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A Novel Nonlinear Link Element for Direct Second-Order Analysis of Trusses Assembled by Weak Shear
KSCE Journal of Civil Engineering ( IF 2.2 ) Pub Date : 2020-09-17 , DOI: 10.1007/s12205-020-1688-4
Ruijie Zhu , Feng Li , Zhiqin Zhao , Xingzhong Wang

The transverse shear effect and initial imperfection have significant influence on the post-buckling performance of weak shear stiffness struts such as pultruded fiber reinforced polyester (FRP) members and lattice column. A novel nonlinear link (NNL) element was proposed to perform direct second-order analysis of trusses assembled by such members. Adopting the Engesser approach to account for shear deformability, the expressions of transverse deflection under tensile and compressive load were obtained respectively. Taking the linear tension-compression deformation and bowing effect into account, the correction coefficients of axial stiffness for FRP truss member under tension and compression were obtained. Combined with ANSYS UPFs -user programmable features, the user-defined NNL element was established. Both pultruded FRP profiles and lattice column were modeled separately by standard commercial elements and the proposed NNL element. The comparison of the obtained results verified the convenience of the NNL element in modeling and computing. Moreover, the NNL element was adopted to model and calculate two FRP plane truss structures, and the calculation result was compared with test result. It demonstrated that the NNL element can accurately predict structural stiffness change and change points during successive buckling of certain truss members, showing the promising usage of NNL element in structural design of other FRP truss structures.



中文翻译:

弱剪力组装桁架直接二阶分析的新型非线性连杆单元

横向剪切效应和初始缺陷对拉挤纤维增强聚酯(FRP)构件和晶格柱等弱剪切刚度支撑杆的后屈曲性能具有重大影响。提出了一种新颖的非线性连接(NNL)单元,以对由此类构件组装的桁架进行直接的二阶分析。采用Engesser方法解决了剪切变形问题,分别得到了在拉伸和压缩载荷作用下的横向挠度表达式。考虑到线性拉压变形和弯曲效果,得出了FRP桁架构件在拉压状态下的轴向刚度校正系数。结合ANSYS UPF-用户可编程功能,建立了用户定义的NNL元素。拉挤的FRP型材和晶格柱分别由标准的商业元素和建议的NNL元素建模。所得结果的比较证明了NNL元素在建模和计算中的便利性。另外,采用NNL单元对两个FRP平面桁架结构进行建模和计算,并将计算结果与试验结果进行比较。结果表明,NNL单元可以准确地预测某些桁架构件连续屈曲过程中的结构刚度变化和变化点,这表明NNL单元在其他FRP桁架结构的结构设计中具有广阔的应用前景。采用NNL单元对两个FRP平面桁架结构进行建模和计算,并将计算结果与试验结果进行比较。结果表明,NNL单元可以准确地预测某些桁架构件连续屈曲过程中的结构刚度变化和变化点,这表明NNL单元在其他FRP桁架结构的结构设计中具有广阔的应用前景。采用NNL单元对两个FRP平面桁架结构进行建模和计算,并将计算结果与试验结果进行比较。结果表明,NNL单元可以准确地预测某些桁架构件连续屈曲过程中的结构刚度变化和变化点,这表明NNL单元在其他FRP桁架结构的结构设计中具有广阔的应用前景。

更新日期:2020-09-12
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