不同加载模式下钢管约束重组竹轴压力学行为  

Mechanical behavior of bamboo scrimber filled steel tube under different loading modes

作　　者：吴凤贻 魏洋[1] 王高飞 林煜 丁明珉 WU Fengyi;WEI Yang;WANG Gaofei;LIN Yu;DING Mingmin(College of Civil Engineering,Nanjing Forestry University,Nanjing 210037,China)

机构地区：[1]南京林业大学土木工程学院,南京210037

出　　处：《复合材料学报》2024年第2期978-989,共12页Acta Materiae Compositae Sinica

基　　金：国家自然科学基金(51778300);江苏省研究生科研与实践创新计划(KYCX22_1061);江苏省重点研发计划项目(BE2020703)。

摘　　要：本文将重组竹与钢管复合形成新型钢管约束重组竹。对24个新型钢管约束重组竹圆柱试件进行了轴压试验,研究了钢管厚度和加载方式(全截面与核心加载)对其轴压性能的影响。试验结果表明:外加钢管能够有效地提高结构承载力和变形能力;钢管约束重组竹圆柱主要破坏形态为剪切破坏;结构的峰值应力、峰值应变均与钢管厚度呈正相关,随着钢管厚度增加,试件的峰值应力最大增长22.4%,峰值应变最大增长6.1%;核心受压钢管重组竹较全截面受压试件展现了更好的承载潜力和变形能力。根据全截面受压和核心受压的曲线不同,考虑了钢管套箍系数,分别提出了两种加载方式下新型钢管约束重组竹的极限应力、极限应变和峰值应力、峰值应变的预测模型,应力计算模型误差均在10%以内。最后建议了应力-应变全曲线模型,预测了不同加载方式下新型钢管约束重组竹的应力-应变变化规律。By means of structural innovation,a new type of bamboo scrimber filled steel tube was formed by composite materials of bamboo scrimber and steel tube.Axial compression tests were carried out on 24 cylindrical specimens of the new type of bamboo scrimber filled steel tube to study the effect of steel tube thickness and loading mode(full section and core loading)on its axial compression performance.The test results show that the external steel tube can effectively improve the structural bearing capacity and deformation capacity,and the main failure mode of the bamboo scrimber filled steel tube is shear failure.The peak stress and peak strain of the structure are positively correlated with the steel tube thickness.As the steel tube thickness increases,the maximum increase in peak stress of the specimens reaches 22.4%,while the maximum increase in peak strain is 6.1%.The core loading specimens exhibit better load bearing potential and deformation capacity than the full section loading specimens.Based on the different curves of full section loading and core loading,and considering the steel tube confinement factor,the prediction models of ultimate stress,ultimate strain,peak stress and peak strain of the new type of bamboo scrimber filled steel tube under different loading modes are proposed,and the error of the stress calculation model is less than 10%.Finally,the stress-strain full curve model is proposed,and the stress-strain variation of the new bamboo scrimber filled steel tube under different loading modes is predicted.

关 键 词：重组竹 钢管约束重组竹 加载方式 轴压性能 计算模型 

分 类 号：TU398.6[建筑科学—结构工程] TB332[一般工业技术—材料科学与工程]