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为了解决混凝土管片极限承载能力分析问题,提出了4种弯矩和轴力组合作用下混凝土管片计算模型.基于钢筋的弹塑性本构模型和梁截面应变相似准则,推导了混凝土管片极限承载能力的解析表达式.以北京地铁四号线盾构区间为例,研究了轴力对混凝土管片极限承载能力的影响.计算结果表明,混凝土受压区高度、受压区钢筋应力和混凝土管片极限承载能力都随着轴力的增加而增加.混凝土管片极限承载力与轴力近似为线性关系.采用有限元方法模拟了混凝土的承载力特性.研究表明,解析模型计算结果与有限元模拟值基本一致,验证了提出的解析计算模型的准确性.
In order to solve the problem of ultimate bearing capacity analysis of concrete segments, four kinds of calculation models of concrete segments under the combination of bending moment and axial force are proposed.Based on the elastic-plastic constitutive model of reinforced concrete and the similarity criterion of beam cross-section strain, the limit of concrete segments Taking the shield section of Beijing Metro Line 4 as an example, the influence of axial force on the ultimate bearing capacity of concrete segments is studied. The calculated results show that the height of concrete compression zone, The ultimate bearing capacity of the piles increases with the increase of the axial force.The ultimate bearing capacity of the concrete piles is approximately linear with the axial force.The bearing capacity of the concrete is simulated by the finite element method.The results show that the calculated results of the analytical model are limited Meta-simulation values are basically the same, which verifies the accuracy of the proposed analytical model.