节点域对抗弯钢框架抗震性能影响研究  

Study on the Influence of Panel Zone on Seismic Performance of Steel Moment Resisting Frames

作　　者：俞诗嘉 张锐 陈智慧 YU Shijia;ZHANG Rui;CHEN Zhihui(School of Civil Engineering,Dalian Jiaotong University,Liaoning Dalian 116028,China)

机构地区：[1]大连交通大学土木工程学院,辽宁大连116028

出　　处：《防灾减灾学报》2023年第2期19-25,共7页Journal of Disaster Prevention And Reduction

基　　金：大连交通大学大学生创新创业训练计划项目(202110150044);辽宁省教育厅自然科学研究项目(LJKZ0504)。

摘　　要：为探究抗弯钢框架中节点域对其抗震性能的影响,以美国SAC钢结构计划中提出的20层抗弯钢框架结构为原型,基于ABAQUS建立了能够考虑节点域剪切变形的结构模型(M1-PZ)和不考虑节点域的线性中心模型(M2-noPZ)。将针对美国洛杉矶地区3种超越概率(50年超越概率50%、10%、2%)下设计谱选出的3组各20条地震波作为输入,进行非线性时程分析。对比分析表明,各超越概率下M1-PZ所得各层剪力均大于M2-noPZ。从结构位移反应来看,考虑节点域的剪切变形可更好地体现高阶振型的影响,这种优势会随着结构非线性程度的增加而增大。当地震强度不高时,两种模型结构在底部薄弱层的位移反应相差不大,但当结构非线性程度较高时,M2-noPZ无法准确反映实际出现杆端最大弯矩的位置,使得预估结构最大位移反应偏大。综合分析认为,建立分析模型时有必要考虑节点域的剪切变形。In order to explore the influence of panel zone on seismic performance of steel moment resisting frames,a 20-story steel moment resisting frames proposed in SAC steel structure Project of the United States was taken as the prototype.Based on ABAQUS,the structural model(M1-PZ)which can consider the shear deformation of panel zone and the linear center model(M2-noPZ)which does not consider panel zone were established.Three groups of 20 seismic waves selected for the design spectrum of three exceed⁃ance probabilities(50 years exceedance probability 50%,10%,2%)in Los AngelesUSAwere used as in⁃put for nonlinear time history analysis.The comparative analysis shows that the shear force obtained by M1-PZ is greater than M2-noPZ under each exceedance probability.From the perspective of structural displace⁃ment responseconsidering the shear deformation of panel zone can better reflect the influence of higher order modesand this advantage will increase with the increase of structural nonlinear degree.When the seismic in⁃tensity is not highthe displacement response of the two models in the weak layer at the bottom is not much dif⁃ferentbut when the nonlinear degree of the structure is highM2-noPZ can not accurately reflect the actual po⁃sition of the maximum bending moment of the rod endresulting in a larger estimated maximum displacement response of the structure.The comprehensive analysis shows that it is necessary to consider the shear defor⁃mation of the panel zone when establishing the analysis model.

关 键 词：钢框架 节点域 有限元分析 数值模型 时程分析 地震反应 抗震性能 

分 类 号：P642.21[天文地球—工程地质学]