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钢筋混凝土受压构件的计算,大都属于中柔度稳定问题的范畴,迄今还没有一种计算方法可以应用于这一目的,并能直接求出临界应力。本文对上述问题进行了研究和探讨,并结合某发电厂212米烟囱在施工阶段有关稳定性计算(除考虑其中柔度稳定问题外)所涉及的荷载分布与支承条件等进行了应用研究。文中提出了用“割线模量法”来计算中柔度稳定问题,并给出了计算钢筋混凝土在弹性极限外的中柔度受压构件的临界应力。
The calculation of reinforced concrete compression members mostly belongs to the category of stability problem of mid-flexibility, and so far there is no calculation method that can be applied to this purpose, and the critical stress can be obtained directly. This article has carried on the research and the discussion to the above question, and has carried on the applied research to the load distribution and the supporting condition that the 212 meters chimney of a power plant in the construction phase relates to the stability calculation (except to consider the softness stability problem) involved. This paper proposes the use of secant modulus method to calculate the stability of mid-flexibility, and gives the critical stress of the mid-flexibility compressive members for the calculation of reinforced concrete outside the elastic limit.