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多重组合式十字形钢管混凝土柱轴压试验研究及有限元分析
Axial compression test and finite element analysis of multiple composite concrete filled steel tubular columns
投稿时间:2019-12-02  修订日期:2020-03-03
DOI:
中文关键词:  多重组合式  轴压承载力  有限元分析  工作机理研究
英文关键词:Multiple combination  Axial bearing capacity  Finite element analysis  Working mechanism study
基金项目:国家自然科学基金(51868020)、江西省自然科学基金重点项目(20192ACBL21002)、江西省青年科学基金项目(20171BAB216044)、江西省教育厅科学技术研究项目(GJJ170397)资助
作者单位E-mail
黄宏 华东交通大学 huanghong1977@foxmail.com 
王文鹏 华东交通大学 2439819340@qq.com 
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中文摘要:
      摘要:在组合十字形钢管混凝土柱的基础上,提出了一种在其横向和纵向增加槽钢数量以改变柱肢长度的多重组合式十字形钢管混凝土柱。进行了4根多重组合式十字形钢管混凝土柱轴压试验,试件设计的变化参数为构件长度和截面形式。试验结果表明:试件B-500和试件C-500的破坏形态属于轴压破坏,试件C-700和试件C-900的破坏形态类似于偏压破坏;增加柱肢长度有效地提高了试件的极限承载力并改善了其延性。在此基础上,采用有限元软件ABAQUS对4根多重组合式十字形钢管混凝土异形柱轴压的荷载-变形受力全过程进行模拟分析,模拟的荷载-位移曲线结果表明:试件的初始刚度及其极限承载力与试验结果吻合较好,但在弹塑性阶段,两者相差较大,这是由于有限元模拟中所采用的混凝土的本构关系中没有很好地能反映这种结构形式中钢管对混凝土的多重约束作用。研究分析了构件在受力过程中各组成部分荷载分配的工作机理,分析结果表明:多重组合式十字形柱中钢管承担了接近70%的荷载;对比截面形式相同的空钢管,多重组合式十字形柱中混凝土的存在提高了钢材的延性;由于钢材对芯柱内填混凝土的多重约束,混凝土达到峰值荷载后承担的荷载在短暂下降后会继续提高。
英文摘要:
      Abstract: On the basis of composite concrete-filled steel tube column, a new type of composite concrete-filled steel tube column with multiple sections is proposed.The axial compression tests of four multi-composite concrete filled steel tube columns were carried out.The test results show that the failure modes of specimens B-500 and C-500 belong to axial compression failure, and the failure modes of specimens C-700 and C-900 are similar to that of biaxial failure.The ultimate bearing capacity and ductility of the specimens were improved by increasing the length of the column legs.On this basis, the finite element software ABAQUS was used to simulate the whole load-deformation process of four multi-composite cross-shaped concrete-filled steel tubular columns under axial compression, the initial stiffness and ultimate bearing capacity with the test results are in good agreement, but in the elastic-plastic stage, the two large difference, this is due to the finite element simulations of the constitutive relationship of concrete can not properly reflect the multiple constraints of structural forms in the steel tube of concrete.The working mechanism of load distribution of components in the process of stress is studied and analyzed.Compared with the hollow steel tube with the same cross section, the existence of concrete in the multi-composite cross column improves the ductility of the steel.Due to the multiple constraints of steel on the concrete filled in the core column, the load borne by the concrete after reaching the peak load will continue to rise after a short drop.
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