长期荷载作用后钢-竹界面黏结性能分析

发布时间：2018-01-28 19:16

本文关键词： 钢-竹组合构件钢-竹界面长期荷载推出试验黏结性能　出处：《建筑结构学报》2017年09期 　论文类型：期刊论文

【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1.41 MPa和1.25 MPa,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80 mm加设自攻螺钉后,界面最大剪应力可达到1.7 MPa。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。
[Abstract]:In order to study the overall performance of steel-bamboo composite members after long term load, 27 specimens with pure cemented interface and composite cemented interface were tested after long term load. The bearing capacity, bond stress and relative slip of the steel-bamboo interface are analyzed with the interface form, long-term load holding level and holding time as the basic parameters. The results show that the structural form of the steel-bamboo interface is reasonable. It has high bearing capacity, good interfacial integrity after long-term loading, and the failure of composite cemented interface specimens has obvious ductility characteristics. The bearing capacity of two groups of pure cemented interface specimens attenuates after long term load with attenuation coefficients of 0.91 and 0.81respectively. The shear stress and relative slip distribution of pure cemented interface are 1. 41 MPa and 1. 25 MPa, respectively. Compared with the specimen subjected to short term load, the attenuation is about 10% and 20, and the relative slip of the interface increases slightly. The bearing capacity, bond stress and relative slip of the composite cemented interface after long term load have not changed significantly compared with those of the specimen after short term load. The self-tapping screw can effectively improve the shear resistance of the interface. The maximum shear stress of the interface can reach 1.7 MPA after the self-tapping screw is added at the distance of 80mm. A method for calculating the adhesion capacity of the steel-bamboo interface under long-term loading is proposed. The calculated results are in good agreement with the experimental results.
【作者单位】：宁波大学建筑工程与环境学院;肯特州立大学建筑与环境设计学院;
【基金】：国家自然科学基金项目(51378265,51678310) 宁波市自然科学基金项目(2017A610305)
【分类号】：TU398.9
【正文快照】： 2.肯特州立大学建筑与环境设计学院,俄亥俄肯特44242)0引言钢-竹组合构件是以改性竹材与薄壁型钢为主要材料,通过结构胶与自攻螺钉将两者复合而成,可充分发挥两种材料的优势,有利于生态平衡及能源节约。近年来,随着环境问题的日益突出,竹材、木材等环境友好型建筑材料的应用受

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