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  

Experimental investigation on cyclic performance of beam-to-column weak-axis connections with concrete slab in steel frame

作　　者：卢林枫[1] 徐莹璐 郑宏[1] 周天华[1] 

机构地区：[1]长安大学建筑工程学院,陕西西安710061

出　　处：《建筑结构学报》2017年第12期12-21,共10页Journal of Building Structures

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)

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。To experimentally evaluate the composite effect on the cyclic performance of weak-axis column bending connections,ten cruciform joint specimens were tested under reversal of loads,including five bare steel joint（SJ）specimens and five steel-concrete composite joint（CJ） specimens reinforced with partial shear connection. The form of beam-end was designed with standard,reduced,plate covered,widened flange,and welded haunch,respectively.The experimental phenomenon,failure mode,hysteretic curves,strain and stress distribution of steel beam and energy dissipation capacity of each specimen were analyzed and discussed. The results show that beam bottom flange welds of CJ crack in different degrees except the haunch specimen,while the beam top flange welds and web bolts could continue to bear large loads. However,beam top and bottom flange welds of SJ crack,resulting in the abrupt strength degradation. The hysteretic curves of SJ are plumper than that of CJ,since the shape of hysteretic curves of CJ gradually becomes anti S due to the influence of web bolts slippage. The neutral axis of CJ cross-section exhibits a significant upward shift under positive bending,thus developing a larger strain in the bottom flange than that of SJ.The plastic hinge can effectively move away from the column-to-beam connection in the reduced specimens,which have the most stable and reliable cyclic response,thus this joint form is recommended first. The welding quality is the key factor which could influence the hysteretic behavior of joints,and lamellar tearing resistant steel is suggested to be used in skin plates.

关 键 词：钢-混凝土组合节点 弱轴 部分抗剪连接 拟静力试验 滞回性能 

分 类 号：TU393[建筑科学—结构工程] TU317.1