配筋混凝土粘弹性参数的徐变试验研究

为了便于分析配筋混凝土结构的粘弹性温度应力，本文将配筋混凝土看作为一种复合材料，通过试验来测定该材料的粘弹性参数。文中采用三分点加载的方式进行了配筋混凝土小梁的室内徐变试验，并对试验数据进行了回归分析。结果表明：1. 用配筋混凝土小梁的徐变试验来测定配筋混凝土材料的粘弹性参数是可行的；2. 荷载历史是徐变减小的重要原因，在计算温度应力时，徐变系数取值要考虑这一因素；3. 在本试验配筋条件下，配筋对徐变影响很小，配筋混凝土的徐变系数与素混凝土的徐变系数近乎相等。

CREEP TEST ON VISCOELASTIC PARAMETERS OF REINFORCED CONCRETE BEAM

In order to study the viscoelastic thermal stresses in reinforced concrete structures, which is regarded as a kind of composite materials, the viscoelastic parameters of reinforced concrete are measured experimentally. The method of three-point loading was used in the creep test of the reinforced concrete beam. The recurrent analysis of experiment results is also conducted. It is shown that: 1. The method for measuring the viscoelastic parameters of reinforced concrete is effective; 2. The loading history must be considered in choosing the creep coefficient in thermal stress calculation, for it is an important effect on decrease of creep; 3. In this experiment condition, reinforcement has little influence on creep, and creep coefficient of reinforced concrete almost equals that of pure concrete.