横向应变对复合材料加固木柱极限承载力计算分析*-建筑结构

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横向应变对复合材料加固木柱极限承载力计算分析*

袁书成，梁危，王清远，朱艳梅

摘要: (四川大学能源工程安全与灾害力学教育部重点实验室，成都 610065)

[摘要] 针对现在大量仿古建筑的出现，以及汶川地震后很多木结构出现轻微破坏，需要加固维修,木材运用到建筑结构中的情况越来越多。采用AFRP纤维布加固7根短方木柱，探讨短方木柱的破坏形式。考察全包、间隔包裹、纤维层数对木柱性能的影响。试验表明：加固后木柱的承载力、刚度和延性均得到提高，在所有试件中全包2层AFRP试件的承载力及变形性能提高最大。随着纤维层数的增加，承载力提高与包裹层数之间不是正比关系，加固层数增加到3层承载力提高幅度开始下降。并且纤维复合材料加固木柱并不能改变木柱脆性破坏的形式。在所有试件中，由于其中一跟木柱有木结存在，所以其承载力强度降低很大，我们不加入木柱的计算中，后续应该做一些针对木结加固的实验。本文对加固木柱极限承载力进行理论分析，与已有的理论公式比较，建立木柱承载力的公式，并回归系数，与实验结果符合良好，为以后的工程实践提供参考。

[关键词] 横向应变;复合材料;加固;承载力;木柱

中图分类号：TU366.2 文献标识码：A 文章编号：1002-848X(2013)S1-0806-05

An analytical approach on the load carrying capacities of FRP-strengthened timber columns using the lateral strains

Yuan Shucheng, Liang Wei, Wang Qingyuan, Zhu Yanmei

(Energy safety engineering and Disasters mechanics key Laboratory of Education of Ministy., Chengdu 610065, China)

Abstract：With a large number of antique building appearing, more application of wood in structure building, and slight damage appeared in wooden of Sichuan earthquake on 12 May 2008, all these need strengthening. Seven short square timber columns reinforced with AFRP were fabricated to investigate the destruction form. The change factor is reinforce pattern and reinforcement layer. The results showed that the bearing capacity, stiffness and ductility of reinforced timber columns were all improved, the maximum improvement of bearing capacity and deformation ability of all is the specimen whole wrapped in 2 layers AFRP. The results also showed that the more of AFRP reinforcing layers, the higher of ultimate load bearing capacity, but the enhancement is not in proportion to the AFRP reinforcing layers. The improvement of bearing capacity began to decrease when the layers were three. Although the timber columns were reinforced with AFRP, all specimens were brittle broke. We also draw a conclusion that the knot would reduce great strength of bearing capacity. This would be a very interesting research direction. In this experiment we established the theoretical formula of ultimate bearing capacity of wooden, it could provide a reference for engineering practice.

Keywords: AFRP: lateral strain; composite material; reinforcement; bearing capacity; timber column

*国家杰出青年基金资助项目(10925211); 教育部创新团队计划资助项目(IRT1027)。

作者简介: 袁书成,硕士生， Email:yuansc2012@163.com。

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