考虑长径比和容许沉降影响的群桩SLS可靠度分析

发布时间：2018-07-03 02:07

  本文选题：群桩 + 可靠度　； 参考：《中南大学学报(自然科学版)》2016年11期

【摘要】：考虑桩正常使用极限状态(SLS)和承载能力极限状态(ULS)模型不确定性,利用概率统计理论,给出2种极限状态下单桩可靠度指标间的线性关系式。并结合群桩ULS可靠度分析方法,提出群桩SLS可靠度评估方法。最后,利用试桩资料,研究桩长径比(L/D)和容许沉降(slt)对群桩SLS可靠度分析结果的影响。研究表明:L/D对群桩SLS可靠度影响显著。无黏性土条件下,当L/D≤10或20L/D≤30时,都可取得较大的群桩SLS可靠度指标;黏性土条件下,当20L/D≤30时,可取得较大的群桩SLS可靠度指标。随slt的增加,估计的群桩SLS可靠度指标逐渐增大,但增大幅度逐渐减小,特别是当slt大于25 mm以后,随slt的增加,群桩SLS可靠度指标变化很小,此时承载力因素在桩基可靠度设计中起决定作用。
[Abstract]:Considering the uncertainty of the limit state of pile (SLS) and the limit state of bearing capacity (ULS), the linear relationship between the reliability index of the two kinds of limit states is given by using the theory of probability and statistics. Combined with the ULS reliability analysis method of pile group, the SLS reliability evaluation method of pile group is put forward. Finally, the effects of L- / D ratio and allowable settlement (slt) on the reliability analysis of pile groups are studied by means of pile test data. The results show that the effect of W / L / D on the SLS reliability of pile group is significant. When L / D 鈮，

本文编号：2091903