中文摘要：

为研究钢-竹组合构件长期荷载作用后的整体工作性能，针对纯胶结型界面与复合胶结型界面共27个钢．竹界面试件进行了长期荷载作用后的推出试验，以界面形式、长期持荷水平以及持荷时间为基本参数，对钢．竹界面的承载力、黏结应力及相对滑移进行了分析。研究表明：钢-竹界面构造形式合理，具有较高的承载能力，长期荷载作用后试件界面完整性良好，复合胶结型界面试件的破坏具有显著的延性特征；2组纯胶结型界面试件在长期荷载作用后承载力发生衰减，衰减系数分别为0．91与0．81；纯胶结型界面的剪应力与相对滑移分布具有“两端大、中间小”的特征，2组试件界面最大剪应力分别为1．41MPa和1．25MPa，与短期荷载作用后试件相比，约衰减10％和20％，界面的相对滑移则略有增长；长期荷载作用后复合胶结型界面的承载力、黏结应力及相对滑移与短期荷载作用后试件相比，未发生显著变化，自攻螺钉可有效提高界面抗剪能力，按间距80mm加设自攻螺钉后，界面最大剪应力可达到1．7MPa。提出了长期荷载作用后的钢-竹界面黏结承载力计算方法，其计算结果与试验结果吻合较好。

英文摘要：

In order to investigate the reliability of bamboo-steel interracial bonding effect after long-term loading, 27 specimens, which were divided into pure bonding interface specimens and composite bonding interface specimens, were designed to perform push-out tests after long-term loading. Interfacial forms, applied values of the long-term loads and durations of the long-term loads were set as the basic parameters; the interfacial load carrying capacity, shear stress and the bond slip were investigated. The research shows, structural form of bamboo-steel interface is reasonable which remains intact after long-term loading. Interfaces provide with high load carrying capacities and the composite bonding interface specimens possess significant ductility characteristics. After long-term loading, load carrying capacity attenuation occurs in two groups of pure bonding interface, where the attenuation coefficients are 0.91 and 0.81 respectively. Shear stresses and bond slips are greater at the two endpoints and smaller at middle of the pure bonding interfaces, and the corresponding maximum values of the shear stress are 1.41 MPa and 1.25 MPa, which are decreased by 10% and 20% respectively compared with the interfacial shear stress under static loads. Compared with static load experiments, pure bonding interracial bond slips are increased slightly, and the load carrying capacities, shear stress and bond slips of composite bonding interface remain stable under long-term loading. Self-tapping screws may effectively improve the interracial shear capacity. When screws are set at an equal spacing of 80 ram, the corresponding maximum value of the shear stress is 1.7 MPa. A bonding capacity calculation method of bamboo-steel interface after long-term loading has been proposed. Interfacial capacities can be calculated, and the calculated values match well with experimental values.