薄壁方形钢管/竹胶板组合空芯短柱抗压测试

Compressive Performance of Square Thin-Walled Steel Tube/Bamboo Plywood Composite Hollow Short Column

对带约束拉杆和不带约束拉杆2组各5个薄壁方形钢/竹胶板组合空芯短柱(SBCC)进行轴心抗压试验,考察SBCC受压破坏形态,重点分析横向约束拉杆对试件破坏特征荷载的影响.结果表明:不带约束拉杆试件以竹胶合板基体之间的开胶破坏为主,而带约束拉杆试件主要为柱端材料压折破坏.相对于不带约束拉杆试件,带约束拉杆试件的开裂破坏荷载提高约19.4%,平均极限承载荷载(平均极限压应力)提高约17.2%,轴向压缩变形和压应变均有提高.拉杆约束可抑制SBCC短柱的开胶失效,改变其极限破坏形式而提高其抗压能力.

Ten square thin walled steel tube/bamboo plywood composite hollow short columns(SBCCs)were divided into two groups,one group with binding bars and the other group without binding bars.The two group SBCCs were used to perform the axial compression tests.The failure modes of SBCCs loaded were investigated and the influences of the binding bars on the characteristic load of SBCC were mainly analyzed.The results indicate that the compressive damage of SBCCs without binding bars are primarily the glue failure between the matrix interfaces,and the compressive damage of SBCCs with binding bars are primarily the broken damage of plywood material at the end of the column.Compared with the specimens without binding bars,the crack load of the specimens with binding bars was averagely increased by19.4%,and the ultimate bearing capacity(ultimate compressive stress)was averagely increased by17.2%.Moreover,axial compression deformation and compressive strain were definitely increased.The binding bars can effectively suppress the glue failure,change the ultimate failure mode and significantly improve the ultimate carrying capacity of SBCC.