长期荷载作用下钢-竹组合柱的力学性能  

Mechanical Properties of Steel-Bamboo Composite Columns under Long-Term Loading

作　　者：张家亮[1] 童科挺 陈伟[2] 王建民[2] 李玉顺 ZHANG Jialiang;TONG Keting;CHEN Wei;WANG Jianmin;LI Yushun(College of Science and Technology,Ningbo University,Ningbo 315300,China;School of Civil and Environmental Engineering,Ningbo University,Ningbo 315211,China;College of Civil Engineering and Architecture,Qingdao Agricultural University,Qingdao 266109,China)

机构地区：[1]宁波大学科学技术学院,浙江宁波315300 [2]宁波大学土木与环境工程学院,浙江宁波315211 [3]青岛农业大学建筑工程学院,山东青岛266109

出　　处：《建筑材料学报》2021年第4期800-810,共11页Journal of Building Materials

基　　金：国家自然科学基金资助项目(51978345,51678310);浙江省自然科学基金资助项目(LQ19E080007);宁波市科技计划项目(202002N3090)。

摘　　要：为研究钢-竹组合工字形柱(以下简称组合柱)在长期荷载作用下的力学性能,设计制作了18个组合柱试件,依次对其实施一次加载试验、长期加载试验与二次加载试验,观测并分析试件的蠕变过程,研究组合柱承载力与形变的影响因素及其变化规律.结果表明:组合柱有良好的整体性与承载能力,加载至60 d时蠕变变形已达蠕变总量的90%,Burger模型可以准确地描述组合柱的蠕变过程;长期荷载作用后,组合柱的延性与极限应变明显提高,极限承载力受长期荷载作用影响较小,承载力与延性随着含钢率的增加显著提升.To investigate the mechanical properties of steel-bamboo Ⅰ-section composite column under long-term loading, 18 specimens were designed and manufactured. Static loading test, long-term loading test and secondary static loading test were carried out successively, in which the creep process were measured and analyzed, influencing factors of bearing capacity and deformation and their variation rule were studied. Results show that the steel-bamboo Ⅰ-section composite column has high integrity and bearing capacity, the creep deformation reached 90% of the total creep when loaded for 60 days, the Burger model can accurately describe the creep process of the composite column. The ductility and ultimate strain are significantly increased after long-term loading, while the ultimate bearing capacity is not greatly affected, the bearing capacity and ductility are improved with the increasement of steel ratio.

关 键 词：钢-竹组合结构 工字形柱 长期荷载 蠕变变形 承载力 

分 类 号：TU398[建筑科学—结构工程]