高层密集框桁架仓储结构力学性能研究

发布时间：2018-04-28 03:11

本文选题：高层密集框桁架仓储结构体系 + 背拉支撑系统　；参考：《东南大学》2015年硕士论文

【摘要】：密集框桁架仓储结构横向表现为桁架结构、纵向表现为“弱框架”结构,其具有构件密集的特点。广泛应用于物流存储的组装式货架为该体系的典型代表。在课题组前期研究的基础上,本文重点研究带背拉支撑的高层组装式货架结构体系,其间加入多层结构分析结果,以作对比。首先介绍了新型整体式节点货架的构成特点、结构作用与传递路径,对比分离式与整体式节点构成特点、原有背拉体系与新型背拉体系布置形式；接着,研究隔撑短梁竖向偏心、水平支撑系统、背拉数量的影响；然后,基于节点刚度变化对单根抱扣梁、高层无侧移结构、多层有侧移结构进行整体性能分析,给出合适的节点刚度范围并验证现有整体式节点刚度的合理性；在此基础上,分析不同阻尼比对于结构性能影响；最后,对单根抱扣梁最佳工作荷载参数化分析,在常用工作荷载下获得多卷边柱截面选型表,并给出整体式节点货架经济性指标。得到主要结论如下：1、柱顶侧移与层间侧移角随隔撑短梁偏心增大而增大,隔撑短梁偏心布置使结构不安全,隔撑短梁应尽可能不偏心或少偏心；2、为保证货架外侧立柱能满足强支撑条件,需布置背拉体系且在结构各层设置水平支撑;3、背拉数量增加对结构整体X向平动限制明显,整体侧移量与层间侧移角下降,基于经济性考虑每4-7列柱片设置1道背拉,即1道背拉影响7m-14m范围；4、采用增强背拉区立柱并优化其他立柱截面这一措施,可降低结构侧移量与用钢量,标准榀较单榀降低效果更显著；5、对于高层无侧移结构与多层有侧移结构,节点刚度的增加使结构基本周期、结构柱顶侧移、最大层间侧移角、梁挠度、柱应力比减小,有侧移体系柱应力减小较无侧移体系明显,节点刚度为3×10^8N·mm/rad时较合适；6、整体式节点货架较分离式节点货架柱顶侧移、最大层间侧移角、钢梁挠度、梁、柱应力比均有减小；7、阻尼比0.05较0.035,货架体系结构柱顶侧移量、最大层间侧移角、柱应力比、基底剪力减小；8、高层无侧移整体式节点货架节省用钢量随抗震设防烈度及特征周期值的增加呈阶梯状增加,最高可达33.8%；多层有侧移整体式节点货架节省用钢量随着结构承载的增加而增加,最高可达30.3%。
[Abstract]:The storage structure of dense frame truss is shown as truss structure in transverse and "weak frame" structure in longitudinal direction, which has the characteristics of dense structure. The assembled shelf, which is widely used in logistics storage, is a typical representative of this system. On the basis of the previous research of the research group, this paper focuses on the research of the high-rise assembled shelf structure system with back pull support, and adds the results of the multi-layer structure analysis to make a comparison. This paper first introduces the structure characteristics, structure function and transfer path of the new integral node shelf, compares the structural characteristics of the separate and integral joints, the arrangement of the original backpull system and the new backpull system, and then the layout of the original backpull system and the new backpull system. The effects of vertical eccentricity, horizontal bracing system and back pull quantity on short spacer beam are studied. Then, based on the change of node stiffness, the overall performance of single clasped beam, high rise structure without lateral displacement and multi-story lateral moving structure is analyzed. The proper joint stiffness range is given and the rationality of the existing integral joint stiffness is verified. On this basis, the effects of different damping ratios on the structure performance are analyzed. Finally, the parameterized analysis of the optimal working load of a single clasp beam is made. The cross-section selection table of multi-crimped column is obtained under common working load, and the economic index of integral joint shelf is given. The main conclusions are as follows: (1) the angle between column top and interlayer lateral displacement increases with the increase of eccentricity of spacer short beam, and the eccentric arrangement of spacer short beam makes the structure unsafe. The short beam should be as uneccentric or less eccentric as possible. In order to ensure that the column on the outside of the shelf can meet the strong supporting conditions, it is necessary to arrange the backpull system and install horizontal support in each layer of the structure. The increase in the number of back pull obviously limits the overall X-direction translation of the structure. The overall lateral displacement and the angle of interlaminar lateral shift are decreased. Based on the economic considerations, one back pull is set for every 4-7 column sheet, that is, one back pull affects the 7m-14m range. The method of strengthening the back pull area column and optimizing the cross section of other columns is adopted. It can reduce the amount of lateral displacement and steel used in the structure, and the reduction effect of the standard model is more remarkable than that of the single one. For the high-rise structure with no lateral displacement and multi-story lateral displacement, the increase of node stiffness makes the basic period of the structure, the top of the structure column sideways and the maximum angle of lateral displacement between layers. The beam deflection and column stress ratio decrease, the column stress of the system with lateral displacement decreases more obviously than that of the non-lateral displacement system, the node stiffness is 3 脳 10 ^ 8N mm/rad, the integral joint shelf is more suitable to move sideways than the separated joint shelf top, the maximum interlayer lateral displacement angle, the deflection of steel beam, the maximum interlayer lateral angle, the steel beam deflection and the beam, The ratio of column stress to column stress decreased by 7, damping ratio was 0.05 to 0.035, column top displacement, maximum interlaminar displacement angle, column stress ratio, The base shear force is reduced by 8, and the steel saving amount of the non-lateral integral joint shelf increases with the increase of seismic fortification intensity and characteristic period value, and increases in step shape with the increase of seismic fortification intensity and characteristic period value. The maximum amount of steel saved by the multi-layer side-shift integral joint shelf increases with the increase of the structure load, and the maximum is 30.3%.
【学位授予单位】：东南大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TU973

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