交错桁架延性段双槽钢组合截面弦杆往复弯曲性能试验研究

发布时间：2018-07-01 17:41

本文选题：交错桁架钢框架 + 延性区段　；参考：《建筑结构学报》2017年07期

【摘要】：为研究交错桁架钢框架结构中采用双槽钢组合截面的桁架弦杆延性区段的抗震性能,对8个双槽钢组合截面足尺试件进行往复弯曲荷载作用下的滞回性能试验。重点研究了填板间距、侧向支撑设置、加劲肋设置等因素对该类型截面构件滞回性能的影响。试验结果表明:减小填板间距可减小单肢槽钢平面外长细比,防止组合截面试件发生单肢槽钢失稳,保证双肢槽钢共同工作;塑性铰处设置侧向支撑可有效限制塑性铰区域槽钢发生平面外变形,保证试件不发生整体弯扭失稳,提高构件耗能能力;在塑性铰区域设置加劲肋可限制板件的局部屈曲,保证试件在循环加载过程中的耗能机制为"屈服耗能",提高构件的耗能及转动能力。研究成果可为交错桁架钢框架中双槽钢组合截面桁架弦杆的工程应用提供参考。
[Abstract]:In order to study the seismic behavior of truss chord ductility in staggered truss steel frame structure with double channel steel composite section, hysteretic behavior tests of 8 full-scale specimens with double channel steel composite section under reciprocating bending load were carried out. The effects of the spacing of fill plate, lateral bracing and stiffening rib on the hysteretic performance of this type of cross-section members are studied. The test results show that reducing the spacing of the fill plate can reduce the plane aspect ratio of single-leg channel steel, prevent the instability of single-leg channel steel and ensure the joint work of double-leg channel steel. The lateral bracing at the plastic hinge can effectively limit the out-of-plane deformation of the channel in the plastic hinge area, ensure that the whole bending and torsional instability of the specimen is not occurred, and improve the energy dissipation capacity of the member, and the local buckling of the plate can be limited by setting stiffened ribs in the plastic hinge region. The energy dissipation mechanism of the specimen during cyclic loading is "yield energy dissipation" to improve the energy consumption and rotation ability of the members. The research results can provide a reference for the engineering application of double channel steel composite section truss chords in staggered truss frame.
【作者单位】：西安建筑科技大学土木工程学院;西安建筑科技大学陕西省西部建筑科技国家重点实验室(筹);
【基金】：国家自然科学基金青年科学基金项目(51208412) 陕西省教育厅重点实验室项目(15JS049)
【分类号】：TU391

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