焊接工艺孔对梁柱节点滞回性能的影响研究  

RESEARCH ON THE EFFECT OF WELDING HOLE ON THE HYSTERESIS BEHAVIOR OF BEAM-TO-COLUMN CONNECTIONS

作　　者：袁晓洒 席学涛 李婷婷[1] 冯少飞 YUAN Xiaosa;XI Xuetao;LI Tingting;FENG Shaofei(School of Civil Engineering, Xijing University, Xi＇ an 710123, China;No. 6 Engineering Corporation Limited of CR20G, Xi＇ an 710032, China)

机构地区：[1]西京学院土木工程学院,西安710123 [2]中铁二十局集团第六工程有限公司,西安710032

出　　处：《钢结构》2017年第11期21-26,共6页Steel Construction

基　　金：国家自然科学基金项目(50678025)

摘　　要：为了研究焊接工艺孔的细部尺寸对钢框架梁柱节点滞回性能的影响,运用有限元软件ABAQUS对10个不同焊缝通过孔细部尺寸的节点试件进行模拟分析。首先,根据已有梁柱节点循环加载试验对有限元建模方法进行有效性验证。然后,分别根据我国GB 50011—2010《建筑抗震设计规范》和美国FEMA-350推荐的焊缝通过孔形式建立有限元模型,研究焊缝通过孔的细部尺寸对节点滞回性能的影响。研究结果表明:采用FEMA-350推荐的焊接工艺孔形式的梁柱节点的初始刚度与我国标准节点相近,但其承载能力较标准节点有所降低,梁下翼缘焊缝处的应力水平明显降低,可以减小焊缝脆断的风险;随着开孔的末端梁腹板距柱翼缘表面的距离a及开孔斜线段的水平长度b的增大,承载能力逐渐降低。综合考虑梁柱节点的滞回性能及梁下翼缘焊缝处应力分布,建议开孔的末端梁腹板距柱翼缘表面的距离a及开孔斜线的水平长度b分别取60 mm和30 mm。In order to study the effect of the part-dimension of the welding hole on the hysteretic behavior of beam-tocolumn connections in steel frame, the finite element software ABAQUS was used to simulate the cyclic performance of the connection for 10 models with different welding hole details. Firstly, based on the existed results of cyclic loading test, the finite element modeling methods were validated through comparing to the test results. Then 10 models were established according to the recommended welding hole form by GB 50011--2010 and FEMA - 350 to study the effect of detailed dimensions of the welding hole on the hysteretic behavior of connections. The results showed that the initial stiffness of connections using the two kinds of recommended welding holes was similar, while the bearing capacity of the connection based on FEMA- 350 was lower than the standard connection based on GB 50011-2010. The stress level of the beam bottom flange weld decreased significantly using the welding access hole form of FEMA - 350, which could reduce the risk of the weld brittle fracture. With the increase of the distance between the end-beam web of the hole and the surface of column flange a and the horizontal length of the inclined line b, the bearing capacity decreased gradually. Considering the hysteresis behavior of beam-to-column connections and the stress distribution of the beam bottom flange welds synthetically, the 60 mm for parameter a and 30 mm for parameter b were recommended.

关 键 词：焊接工艺孔 梁柱节点 有限元分析 滞回性能 

分 类 号：TU391[建筑科学—结构工程] TU758.11