混凝土厚壁圆筒的极限分析

Limit analysis of concrete thick-walled tubes

作者曾建议利用破坏面的概念，建立一个抛物线旋转面的方程，作为复杂应力 状态下混凝土材料的强度准则。本文利用建议的强度准则，对厚壁圆筒的极限承载能力 作了分析，并与有关结果进行了比较。算例表明，与传统上采用的Ｍｉｓｅｓ准则或 Ｔｒｅｓｃａ准则的分析结果相比较，对于壁厚比较大时的厚壁圆筒，其承载能力相差很大； 由于建议的强度准则中考虑了材料强度参数的影响，所得结果更接近实际。

A parabolic revolving surface is proposed. as the failure surface of concrete, and a formula of the proposed surface is suggested as the strength criterion for concrete materials under multiaxial stresses. This paper gives the limit analysis with the suggested strength criterion, and compared with those results obtained with von Mises creterion or Tresca creterion. The results of the calculation example reveal that the maximum load bearing capacity of thick-walled tubes is very different when using the suggested strength criterion or using von Mises criterion (traditional limit analysis) for very thick thick-walled tubes, and the values obtained from the suggested criterion are closer to practice.