ANALYSIS OF RELIABILITY CONFIDENCE LIMITS OF FATIGUE DAMAGE STRENGTH OF CONCRETE
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摘要: 以三参数Weibull概型为基础,结合大量C15混凝土试件的试验和某混凝土重力坝的原型观测反演结果,建立了描述高应力水平区域的混凝土在较低损伤量下低周疲劳强度的置信限分析模型,得到了具有给定置信度的疲劳强度、疲劳寿命和疲劳损伤三者间的关系曲线,γ-P-S-N 和γ-P-S-D 曲线.利用本文方法可方便地在给定置信限内计算混凝土在给定应力水平条件下的疲劳寿命、损伤量和剩余强度, 对混凝土做考虑损伤的可靠度设计,以及对已建结构进行可靠度评价.Abstract: Combining the fatigue experiments of C15 concrete specimen and the inversion results of a concrete gravity dam, a low-cycle fatigue strength model with low-damage quantity considering reliability confidence limits for the concrete is established based on the three-parameter Weibull distribution. The curves describing the relationships among the fatigue strength, fatigue life and damage quantity of the concrete, γ-P-S-N and γ-P-S-D, are obtained using the proposed confidence limit functions. The method proposed in the paper is useful for the reliability confidence analysis of the fatigue damage strength of the concrete subjected to a high stress level, the reliability design of the concrete strength with damage as well as the reliability assessment of a concrete structure.
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