高层斜交网格筒结构体系剪力滞后效应研究  

Research of shear lag effect on high-rise diagrid tube structural system

作　　者：史庆轩[1] 任浩[1] 戎翀 

机构地区：[1]西安建筑科技大学土木工程学院,西安710055

出　　处：《建筑结构》2016年第4期1-7,共7页Building Structure

基　　金：国家自然科学基金资助项目(51478382;51178380);教育部长江学者和创新团队发展计划(IRT13089)

摘　　要：利用SAP2000建立不同几何参数的高层斜交网格筒结构模型,在水平风荷载作用下对其进行弹性分析。介绍了高层斜交网格筒结构的剪力滞后现象与基本特点,研究了高层斜交网格筒结构在水平荷载作用下剪力滞后效应的产生机理,并与框筒结构的剪力滞后效应进行对比。分析了斜柱角度、主环梁跨高比、结构高宽比、结构长宽比以及有无角柱对高层斜交网格筒结构剪力滞后效应的影响。结果表明:与框筒结构相比,斜交网格筒结构剪力滞后效应较小;在侧向刚度最优区间内斜交网格筒结构底层剪力滞比随斜柱角度的增大而增大,当斜柱角度超过约80°时,随着斜柱角度的增加底层剪力滞比迅速增大;斜交网格筒结构高宽比越大,结构底层剪力滞比越小;斜交网格筒结构长宽比越大,结构底层剪力滞比越大,剪力滞后效应越明显。By SAP2000,the models of high-rise diagrid tube structure with different geometric parameters were built,and elastic analysis was carried out on these models under the horizontal wind loads. The phenomena and basic characteristics of the shear lag effect of the high-rise diagrid tube structure were introduced. The emergence mechanism of the shear lag effect of the high-rise diagrid tube structure under horizontal loads was studied and the effect was compared with that of a framed tube structure. The influences of angle of inclined column,span-height ratio of ring beam,aspect ratio of the structure,length to width ratio of the structure and existence of corner columns on shear lag effect of the high-rise diagrid tube structure were studied. The results show that the shear lag effect of diagrid tube structure is smaller than that of the framed tube structure. The shear lag ratio at lower layers increases with the increase of the angle of inclined column in optimal lateral stiffness space. When the inclined angle of column is more than about 80°,the shear lag ratio at lower layers increases rapidly with the increase of the angle of inclined column. The shear lag ratio at lower layers increases with the increase of the aspect ratio of the structure,which shows an obvious shear lag effect.

关 键 词：斜交网格筒 剪力滞后效应 节点力 剪力滞比 

分 类 号：TU355[建筑科学—结构工程]