混凝土构件裂缝控制的可靠度分析模式

Reliability Analysis Model for Crack Control of Concrete Members

本文基于可靠度理论研究了混凝土构件抗裂和限制裂缝宽度的失效模式。阐述了对使用极限状态设计基准期的选取及其相应的荷载效应组合的建议；提出了混凝土构件三种抗裂尺度条件下可靠度分析的一般原则以及考虑混凝土早期开裂对抗裂可靠度模式的影响；将裂缝宽度与荷载效应之间的关系视作随机函数，在以短期裂缝宽度为依据并考虑长期增长的物理模式基础上，建立了任意裂缝宽度分布及裂缝宽度极大值分布的密度函数，给出了失效概率公式。

Based on the reliability theory,the failure models for crack resistance and crackwidth limitation of concrete members have been studied Suggestions for the selection of design reference period in serviceability limit state and the appropriate combination of load actioneffects were madeThe general principle for reliability analysis of concrete member under the condition of three kinds of crack magnitude was presented With the effect of concrete cracking at early stage on reliability analysis model for crack resistance considered and the relationship between crackwidth and load actioneffects regarded as a stochastic function, on the basis of a physical model, which basically takes the shortterm crackwidth with the longterm increase in crackwidth considered the density functions for arbitrary crackwidth distribution and Maximum value distribution of crackwidth have been established, then the failure probability formula is given in this paper