全螺栓装配式钢框架外挂轻质墙板有限元分析

基于一体化轻质保温装饰墙板全螺栓装配式钢框架的抗震性能试验研究,本文采用商业有限元软件ABAQUS对结构进行了精细化非线性有限元分析。研究了结构的滞回性能、结构能力、应力分布以及失效模式等,提出了在柱脚和龙骨间设置加劲肋的改进设计方案,并对诸如顶底L型件水平板和竖向板螺栓数量、加劲肋形式、结构高跨比以及轴压比等关键设计参数进行了拓展分析。结果表明,采用本文有限元建模方法能够精准地模拟试验的滞回性能,极限承载力与试验最大差值为8.86%,模型失效模式及应力分布与试验现象高度吻合;柱脚和龙骨间加劲肋使柱脚内外翼缘协同变形,减小翼缘局部屈曲,避免龙骨连接处焊缝的应力集中,显著提升了结构承载力;通过优化顶底L型件的螺栓数量和加劲肋形式等设计参数,可进一步提升结构能力;实际工程中应合理控制结构高跨比和轴压比,以满足抗震设防要求。

Finite element analysis on seismic performance of fully bolted prefabricated steel frame with external light wall panel

Based on the experimental research on the seismic performance of a fully bolted prefabricated steel frame with an external integrated lightweight thermal insulation decorative wall panel,the commercial finite element software ABAQUS was used to carry out a refined nonlinear finite element analysis of the structure in this paper.The hysteresis performance,structural capacity,stress distribution and failure mode of the structure were investigated,and an improved design scheme for setting the column base and keel stiffeners was proposed.Besides,the key design parameters such as the number of bolts of the horizontal and vertical plates of the top and seat L-shaped angles,the types of stiffeners,the structural height-span ratio and the axial compression ratio are also analyzed.The results show that the hysteresis performance of the test can be accurately simulated by the finite element modeling method in this paper,the maximum difference between the predicted ultimate bearing capacity and the experimental one is 8.86%,and the failure mode and stress distribution are highly consistent with the test.The column base and keel stiffeners make the column base flanges deform together,reduce the local buckling of the flanges,avoid the stress concentration of the keel connection welds,and significantly improve the structural bearing capacity.By optimizing the design parameters such as the number of bolts and the types of stiffeners of the top and seat L-shaped angles,the structural capacity can be further improved.In the actual project,the structural height-span ratio and the axial compression ratio should be reasonably controlled to meet the seismic fortification requirements.