框架结构整体移位中天然地基过渡段沉降规律模拟分析

发布时间：2018-03-07 11:51

本文选题：建筑物整体移位　切入点：框架结构　出处：《河北科技大学》2014年硕士论文　论文类型：学位论文

【摘要】：建筑物整体移位技术对于我国的城市建设、规划和建筑物改造及古建筑的保护具有重要意义,并取得了显著的经济效益、社会效益、环保效益。但移位建筑对于地基基础的作用不同于静止(在建)建筑物:瞬时荷载、动荷载、一次性大荷载,这决定了移位建筑物的地基与基础有其自身的受力特性。建筑物原地基长期受上部荷载作用,沉降变形已趋于稳定;整体移位过程中,轨道地基会因受力固结压缩产生新的沉降。在影响上部结构安全性的各因素中,最主要的为在新旧基础过渡段会产生较大不均匀沉降(即相邻柱脚沉降差)。沉降差的产生不仅会在移位建筑物上部结构中产生附加内力,而且超过一定限值甚至会造成结构构件开裂。虽然许多文献对建筑物整体移位技术的设计和施工进行了研究探讨,但大多数工程仍是依靠技术人员的经验,尚未形成一套完整且成熟的设计理论和施工方法。因此,研究建筑物移位过程中地基沉降变形规律并找出合适的对策对于保证建筑的安全具有重要的意义。在制定过渡段轨道基础设计方案时要考虑两个因素:一是安全因素,要保证移位过程安全可靠;二是做技术经济分析,尽可能在安全可靠的前提下降低造价。针对这些现状,对于框架结构,利用ANSYS有限元软件分析天然地基上轨道基础高度及宽度对沉降变形的影响。结果表明,加大轨道基础的宽度和高度(即刚度)可以减小移位过程中的沉降变形,并对三层、四层框架建筑进行移位模拟,找到了其在移位过程中控制过渡段地基沉降差的对策,得到了所需要的轨道基础最佳截面尺寸组合。本文还对相邻柱脚的最大沉降差的出现位置、不同高度建筑物在移位中地基沉降变形趋势进行了模拟分析。
[Abstract]:The technology of integral displacement of buildings is of great significance to the urban construction, planning, building reconstruction and the protection of ancient buildings in China, and has achieved remarkable economic and social benefits. Environmental benefits. But the effect of the displaced building on the foundation is different from that of the static (under construction) building: instantaneous load, dynamic load, one-off large load, This determines that the foundation and foundation of the displaced building have their own mechanical characteristics. The original foundation of the building has been subjected to the upper load for a long time, and the settlement and deformation have become stable. The new settlement of track foundation will be caused by consolidation and compression. Among the factors that affect the safety of superstructure, The most important thing is that there will be large uneven settlement in the transition section of the new and old foundations (that is, the settlement difference between the adjacent columns.) the settlement difference will not only produce additional internal forces in the displacement of the superstructure of the building, Although many literatures have studied and discussed the design and construction of the whole displacement technology of buildings, most of the projects still rely on the experience of technicians. A complete and mature design theory and construction method have not yet been developed. It is of great significance to study the law of foundation settlement and deformation in the process of building displacement and find out appropriate countermeasures to ensure the safety of building. Two factors should be considered when formulating the design scheme of track foundation in transition section: one is safety factor, the other is safety factor. In order to ensure the safety and reliability of the shift process, the second is to do technical and economic analysis to reduce the cost under the premise of safety and reliability as far as possible. The influence of the height and width of track foundation on natural foundation is analyzed by using ANSYS software. The results show that increasing the width and height of track foundation (i.e. stiffness) can reduce the settlement deformation in the course of displacement. The displacement simulation of the four-story frame building is carried out, and the countermeasures to control the settlement difference in the transition section are found, and the optimum cross section size combination of the track foundation is obtained. The location of the maximum settlement difference between the adjacent column feet is also discussed in this paper. The tendency of foundation settlement and deformation during displacement of buildings with different heights is simulated and analyzed.
【学位授予单位】：河北科技大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TU433;TU746.4

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