2, LIU Hai-xiang1
|
|
1.Research Center on New Materials in Hydraulic Structures of Ministry of Water Resources， Nanjing Hydraulic Research Institute;2.Hohai University
|
| Abstract: |
| To understand creep development law of high strength concrete in civil engineering， and discuss the impacts of stress combination on concrete creep， based on the assumption of a homogeneous continuous medium， a numerical model of porous medium for the concrete creep is established and verification of biaxial creep experiments are carried out. The research results show that the creep coefficient is closely correlated with stress status of samples; and the creep coefficient of biaxial stress status is smaller than that of a single stress status and highly effected by the vertical stress； and the creep coefficients for 180 days of computation and experiment results with the biaxial stress status are about 75% and 90% of those with the single stress status respectively. Construction quality of prestress in the course of construction of prestressed concrete structures must be well controlled, as an increase in the creep coefficients could be induced by the loss of prestress. |
| Key words: high strength concrete biaxial creep numerical simulation experimental verification |
