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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。
Taking the actual project under construction as the research background and referring to the GB 50329-2012 Standard for Testing Wood Structure, the test results of the long-span all-bamboo roof truss and the bamboo-shaped Static load test was carried out, the load-deformation relationship and failure mode of the two kinds of roof truss structures were analyzed, and the mechanical performance of the 2 榀 roof truss was studied. The results show that the failure of the plastic roofing frame is brittle failure. The failure pattern of the roof frame is mainly manifested in the instability and bending failure of the winding rod. The performance of the steel-bamboo roof frame system with the high strength steel rod as the lower pulling rod is better than the traditional Trusses in the form of bamboo roof truss system, in practical engineering applications can give priority to using the lower steel rod steel - bamboo roof truss. The finite element analysis of the truss structure mechanical performance is carried out. The analysis results are in good agreement with the test results. The bearing capacity of roof truss was calculated by GB 50005-2003 “Code for Design of Timber Structure”. The calculated results are in good agreement with the test results, which can better evaluate the bearing capacity of the composite bamboo truss.