钢筋对混凝土徐变影响的计算

Calculation of Concrete Creep with consideration of influence of Reinforcement Bars

钢筋在荷载作用下的变形时效性与混凝土不同,这便在一定程度上改变了混凝土的徐变。因此,为了尽可能精确地计算混凝土的徐变,必须考虑钢筋的影响。从力学角度出发,钢筋混凝土构件与相同尺寸的素混凝土构件在相同的荷载作用下,两者的变形差异是由钢筋对混凝土的附加内力导致的。根据混凝土徐变计算公式以及相应的力平衡条件与位移协调条件,可以推导出考虑钢筋影响的混凝土徐变计算公式。此外,文章还以实例验证了公式的正确性。

Because of the time-effectiveness of deformations for concrete and steel bar, under the same loading, is defferent, so the creep of concrete will be changed to a certain extent by the reinforcing bars. In order to accurately calculating the creep, it is necessary to consider the influence nf reinforcing bars. In fact, the different deformations of concrete with and without steel bar is caused by the additional internal force between reinforcing bars and concrete. And based on that the force is in equilibrium, and the deformation is in coordination, the method of creep calculation in this article is deduced