楼梯对框架—抗震墙结构抗震性能的影响分析
发布时间：2018-07-16 20:48
【摘要】：底部框架-抗震墙结构主要用于临街的底部商店上部住宅工程,在我国一些中小城市大量的存在着,尤其是繁华地段的临街建筑中使用较多。而其中以底部两层框架-抗震墙结构最多。汶川地震中,此类房屋破坏严重,其抗震性能有待研究。底部两层框架-抗震墙结构是由框架剪力墙结构和砌体结构组成的复合结构,具有“头重脚轻”、“上刚下柔”的特点。特别是楼梯作为发生地震和火灾时的紧急逃生通道,对主体结构刚度的影响不容忽视。作为2010年陕西省自然科学基础研究项目“地震作用下楼梯参与结构整体计算的仿真分析”的一个分支,本文总结了现有各种分析方法,以一底部两层框架-抗震墙、上部四层砌体结构为研究对象,运用有限元分析软件ETABS,分别建立不含楼梯的模型(模型1)和楼梯布置在结构不同位置的模型(模型2～模型6),用振型分解反应谱法和时程分析法对各个模型的抗震性能进行对比分析。得出如下结论：1)楼梯的存在使框架抗震墙结构的整体刚度增加了约40%。2)楼梯的存在使底部框架-抗震墙结构的自振周期缩短约40%、最大倾覆力矩增加约30%,并且对振型的扭转参与系数、抗侧移刚度、平动、扭转效应都有着显著的影响。因此在结构设计中将楼梯作为一个独立单元参与抗震计算分析是必要的。3)对于楼梯间的主梁、平台梁和承梯梁,建议采取加高梁高和加强配筋。强震来临时,梯柱的上下端节点会出现严重破坏,因此建议在以后的楼梯设计时应保证梯柱的配筋,从而有力的保证楼梯间构件具有足够的抗震能力。4)当楼梯位置从位置1向位置5改变,Y向地震下的顶点最大位移、层间位移和层间位移角逐渐增大,说明楼梯刚度对结构底部框架的扭转变形有很大影响。所以在布置楼梯时,尽量避免将单个楼梯布置在角部或端部,应该沿着建筑物的中线对称布置。
[Abstract]:The bottom frame - aseismatic wall structure is mainly used in the bottom of the upper Storehouse Project on the street. It is widely used in some small and medium-sized cities in our country, especially in the busy streets. The two storey frame - seismic wall structure at the bottom is the most. In Wenchuan earthquake, this kind of building is badly damaged and its seismic performance needs to be studied. The bottom two storey frame - seismic wall structure is a composite structure composed of frame shear wall structure and masonry structure. It has the characteristics of "head and heavy foot light" and "upper rigidity and soft". In particular, staircase is an emergency escape passage for earthquake and fire, and it can not be ignored for the stiffness of the main structure. As the natural science foundation of Shaanxi Province in 2010 A branch of the foundation research project, "the simulation and analysis of the whole calculation of the staircase participation structure under the earthquake action", this paper summarizes the existing analytical methods, and uses a bottom two storey frame - aseismic wall and the upper four layers masonry structure as the research object. The staircase model (model 1) and staircase without staircase are established by the finite element analysis software ETABS. The models (model 2 ~ Model 6) are placed in different positions, and the seismic performance of each model is compared with the vibration mode decomposition response spectrum method and time history analysis. The following conclusions are obtained: 1) the existence of the staircase increases the overall stiffness of the frame aseismic wall structure by about 40%.2) and the existence of the floor ladder makes the bottom frame - aseismic wall structure free of vibration The cycle shortens about 40%, the maximum overturning moment increases by about 30%, and it has a significant influence on the torsion participation coefficient, lateral stiffness, translation and torsional effect. Therefore, it is necessary to take the staircase as an independent unit in the seismic calculation and analysis in structural design. For the main beam of the staircase, the platform beam and the staircase beam, it is suggested to adopt the.3. When the strong earthquake comes, the upper and lower end nodes of the staircase will be seriously damaged. Therefore, it is suggested that the staircase should be reinforced when the staircase is designed so that the staircase members have sufficient seismic capacity.4) to change the staircase position from position 1 to position 5, and the maximum displacement of the Y to the vertex under the earthquake. The interlayer displacement and the interlayer displacement angle gradually increase, indicating that the staircase stiffness has a great influence on the torsional deformation of the bottom frame of the structure. So, when the staircase is arranged, the single staircase should be avoided to be arranged in the corner or end, and should be arranged along the middle line of the building.
【学位授予单位】：西安工业大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：TU352.11
本文编号：2127628
[Abstract]:The bottom frame - aseismatic wall structure is mainly used in the bottom of the upper Storehouse Project on the street. It is widely used in some small and medium-sized cities in our country, especially in the busy streets. The two storey frame - seismic wall structure at the bottom is the most. In Wenchuan earthquake, this kind of building is badly damaged and its seismic performance needs to be studied. The bottom two storey frame - seismic wall structure is a composite structure composed of frame shear wall structure and masonry structure. It has the characteristics of "head and heavy foot light" and "upper rigidity and soft". In particular, staircase is an emergency escape passage for earthquake and fire, and it can not be ignored for the stiffness of the main structure. As the natural science foundation of Shaanxi Province in 2010 A branch of the foundation research project, "the simulation and analysis of the whole calculation of the staircase participation structure under the earthquake action", this paper summarizes the existing analytical methods, and uses a bottom two storey frame - aseismic wall and the upper four layers masonry structure as the research object. The staircase model (model 1) and staircase without staircase are established by the finite element analysis software ETABS. The models (model 2 ~ Model 6) are placed in different positions, and the seismic performance of each model is compared with the vibration mode decomposition response spectrum method and time history analysis. The following conclusions are obtained: 1) the existence of the staircase increases the overall stiffness of the frame aseismic wall structure by about 40%.2) and the existence of the floor ladder makes the bottom frame - aseismic wall structure free of vibration The cycle shortens about 40%, the maximum overturning moment increases by about 30%, and it has a significant influence on the torsion participation coefficient, lateral stiffness, translation and torsional effect. Therefore, it is necessary to take the staircase as an independent unit in the seismic calculation and analysis in structural design. For the main beam of the staircase, the platform beam and the staircase beam, it is suggested to adopt the.3. When the strong earthquake comes, the upper and lower end nodes of the staircase will be seriously damaged. Therefore, it is suggested that the staircase should be reinforced when the staircase is designed so that the staircase members have sufficient seismic capacity.4) to change the staircase position from position 1 to position 5, and the maximum displacement of the Y to the vertex under the earthquake. The interlayer displacement and the interlayer displacement angle gradually increase, indicating that the staircase stiffness has a great influence on the torsional deformation of the bottom frame of the structure. So, when the staircase is arranged, the single staircase should be avoided to be arranged in the corner or end, and should be arranged along the middle line of the building.
【学位授予单位】：西安工业大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：TU352.11
【参考文献】
相关期刊论文 前1条
1 申跃奎;张涛;王威;;框架结构楼梯的震害分析与设计对策[J];建筑结构;2009年11期
，本文编号：2127628
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