带拼接板螺栓连接耗能梁段的可恢复功能钢框筒结构抗震性能研究

EXPERIMENTAL AND PARAMETRIC INVESTIGATION OF SEISMIC BEHAVIORS OF SUB-STRUCTURE OF EARTHQUAKE-RESILIENT STEEL FRAMED-TUBE STRUCTURE WITH BOLTED SPLICE-PLATE SHEAR LINKS

  • 摘要: 为了提升传统钢框筒结构的延性和耗能能力,提出采用拼接板螺栓连接的可恢复功能剪切耗能型钢框筒结构(FTS-SRSL),该结构结合了可更换剪切型耗能梁段和钢框筒结构具有良好的抗震性能。该文对一个2/3缩尺的单层单跨FTS-SRSL子结构试件进行了往复加载试验,试验结果表明,FTS-SRSL子结构试件具有良好的抗震性能,结构损伤集中于耗能梁段,且耗能梁段可实现更换。在试验的基础上,以耗能梁段长度比、耗能梁段腹板加劲肋间距、螺栓直径、翼缘拼接板和腹板拼接板厚度为参数,利用ABAQUS建立了15个足尺的单层单跨FTS-SRSL有限元模型,探究各模型的抗震性能,包括承载力、刚度、耗能以及塑性变形能力。有限元分析结果表明:改变拼接板螺栓连接的剪切型耗能梁段长度比会显著影响结构的承载力、刚度及耗能,建议FTS-SRSL中的拼接板螺栓连接剪切型耗能梁段长度比取0.73~1.09;改变耗能梁段腹板加劲肋间距对结构的承载力、刚度和耗能影响较小,基于该文的分析结果,建议FTS-SRSL中的拼接板螺栓连接剪切型耗能梁段腹板加劲肋间距取e/4~e/3(e为耗能梁段长度),且间距应满足我国抗规的规定;改变翼缘拼接板和腹板拼接板厚度对结构的承载力、刚度及耗能基本无影响;改变螺栓直径对结构承载力、刚度及耗能影响较小。

     

    Abstract: In order to improve the ductility and energy dissipation capacity of traditional steel frame-tube structures, proposed is an earthquake-resilient steel frame-tube structure with bolted splice-plate shear links (FTS-SRSL). FTS-SRSL combines the advantages of replaceable shear links and steel frame tube structure, which has a good seismic performance. A cycle loading test was performed on a 2/3-scale single-storey single-span FTS-SRSL sub-structure. Test results demonstrated that the sub-structure of FTS-SRSL possesses a great seismic performance, and structural damage is concentrated in shear links which can be replaced. On the basic of the test, the length ratio of shear links, the spacing of web stiffeners of shear links, the diameter of bolt, the thickness of flange splice-plate and web splice-plate were concerned as parameters to investigate the hysteretic behaviors of FTS-SRSL. The finite element analysis software ABAQUS was used to establish finite element models (FEMs) of 15 full-scale FTS-SRSL sub-structure with single-storey and single-span. The global seismic response, bearing capacity, stiffness, energy dissipation, and plastic deformation ability of each FEM were evaluated. The finite analysis results demonstrated that changing the length ratio of the shear links can significantly affect the bearing capacity and, stiffness and energy consumption of the FEMs. Based on the analysis of this paper, it is suggested that the length ratio of the shear links should be ranged within 0.73 to 1.09. The bearing capacity and energy consumption of the structure could be reduced without stiffeners. The spacing of the link web stiffeners had little effect on the bearing capacity, on the stiffness, and on the energy consumption of the structure. And it is suggested that: the spacing of link web stiffeners of FTS-SRSL should be ranged within e/4 to e/3(e is the length of the shear links), and the spacing should follow the requirements in Code for Seismic Design of Buildings. The thickness of flange splice-plate and web splice-plate had no effect on the bearing capacity, on the stiffness and energy consumption of the structure. The diameter of bolt had little effect on the bearing capacity, on the stiffness and, on the energy consumption of the structure.

     

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