地铁车辆段上盖超限结构抗震计算分析(任务书,开题报告,论文17000字)
摘 要
随着我国城市轨道交通的进一步发展，局限于有限的城市土体资源，地铁车辆段及其上盖物业开发的模式得到了青睐，并发展迅速。但由于车辆段盖下需考虑线路等因素，易导致盖下柱网和盖上结构的柱网不一致、大底盘多塔楼等问题，故盖上结构一般为超限结构，必须按照相关规范要求，对盖上超限结构进行抗震计算分析。
论文以宁波轨道交通某车辆段上盖超限结构为研究对象，在介绍其结构体系、设计参数的基础上，对超限情况进行了详细的归类，明确了超限项目；然后根据工程特点，建立了相应的计算分析模型，使上部结构柱能落到下部转换层轴网上，节点传力可靠；最后采用基于性能目标的抗震设计方法，运用多软件对结构及重要构件进行了小震弹性分析、小震弹性时程分析、中震等效弹性分析、中震和大震不屈服验算。计算分析结果表明：（1）第一、二阶振型分别以X和Y向的平动为主，第三振型以扭转为主，扭转周期比小于0.85，结构在多遇地震作用下能够达到性能水准1的要求；（2）时程分析结果表明规范所用振型分解反应谱法具有可靠性；（3）结构在中震、大震下层间位移角未超过规范限值，关键构件框架柱满足受剪不屈服目标。总体而言，该工程结构体系满足预设的性能目标，但结构方案有不够合理的地方，提出以下加强措施：（1）大震下角部剪力值逼近抗剪承载力，建议使用型钢混凝土柱，增大结构整体刚度与承载力；（2）结构主要振型周期与规范谱地震动卓越周期相近，应采取隔震等方式延长周期。论文研究方法和技术方案可供类似工程参考借鉴。
关键词： 地铁车辆段；上盖物业；超限设计；性能设计
Abstract
With the further development of urban rail transit and limitation of urban soil resources in China, subway depot and its cover property development model has been favored and developed rapidly. But considering the subway line and other factors, it is easy to lead to inconsistent between the columns on and under the cover, large chassis with multi-towers and other issues, so the structure is generally overrun structure and must carried out the seismic analysis in accordance with the relevant codes.
Based on the introduction of the structural system and design parameters of a car depot in Ningbo, this paper makes a detailed classification of the overrun situation and clarifies the overrun project. Then, according to the characteristics of the project, the corresponding calculation and analysis model is established, so that the upper structure column can fall on the lower onversion layer axis network. Finally, based on the performance seismic design method, the use of multi-software structure making important components of the small earthquake analysis, small earthquake elastic time history analysis, mid-earthquake equivalent elasticity analysis, mid-earthquakes and large earthquakes without yield to be checked. The results show that: (1) The first and second modes are mainly tilted in X and Y directions, the third modes are mainly twisted, and the torsional period is less than 0.85. The structure can reach Standard One. (2) The results of the time-history analysis show that the vibration spectrum of the model is reliable. (3) The drift angle between layers is not higher than the specification limit in the middle and large earthquakes, and the key components can satisfy the shear non-yield target. In general, the engineering structure system can meet the default performance objectives, but the structural program is not reasonable enough to put forward the following measures to strengthen: (1) The shear force of columns on the corner are near the shear bearing capacity, the proposed use of steel reinforced concrete column may increase the overall structural stiffness and bearing capacity; (2) the structure of the main mode cycle and standard spectrum of vibration cycle are similar, so some method like isolation should be taken to extend the cycle. The research methods and technical solutions of the paper can provide reference for similar engineering design.
Key words: Car depot; upper property; exceeding code limit design; performance-based design
目 录
第1章 绪论 6
1.1 引言 6
1.2 国内外研究现状 6
1.2.1 地铁上盖物业 6
1.2.2 基于性能的抗震设计 7
1.3研究内容 8
第2章 工程概况 10
2.1 项目概况 10
2.2 结构超限判别 13
2.3 抗震性能水准确定 15
第3章 小震计算分析 16
3.1小震弹性计算及对比分析 16
3.1.1 计算软件和计算模型 16
3.1.2 弹性分析计算结果 17
3.1.3 小震弹性分析小结 25
3.2 小震弹性时程计算分析 25
3.2.1 地震波选用 25
3.2.2 时程分析与反应谱法结果对比 30
3.2.3 小震弹性时程分析小结 33
第4章 中震等效弹性和大震等效弹性计算分析 35
4.1 中震分析 35
4.1.1中震等效弹性计算 35
4.1.2中震不屈服计算 38
4.1.3中震验算结论 41
4.2 大震分析 42
4.2.1大震不屈服计算 42
4.2.2大震验算结论 43
第5章 结论与展望 44
5.1 主要结论 44
5.2 后续研究工作 44
致谢 46
参考文献 47 |
