多层钢框架连续倒塌性能和设计方法研究

发布时间：2018-01-30 18:38

本文关键词： 钢框架连续倒塌有限元分析拆除构件法设计方法　出处：《清华大学》2013年硕士论文　论文类型：学位论文

【摘要】：我国经济建设迅猛发展，每年有大量各种形式包括多层钢框架结构在内的钢结构工程在建设施工。相对于钢结构的设计理论和施工技术的不断提高和完善，我国对钢结构使用周期内的抗连续倒塌问题重视还不足，有关方面的理论和研究还处于起步阶段，与国外相比还有一定的差距。并且国内钢结构工程的实际情况（节点形式和构造等）与国外有一定的差异。本文就多层钢框架的连续倒塌问题进行研究，主要内容包括： (1)以某二层钢框架-组合楼板体系抗倒塌试验为例，运用通用有限元软件ANSYS建立三维有限元模型。详细介绍了在ANSYS/LS-DYNA分析环境下相关的有限元建模技术、参数取值、材料失效准则等，随后运用该方法进行了有限元模型验证。 (2)以某小区行政管理楼为实际工程背景，采用ANSYS软件建立了带楼板的框架有限元模型。采用瞬时加载法在ANSYS/LS-DYNA平台下来模拟倒塌工况的发生，并对剩余结构的倒塌性能进行分析。模拟该多层钢框架结构在单个柱构件失效后以及多个柱失效后的响应情况。 (3)针对不同设计条件(跨度、跨数、层数、荷载、地震烈度、材料强度等)，采用MIDAS软件设计了相应的带楼板多层钢框架结构，为了使框架间抗连续倒塌性能的比较更有说服力，在设计框架时使其承载力储备接近，即框架的承载力满足钢结构设计规范及抗震设计规范的最低要求，随后应用ANSYS/LS-DYNA对这些钢框架的抗连续倒塌性能进行了有限元分析，通过分析比较这些框架在有选择地拆除单柱和多个柱后的框架变形来衡量这些框架的抗连续倒塌性能，随后通过数据处理进一步得到上述的不同设计参数条件对框架抗连续倒塌性能的影响程度。 (4)总结了各国规范有关结构抗连续倒塌性能设计方法，结合已有的分析研究结果，，根据我国钢结构设计规范钢框架结构的实际情况和设计目标，从中提出适合多层钢框架抗连续倒塌性能的相关设计方法原则等，并给出了多层钢框架抗连续倒塌的一些设计建议。
[Abstract]:With the rapid development of China's economic construction, a large number of steel structure projects, including multi-story steel frame structures, are being constructed every year. Compared with the design theory and construction technology of steel structures, the design theory and construction technology are constantly improved and improved. In China, insufficient attention has been paid to the continuous collapse resistance of steel structures in their life cycle, and the relevant theories and studies are still in their infancy. Compared with foreign countries, there is still a certain gap. And the actual situation of domestic steel structure engineering (such as joint form and structure) is different from that of foreign countries. In this paper, the continuous collapse of multi-story steel frame is studied. The main elements include: 1) taking a two-story steel frame-composite floor system as an example. The 3D finite element model is established by using the general finite element software ANSYS. The relevant finite element modeling technology and parameter selection under the ANSYS/LS-DYNA analysis environment are introduced in detail. Then the finite element method is used to verify the failure criterion of the material. 2) taking the administration building of a small district as the actual engineering background. The finite element model of the frame with floor is established by using ANSYS software, and the instantaneous loading method is used to simulate the collapse condition of the ANSYS/LS-DYNA platform. The collapse behavior of the remaining structure is analyzed, and the response of the multi-story steel frame structure after the failure of the single column member and the failure of multiple columns is simulated. According to the different design conditions (span, span, story number, load, seismic intensity, material strength, etc.), the corresponding multi-story steel frame structure with floor slab is designed by MIDAS software. In order to make the comparison of the continuous collapse resistance between frames more convincing, the bearing capacity of the frame is close to that of the steel structure design code and the seismic design code when the frame is designed, that is to say, the bearing capacity of the frame meets the minimum requirements of the steel structure design code and the seismic design code. Then the finite element analysis of the continuous collapse resistance of these steel frames is carried out by using ANSYS/LS-DYNA. The continuous collapse resistance of these frames is measured by analyzing and comparing the deformation of these frames after the selective removal of single column and multiple columns. Then the influence of the different design parameters on the continuous collapse resistance of the frame is obtained by data processing. In this paper, the design methods of continuous collapse resistance of structures in different countries are summarized. According to the existing analysis and research results, according to the actual situation and design objectives of steel frame structures of steel structure design code in China. The relevant design principles suitable for the continuous collapse resistance of multi-story steel frames are put forward, and some design suggestions on the resistance of multi-story steel frames to continuous collapse are given.
【学位授予单位】：清华大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：TU391;TU312.3

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