长期荷载作用对钢-竹组合箱形柱力学性能的影响  

Study on Effect of Long Term Load on Mechanical Properties of Steel-Bamboo Composite Box Columns

作　　者：卞西波 李玉顺[1] 许科科 张家亮[1] Bian Xibo;Li Yushun;Xu Keke;Zhang Jialiang(College of Architectural,Civil Engineering and Environment,Ningbo University,Ningbo 315211)

机构地区：[1]宁波大学建筑工程与环境学院,浙江宁波315211

出　　处：《森林工程》2018年第3期107-112,共6页Forest Engineering

基　　金：国家自然科学基金项目(51378265;51678310);宁波市自然科学基金项目(2017A610305)

摘　　要：为研究长期荷载作用对钢-竹组合箱形柱力学性能的影响规律,以长期荷载水平、截面尺寸、有无螺钉为参数设计制作了9根钢-竹组合箱形短柱试件,其中6根为长期试件,施加长期荷载后实施二次轴心受压破坏试验,其余3根作为对比用的短期试件,直接进行一次轴心受压破坏试验。对比分析长期试件和短期试件的破坏过程、破坏形态、破坏特征,探讨长期荷载作用后的钢-竹组合箱形短柱的荷载-应变关系、极限承载力、构件延性等力学性能的变化规律。结果表明:长期荷载水平对试件极限承载力和延性系数有一定的影响,但对屈服承载力的影响不明显;增大截面尺寸,试件屈服荷载提高,极限承载力和延性系数降低;螺钉可以提高试件延性系数而对承载力影响不明显;长期荷载作用后试件极限承载力和延性均有一定的衰减,但极限承载力仍高于1.5倍的屈服承载力、延性系数大于2.0,说明长期荷载作用后,钢-竹组合箱形柱仍具有良好的强度贮备和延性性能,能够作为长期受力构件用于实际工程结构。In order to study the effect of long-term load on mechanical properties of steel-bamboo composite box columns, nine steel-bamboo composite box-shaped short columns were designed and manufactured based on the parameters including long-term load level, cross-sectional dimensions with or without screws. Six of them were tested secondly under axial compression after long-term load, the other three directly conducted a test of axial compression failure as contrast. The failure process, modes and characteristics of specimens were comparatively analyzed. The relationship between load and strain, ultimate bearing capacity and ductility of steel-bamboo composite box-shaped short column after long-term loading were investigated. The results showed that the long-term load level had some influence on the ultimate bearing capacity and ductility coefficient of the specimen, but had no obvious effect on the yield capacity. With the enlarge of cross-sectional dimension, the yield load of specimen increased, the ultimate bearing capacity and ductility coefficient decreased instead. The screw could improve the ductility coefficient of the specimen but had no significant influence on the bearing capacity. After the long term loading, the ultimate bearing capacity and ductility of the specimen all had a certain attenuation, but the ultimate bearing capacity was still higher than 1.5 times the yield bearing capacity and ductility coefficient was greater than 2.0, which indicated that steel-bamboo composite box column had good strength reserve and ductility after long-term loading and could be used in actual projects.

关 键 词：钢-竹组合箱形柱 长期荷载 承载力衰减值 延性系数 

分 类 号：TU366.1[建筑科学—结构工程] TU398