薄壁型钢管/胶合竹板复合柱抗震性能试验

Experiments on the Seismic Behavior of Thin-Walled Steel Tube/Bamboo Plywood Composite Columns

对9根带约束拉杆的方形薄壁型钢管/胶合竹板复合空芯柱(SBCCB)试件进行低周反复拟静力测试,考察SBCCB的破坏过程和形态,分析试件的长细比、胶合竹净横截面面积、截面组合方式对其受力和抗震性能影响。结果表明:SBCCB破坏形态主要为柱脚胶合面的开裂破坏和胶合竹板断裂破坏,截面组合方式对其破坏模式有显著影响。SBCCB试件有较好的弹性变形能力和抗震耗能性能,增大复合柱截面尺寸和长细比能改善抗震性能;约束拉杆有效保证了试件的整体性,抑制基体开胶破坏,间接提高了抗震性能。

The development of laminated-bamboo has broadened the applications of bamboo material in structural engineering.An assembling composite hollow column parallel to the fiber texture is composed of square thin-walled cold-formed steel tube/bamboo plywood reinforced by transverse binding bars and structural adhesive.The thin-walled steel-tube/bamboo plywood assembling composite hollow columns with binding bars（SBCCBs）are a new type of steel/bamboo composite with excellent physical and mechanical properties.Multi-layered high-strength bamboo plywood forms the primary body in an SBCCB that is subjected to forces,while the square thinwalled steel tube serves as a liner.Large numbers of bamboo are used,which reduces the manufacturing cost of the composite columns and results in a relatively high load-bearing capacity.Nine thin-walled SBCCBs were used to perform low-cyclic reversed quasi-static loading tests,and their damage process and failure modes were investigated.The influence of the shear-span ratio,net cross-sectional area,sectional combination mode of SBCCBs on the bearing capacity,and seismic behavior were analyzed.The results indicate that the failures of SBCCBs are primarily the cracking damage between the gluing interfaces and the fracture damage of plywood material at the foot of column.The sectional combination mode had a significant influence on the failure mode,and the seismic behavior of SBCCB can be improved by increasing the net cross-sectional area and slenderness ratio of the composite hollow columns.SBCCBs have good elastic deformation and seismic energy dissipation capacities,and the binding bars can effectively guarantee the integrity of SBCCB and suppress the gluing failure between the matrix interfaces.SBCCB specimens showed an excellent seismic performance and can be used as the vertical bearing element of a multi-story,pre-fabricated,column-supported,and bamboo-framed wood building.