【作者】 苏志德；

【导师】 于敬海；

【作者基本信息】 天津大学 ， 结构工程， 2007， 硕士

【摘要】 分离式和整体式增层结构体系是工程实践中采用的加层结构形式,由于分离式增层结构体系中的新增套建部分与一般新建房屋相同,因此可参考相应规范对其进行抗震设计;而整体式增层结构的抗震设计却没有明确规定。然而分离式增层结构体系有其固有的缺陷,如底层柱计算长度过大、造价高、占用场地较大等,使其应用受到一定限制。整体式增层结构体系虽然能较好地弥补分离式增层结构体系的不足,但由于其受力计算较复杂,国内尚缺乏对其抗震性能、计算模型和抗震设计方法深入系统的试验和研究。基于上述背景,本文采用ETABS和SATWE两种结构分析计算软件建立有限元分析模型,详细对比分析了分离式和整体式两种增层体系的动力性能,并且从地震作用、楼层剪力、侧移和层间位移角等方面对比其在多遇水平地震作用下的受力和变形性能,选用地震波对二者进行弹性时程分析以对比验证;并且考虑充分合理利用旧房结构潜力,说明整体式增层结构体系是一种较为合理和经济的方案。进一步通过不同方案对比,分析外套新建结构、旧房、水平链杆等内部因素和外部因素—场地对整体式增层结构体系协同抗震性能的影响。对比分析结果表明:外套新建结构的抗侧刚度和平面布置对整体式增层结构体系有显著影响,而旧房楼层剪力分布与未增层时的分布相反,水平链杆的刚度和连接方式对新旧结构的协同工作也有重要影响。而后采用EPDA软件建立有限元分析模型,通过分析楼层剪力和层间位移角研究整体式增层结构体系在罕遇地震下的受力和弹塑性变形性能;并且分析此类增层结构体系塑性铰的出现顺序和部位,找出结构的薄弱环节,为今后此类工程的设计和施工提供有价值的参考。更多还原

【Abstract】 The separate and incorporated structure-spanning-structure are two infrastructures of story-adding in practice. Because separate structure-spanning-structure is the same as general building, its seismic design method can refer to the related Chinese codes, but it is difficult to find some specific codes for the incorporated one. However, the separated infrastructure is still restricted in using because of its inherent drawbacks, such as the oversized bottom columns, high cost and the large occupation. Although incorporated infrastructure can overcome previous weaknesses, due to its complicated performance under stress, there is no systematic experimental study and theoretical analysis for its seismic behavior, calculative model and seismic designation in china.On the previous background, ETABS and SATWE are applied to analyze the dynamic and seismic behavior of the separate and incorporated structure-spanning-structure. The results can be validated through time-history analysis. Making good use of the potential of the existing building, it can be concluded that the incorporated infrastructure is better than the separate one.Through further comparison of different plan, analyzing the internal and external factors could be analyzed to the incorporated structure-spanning-structure system. The internal factors include the outer-jacketing structure, the existing building and the connecting-rod. The external factor is the site. The results show that the structure system and lateral stiffness of the new building have very significant influence on the collaborative work, but the shear force of the existing building distributed on each floor is opposite. At the same time, stiffness and connection of the connecting-rod also can influence the performance of the incorporated infrastructure. Then in use of EPDA, we can know the behavior of the incorporated infrastructure under rare seism through analyzing the shear force and displacement angle. The weaknesses can be also found through analyzing the position and generate order of plastic hinges. All of these can provide the valuable project experience for the future.更多还原