钢管腹杆-混凝土K形组合节点试验及仿真分析

发布时间：2019-01-23 21:07

【摘要】：为研究钢桁腹-混凝土组合梁中钢管腹杆与混凝土弦杆K形组合节点的传剪机理,开展K形节点区抗剪试验及节点区键销钢筋、连接螺栓的直剪试验,得到K形节点区的破坏形态,并通过试验提出的钢筋及螺栓直剪的多折线荷载~位移本构模型,进行K形节点区的精细化三维非线性仿真分析。研究结果表明,K形节点区的竖向剪力来自于相邻节间弦杆的轴力差,键销钢筋及连接螺栓的直剪破坏是节点区受剪失效的主要原因,其抗剪承载力主要由键销钢筋及连接螺栓提供;所建立的K形节点区非线性仿真模型能够较好地反映节点区的破坏形态,极限承载力及荷载~位移曲线与试验结果吻合良好。
[Abstract]:In order to study the shear transmission mechanism of steel truss web bar and concrete chord K-shaped joint in steel truss web concrete composite beam, the shear test of K-shaped joint zone and the direct shear test of key pin reinforcing bar and connecting bolt in the joint area were carried out. The failure mode of K shape joint region is obtained, and the fine three dimensional nonlinear simulation analysis of K shape joint area is carried out by means of the constitutive model of multi fold line load and displacement of steel bar and bolt directly shearing. The results show that the vertical shear force in the K-joint region is due to the axial force difference of adjacent Internode chords, and the direct shear failure of key pin reinforcement and connecting bolt is the main cause of shear failure in the joint zone. Its shear capacity is mainly provided by key pin reinforcing bar and connecting bolt. The nonlinear simulation model of K shape node region can reflect the failure pattern of the node area, and the ultimate bearing capacity and load-displacement curves are in good agreement with the experimental results.
【作者单位】：东南大学土木工程学院;江苏省交通科学研究院股份有限公司;
【基金】：江苏省自然科学基金面上资助项目(BK2009028) 江苏省交通科学研究计划资助项目(2014Y01)~~
【分类号】：U446

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