摘要
为研究钢-竹组合构件偏心受压时的受力性能,设计制作了36根钢-竹组合工字形柱并进行偏心受压试验。以偏心距、长细比、有无螺钉连接为主要参数,分析不同参数对组合柱破坏形态、承载能力、侧向挠度等的影响。依据采用偏心距增大系数的极限平衡法和引入参数影响系数的统一理论法推导了两种偏压承载力理论计算式。结果表明:钢-竹组合柱受力性能优良,组合效应突出,破坏形态具有一定规律性;偏心距较小时由底部牛腿区域出现竹材劈裂后向中部扩展而破坏;偏心距及长细比较大时由受压侧中部竹板劈裂鼓起后向两端延伸而破坏;偏心距对试件承载力和侧向挠度均有较大影响;有无螺钉对试件承载力无明显影响,布置螺钉减小了侧向挠度;在设计参数范围内,承载力受长细比影响不显著,随长细比增加呈缓慢降低趋势;承载力计算值与试验值吻合良好,误差均在10%以内。
In order to investigate the mechanical performance of steel-bamboo hybrid members under eccentric compression, a total of 36 steel-bamboo composite I-section columns were designed and tested under eccentric loading. The eccentricity, slenderness ratio and the presence of screw connections were considered as the main parameters, and the influence of different parameters on the failure modes, bearing capacity and lateral deflection of the composite column was analyzed. According to the limit equilibrium method with introduction of eccentricity coefficient, and the unified theory method by introducing the influence coefficient of parameters, two theoretical calculation formulas for eccentric compression bearing capacity were derived. The results show that steel-bamboo composite columns have excellent performance and reliable composite effect, and following a certain failure modes.When the eccentricity is small, the bamboo cleavage firstly occurrs in the end of the ox leg area and then expands to the middle to be destroyed.While with large eccentricity and slenderness ratio, the bamboo cleavage firstly occurrs in the middle height of the compressive side and then extended to both ends to be destroyed. The eccentricity has a great influence on the bearing capacity and lateral deflection of specimens. The screw connections have no significant effect on the bearing capacity of specimens, but the arrangement of the screws reduces the lateral deflection. The bearing capacity is not significantly affected by the slenderness ratio within the range of design parameters, and decreases slowly as the slenderness ratio increases. The calculated values of the bearing capacity formula agree well with the experimental values, where the errors are within 10%.
作者
茅鸣
童科挺
张家亮
刘涛
李玉顺
MAO Ming;TONG Keting;ZHANG Jialiang;LIU Tao;LI Yushun(School of Civil and Environmental Engineering,Ningbo University,Ningbo 315211,China)
出处
《建筑结构学报》
EI
CAS
CSCD
北大核心
2021年第8期126-135,共10页
Journal of Building Structures
基金
国家自然科学基金项目(51978345,51678310)
宁波市科技计划项目(202002N3090)。
关键词
钢-竹组合结构
工字形柱
偏心受压试验
受力性能
承载力计算
steel-bamboo composite structure
I-section column
eccentric loading test
mechanical performance
bearing capacity calculation
