摘要
以某在建的实际工程为研究背景,参照GB 50329—2012《木结构试验方法标准》对2榀跨度均为20 m的胶合竹结构大跨度全竹屋架和"人"字形钢-竹屋架进行静力加载试验,分析两种屋架结构的荷载-变形关系以及破坏形态,研究2榀屋架的受力性能。试验结果表明:胶合竹屋架的破坏属于脆性破坏,2榀屋架的破坏形式主要表现在上弦杆的失稳和弯曲破坏,采用高强钢棒作为下弦拉杆的钢-竹屋架体系各项性能优于传统桁架形式的竹屋架体系,在实际工程应用中可优先考虑采用下弦钢拉杆的钢-竹屋架。对屋架结构受力性能进行有限元分析,分析结果与试验结果总体吻合较好。采用GB 50005—2003《木结构设计规范》计算屋架的承载力,计算结果与试验结果比较接近,该规范能较好评估胶合竹屋架的承载力。
Based on an actual project,this paper studies two full-scale 20 m long glued bamboo（ glubam） truss models with two types of configurations. The glubam trusses were tested to failure under gradually increased load.Through the tests,the load-deflection curves and failure modes were obtained. The mechanical behaviors were evaluated and compared. Experimental results show that the failure mode of the two glubam trusses is brittle failure caused by the destruction of upper compression chord. The performance of the truss system with glubam elements as upper compression chords and the high-strength steel bars as tension chords is superior to the glubam truss with conventional configuration and thus is considered more suitable for actual construction. The finite element analysis（ FEA） results show good agreement with test results. The experimental and analytical load capacities based on current Chinese code for timber structures are reasonably close.
出处
《建筑结构学报》
EI
CAS
CSCD
北大核心
2016年第4期47-53,共7页
Journal of Building Structures
基金
教育部博士点基金重大项目(20130161130003)
科技部国际科技合作与交流专项(2014DFE70230)
