薄壁方钢管/竹胶合板组合空芯柱偏心抗压试验研究

Eccentric Compression Experimental Study on Square Thin-Walled Steel Tube/Bamboo-Plywood Composite Hollow Column

对9根薄壁方钢管/竹胶合板组合空芯柱(SBCC)进行了偏心抗压试验,考察了SBCC受压破坏形态,分析了SBCC长细比、偏心距、空心率和净横截面面积对其极限承载力的影响,建立了SBCC极限承载力计算模型.结果表明:SBCC受压破坏形态主要包括柱端部不同基体胶合面开胶和竹胶合板材料开裂破坏、柱身中部受拉侧不同基体胶合面开胶和抗压侧竹胶合板材料压屈破坏、柱整体开胶破坏.SBCC极限承载力随其净横截面面积增大而提高,随其长细比、偏心距和空心率的增大而降低.所建立的SBCC极限承载力计算模型可为其工程应用提供参考.

9 square thin-walled steel tube/bamboo-plywood composite hollow columns（SBCCs） were used to perform the eccentric compression tests. The failure modes of SBCC loaded were investigated, the influ- ences of slenderness ratio, eccentric distance, hollow ratio and net cross section size of SBCC on the ulti- mate bearing capacity of SBCC were analyzed, and the calculation model of the ultimate bearing capacity of SBCC was formulated. The results indicate that the compressive failure modes of SBCCs are primarily the glue failure between the matrix interfaces and the cracking damage of bamboo plywood material at the end of the column, the glue failure between the matrix interfaces at the tension side and the buckling damage of plywood material at the compressive side of the middle of the column, and the glue failure of the global col- umn. The ultimate bearing capacity of SBCC generally increases as the net cross section size increases, and decreases as the slenderness ratio, eccentric distance and hollow ratio increase. The calculation model of the ultimate bearing capacity can provide guidance for engineering applications.