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《建筑科学与工程学报》[ISSN:1673-2049/CN:61-1442/TU]

卷:

35卷

期数:

2018年01期

页码:

40-51

栏目:

出版日期:

2018-01-30

文章信息/Info

Title:

Test on Seismic Behavior of Diaphragm-through Irregular Joints of Lightweight Aggregate Concrete-filled Square Steel Tubular Column and H-section Steel Beam and Steel Box Beam

作者:

王万祯，李 华，郭鸣鸣，朱 放，孙韶江

宁波大学建筑工程与环境学院

Author(s):

WANG Wan-zhen, LI Hua, GUO Ming-ming, ZHU Fang, SUN Shao-jiang

Faculty of Architectural, Civil Engineering and Environment, Ningbo University

关键词:

方钢管轻骨料混凝土柱-H形梁与箱形梁异形节点; 循环加载试验; 抗震性能; 承载力; 塑性转角; 耗能能力

Keywords:

irregular joint of lightweight aggregate concrete-filled square steel tubular column and H-section steel beam and steel box beam;  cyclic loading test;  seismic performance;  bearing capacity;  plastic rotation;  energy dissipation capacity

分类号:

-

DOI:

-

文献标志码:

A

摘要:

对圆弧加强隔板贯通方钢管轻骨料混凝土柱-H形梁与箱形梁异形节点和基本型异形节点进行循环加载试验，研究了贯通隔板圆弧扩大头构造对异形节点抗震性能的影响，获得了该类节点的破坏模式、滞回性能、承载力和塑性转角等抗震性能参数。基于试验结果和力学分析，建议了异形节点域的抗弯、抗剪计算模型，推导了异形节点域的抗弯、抗剪承载力计算公式。结果表明：基本型异形节点滞回曲线劣化明显，节点在刚度较大、几何突变的箱形梁翼缘对接焊缝边缘脆断；隔板圆弧加强异形节点的滞回曲线饱满，承载能力和刚度退化不明显，主要破坏模式为在隔板圆弧加强区形成塑性铰，梁翼缘对接焊缝延性开裂；加载至节点破坏时，贯通隔板与柱壁板间焊缝未发生撕裂破坏，节点域内轻骨料混凝土未压碎或拉裂，轻骨料混凝土与隔板和柱壁板间未发生剥离或滑移；隔板圆弧加强异形节点的塑性转角可达0.038~0.056 rad，承载力较基本型异形节点提高21.5%~56.2%。

Abstract:

Diaphragm-through irregular joints of lightweight aggregate concrete-filled square steel tubular column and H-section steel beam and steel box beam, including irregular joints with strengthened arc junctures and traditional irregular joint, were tested under cyclic loading to comparatively study on the influence of strengthened arc junctures on seismic performance of the irregular joints. The failure modes, hysteresis loops, bearing capacities and plastic rotations of the irregular joints were obtained from the experimental results. The flexural and shear calculation models in panel zone of the irregular joint were established and formulas for calculating the flexural and shear capacity were presented for the irregular joint under compression and bending based on the analysis of the experimental results. The tests results indicate that the hysteresis curves of the traditional irregular joint have serious deterioration，and the traditional irregular joint brittle fractures at the edges of butt weld of box steel beam flanges with large rigidity and sharply changed geometry. The hysteresis curves of the diaphragm-through irregular joints are plump shuttle shape，and the hysteresis curves have no obvious bearing capacity and stiffness degradation. The main failure modes of the irregular joints with strengthened arc junctures are plastic hinge formed at the enlarged arc junctures, crack of fillet at welding holes of beam web and ductile fracture of butt weld of beam flanges. There are no tearing failures of welding between diaphragm-through ribs and column walls until joints failure. The post-test examination on the specimens does not reveal any lightweight aggregate concrete materials failure in all tested specimens. The lightweight aggregate concrete and diaphragm-through ribs and column walls are firmly bonded together without separated or slip failure. The plastic rotation of the irregular joints with strengthened arc junctures can research 0.038-0.056 rad, and the bearing capacity may increase by 21.5%-56.2% compared with that of the traditional irregular joint, respectively.

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更新日期/Last Update: 2018-02-01