李玉顺, 张家亮, 童科挺, 郭军, 邬沛. 钢-竹组合工字形梁界面滑移及变形分析[J]. 工程力学, 2018, 35(7): 150-158,166. DOI: 10.6052/j.issn.1000-4750.2017.03.0215
引用本文: 李玉顺, 张家亮, 童科挺, 郭军, 邬沛. 钢-竹组合工字形梁界面滑移及变形分析[J]. 工程力学, 2018, 35(7): 150-158,166. DOI: 10.6052/j.issn.1000-4750.2017.03.0215
LI Yu-shun, ZHANG Jia-liang, TONG Ke-ting, GUO Jun, WU Pei. STUDY ON INTERFACE SLIP AND DEFORMATION OF BAMBOO-STEEL COMPOSITE I-BEAMS[J]. Engineering Mechanics, 2018, 35(7): 150-158,166. DOI: 10.6052/j.issn.1000-4750.2017.03.0215
Citation: LI Yu-shun, ZHANG Jia-liang, TONG Ke-ting, GUO Jun, WU Pei. STUDY ON INTERFACE SLIP AND DEFORMATION OF BAMBOO-STEEL COMPOSITE I-BEAMS[J]. Engineering Mechanics, 2018, 35(7): 150-158,166. DOI: 10.6052/j.issn.1000-4750.2017.03.0215

钢-竹组合工字形梁界面滑移及变形分析

STUDY ON INTERFACE SLIP AND DEFORMATION OF BAMBOO-STEEL COMPOSITE I-BEAMS

  • 摘要: 基于初等梁变形理论和界面滑移与应变差关系,建立了钢-竹组合工字形梁界面相对滑移微分方程,推导出3种常见荷载作用下的组合梁钢-竹界面滑移和应变差解析解,在此基础上依据虚功原理提出了界面滑移引起的跨中附加挠度理论计算公式,从而形成了钢-竹组合工字形梁考虑滑移效应的跨中挠度计算方法,进一步通过6根梁的模型试验,探讨了界面应变差、界面滑移分布以及组合梁变形,并与试验结果进行了比较。理论分析和试验研究结果表明:钢-竹界面应变差的理论计算值与试验结果吻合较好,受压区和受拉区应变差分布基本相同;组合梁的纯弯区段,界面滑移曲线斜率增大,而弯剪区段则逐渐减小,界面滑移在梁端达到最大值,且在整个弯剪区段保持较大水平,因此在该区域布置连接件,可有效提高组合梁的整体工作性能;考虑界面滑移效应后的理论分析结果与未考虑滑移效应的换算截面法相比,更接近组合梁真实的变形,平均误差由11.5%减小为1.64%,随着变形的增大,基于界面滑移效应的钢-竹组合梁变形分析方法的优越性将更为突出。

     

    Abstract: On the basis of elementary beam deformation theory as well as the relationship between interface slip and strain difference, differential equations of interface slip in I-section bamboo-steel composite beams are established. Analytic expressions of bamboo-steel interface slip and strain difference which corresponds to three classical loads are derived, based on which the formula of additional mid-span deflection caused by interface slip is put forward according to the principle of virtual work, so as to deduce a calculation method of additional mid-span deflection considering slip effect. 6 specimens were prepared in the experiment, the strain difference, distribution of the interface slip and deformation of the composite beam were investigated, and the theoretical method was compared with the experimental results. Results show that theoretical calculations of bamboo-steel interface strain difference coincide with experimental results well, and distributions of strain differences in compression area and tensile area are basically the same; slop of interface slip curve increases in the pure bending area and decreases in the bending-shear area; maximum values of the slip are found on the beam ends, and the slip is larger in the whole bending-shear area, thus the arrangement of a number of connectors in the bending-shear area may effectively improve the working performance of the composite beams. Considering the slip effect or not, a comparison between the new method and the transformation-section method show that the new method is more closer to the experimental results, as the average error decreases from 11.5% to 1.64%, and advantages of the new method become more obvious when deformation increases.

     

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