钢筋混凝土轴心受压构件的非线性稳定性

Nonlinear stability of uniaxial compressive reinforced concrete members

采用我国混凝土规范GB50010-2002规定的混凝土应力-应变关系,考虑混凝土强度、构件长细比及混凝土徐变,从构件的非线性理论出发对钢筋混凝土轴心受压构件的承载力进行了研究,给出了混凝土构件临界状态时的构件边缘应变和纵向弯曲系数的计算公式。研究表明,徐变对轴心受压构件的承载力有很大影响。当不考虑混凝土徐变时,按本文公式计算的轴心受压构件的承载力比按规范公式计算的结果大,当考虑徐变的影响时,按本文公式计算的轴心受压构件的承载力比按规范公式计算的结果小。因此,需要进一步加强徐变对混凝土轴心受压承载力影响的研究。

Based on the relationship between stress and strain provisioned in ＂Code for design of concrete structures＂ （GB50010-2002） and taking concrete strength, slenderness ratio and concrete creep as study parameters, the bearing capacity of uniaxial compressive reinforced concrete members is studied from nonlinear theory＇s viewpoint and longitudinal bending coefficient in concrete critical state is obtained. It is indicated that the concrete creep has a significant effect on the bearing capa members. When concrete creep is not a factor, bearing capacity of uniaxially city of uniaxial compressed compressed members cornputed in this paper is greater than that in the standard, but is much smaller than that of the standard while it is a factor. Therefore, further studies should be made on the influence of creep to the bearing capacity of uniaxial compressive reinforced concrete member.