CAJ | 학술논문

针对我国《建筑抗震设计规范》推荐的临界侧向长细比计算公式来源于单调荷载研究结果，并未反映不同抗震等级影响问题，基于抗震等级应与适宜的转动能力相匹配准则，对循环荷载作用下钢梁进行非线性有限元分析。所建模型考虑初始几何缺陷、残余应力影响，并得到试验验证。通过对钢梁端部弯矩比、腹板高厚比、翼缘宽厚比、残余应力分布图式及平面外边界约束条件等5类影响因素数值分析，提出循环荷载作用下钢梁临界侧向长细比计算公式。该公式具有计算精度高、表达形式简单等特点。
침대아국《건축항진설계규범》추천적림계측향장세비계산공식래원우단조하재연구결과，병미반영불동항진등급영향문제，기우항진등급응여괄의적전동능력상필배준칙，대순배하재작용하강량진행비선성유한원분석。소건모형고필초시궤하결함、잔여응력영향，병득도시험험증。통과대강량단부만구비、복판고후비、익연관후비、잔여응력분포도식급평면외변계약속조건등5류영향인소수치분석，제출순배하재작용하강량림계측향장세비계산공식。해공식구유계산정도고、표체형식간단등특점。
The behavior of steel beams under cyclic loading is quite different from that under monotonic loading. However,the formula for critical lateral slenderness ratio recommended in the current Chinese code GB50011-2010 for seismic design of buildings is resulted from research findings for monotonic loading.At the same time,the effect of different seismic grades is not considered in the formula.So it is necessary to be improved.In the paper,the nonlinear finite element analysis of steel beams subjected to cyclic loading was carried out based on the concept that a seismic grade should match a suitable rotation capacity.In the model developed,the influence of initial geometric imperfection and residual stresses was taken into account and validated by other researcher's experimental results.By means of the numerical analysis on five parameters,namely,end-moment ratio,web height-thickness ratio,flange width-thickness ratio,residual stress distribution pattern,out-of-plane boundary condition,the formula for critical lateral slenderness ratio of steel beams under cyclic loading was proposed,with higher accuracy and simpler form.