带混凝土楼板的钢框架梁柱弱轴连接节点滞回性能试验研究

发布时间：2018-07-16 16:30

【摘要】：为研究组合效应对梁柱弱轴连接滞回性能的影响,进行了梁端截面形式分别采用标准型、削弱型、盖板加强型、扩大翼缘型及加腋型的5个纯钢中节点及5个部分抗剪连接的钢-混凝土组合中节点试件的循环荷载试验。对各试件的试验现象、破坏特征、滞回曲线、钢梁应力(应变)分布及耗能进行了分析。结果表明,除了加腋型试件,钢-混凝土组合节点试件梁下翼缘焊缝均发生不同程度的开裂,但梁上翼缘焊缝及腹板螺栓仍可继续承担较大荷载,而纯钢节点试件梁上下翼缘焊缝均出现开裂,承载力迅速降低;纯钢节点的滞回曲线较组合节点的更为饱满,钢-混凝土组合节点试件的滞回曲线受到腹板螺栓滑移的影响而逐渐呈反S形;正弯矩作用下钢-混凝土组合梁截面中和轴显著上移,梁下翼缘应变水平基本高于纯钢节点的;梁端削弱型节点能较有效地实现塑性铰外移,且其滞回曲线最为稳定,推荐优先选用;焊接质量是影响节点滞回性能的关键,建议蒙皮板采用抗层间撕裂的Z向钢材。
[Abstract]:In order to study the effect of combination effect on the hysteretic performance of Liang Zhu weak axis connection, the beam end cross-section is divided into four types: standard type, weakened type and strengthened cover type. The cyclic load tests of 5 steel joints with flange and axillary type and 5 steel / concrete joints with partial shear connections are carried out. The experimental phenomena, failure characteristics, hysteretic curves, stress (strain) distribution and energy dissipation of steel beams are analyzed. The results show that in addition to the axillary specimens, the lower flange welds of the steel-concrete composite joint beams are cracked to varying degrees, but the upper flange welds and web bolts can still bear large loads. On the other hand, the weld seam of the upper and lower flange of the pure steel joint is cracked, and the bearing capacity decreases rapidly, and the hysteretic curve of the pure steel joint is fuller than that of the composite joint. The hysteretic curve of steel-concrete composite joint is gradually inversely S-shaped due to the slip of web bolt, and the section and axis of steel-concrete composite beam move up significantly under positive bending moment, and the strain level of flange below the beam is basically higher than that of pure steel joint. The beam-end weakened joint can realize the plastic hinge outward displacement effectively, and its hysteretic curve is the most stable, it is recommended to choose first. The welding quality is the key to affect the hysteretic performance of the joint. It is suggested that the laminated plate adopt Z-direction steel which is resistant to interlaminar tear.
【作者单位】：长安大学建筑工程学院;
【基金】：国家自然科学基金项目(51278061) 中央高校基本科研业务费专项(310828175002)
【分类号】：TU398.9

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