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对经典突变理论进行延伸,提出了一种新的、适用于准脆性介质的突变理论,认为结构非线性失稳源自于自身本构关系。将新提出的突变理论应用到桩基工程,对灌注混凝土端承桩的破坏机制进行了探索,明确了端承桩的失效模式为失稳破坏模式,并给出了其失稳的数学、力学判据和承载力计算公式。以两个实际工程为例,将理论值与实测值进行比较,二者吻合较好。鉴于灌注混凝土端承桩延性、脆性破坏难以区分的实际情况,该文同时给出了端承桩延性破坏和脆性破坏的界定标准,并提出了相应的工程建议。
Extending the classical catastrophe theory, a new catastrophe theory for quasi-brittle medium is proposed, which considers that the nonlinear instability of structure comes from its own constitutive relation. The newly proposed catastrophe theory is applied to pile foundation engineering to explore the failure mechanism of perfusion concrete bearing pile. It is clear that the failure mode of the end bearing pile is instability failure mode, and its instability mathematical, mechanics Criterion and bearing capacity calculation formula. Taking two actual projects as an example, the theoretical value and the measured value are compared, the two agree well with each other. In view of the fact that the ductility and brittle failure of perforated concrete piles are indistinguishable from each other, the definition criteria of ductile failure and brittle failure of end-bearing piles are given, and corresponding engineering suggestions are put forward.