某超限復雜結構基于性能的抗震設計分析
發(fā)布時間：2018-11-14 13:23
【摘要】：城市現(xiàn)代化催生了越來越多的超高層建筑以及平面、立面特別復雜的建筑,“三水準,兩階段”的常規(guī)設計方法已經(jīng)不能充分滿足這些建筑結構性能和安全設計要求,我們稱這些高度和復雜程度超出規(guī)范規(guī)定限值的建筑結構為超限結構。結構超限可能會產生應力集中,扭轉效應劇烈,地震作用下整體穩(wěn)定性和抗傾覆力降低等問題,對結構抗震性能極其不利。我國抗震規(guī)范所提出的“三水準,兩階段”的結構抗震設計方法只是在一定程度上考慮了某些基于性能的抗震設計思想,以往對于一些復雜結構和超高結構的設計往往只是建立在定性分析和概念設計的基礎上,如何基于性能要求和目標,探究合適的抗震分析設計方法,對超限復雜結構進行抗震分析,保證實現(xiàn)結構性能的可能性正是本文的研究目的。本文通過總結超限不規(guī)則結構的發(fā)展概況,闡述了超限復雜工程探討了基于性能的抗震設計(PBSD)的基本原理和研究方法,并結合一個典型的超限復雜工程實例,介紹了超限結構判別方法,基于本工程的性能目標,討論了本工程基于性能的抗震設計方法,進而量化抗震性能分析結果,針對分析結果,采取相應的超限對策,為以后將基于性能的設計思想運用到其他超限復雜結構中提供理論和實踐探索。論文的主要工作可概括如下：(1)首先對超限復雜結構做了初步設計,并進行了大懸挑部分樓板的舒適度分析。由于結構在不同地震強度等級下的反應是一種連續(xù)變化的過程,彈性和塑性變形也僅是相對的,在此假定結構在小震下幾乎完全處于彈性狀態(tài),而在中震下結構整體處于彈性階段,但初步向部分塑形過度,所以將小震抗震性能分析包含在中震分析中,制定了中震、大震作用下的性能目標。(2)其次,對比進行SATWE程序與MIDAS程序對超限復雜結構在設防地震下的彈性設計分析,整體把握超限結構在中震下的抗震性能,并補充設防地震下的彈性時程分析。按照中震可修原則,重點驗算了主抗側力構件(剪力墻抗剪驗算和樓板應力分析),同時對超限的關鍵部位做相應的包絡驗算分析,以實現(xiàn)中震下結構能達到預定的性能目標。(3)最后考察大震作用下,利用Push-over程序對超限復雜結構進行靜力彈塑性分析,分析找出結構薄弱部位或薄弱層,評估結構罕遇地震下抗倒塌能力,基于提前預定的性能目標,分析驗證本工程在大震作用下能否滿足抗震要求。
[Abstract]:Urban modernization has given birth to more and more super-tall buildings and planes, especially complex facades. The conventional design methods of "three levels and two stages" can no longer fully meet the structural performance and safety design requirements of these buildings. We call these building structures whose height and complexity exceed the limits specified in the code. The problems of stress concentration, severe torsion effect and the reduction of overall stability and anti-capsizing force under earthquake will be extremely disadvantageous to the seismic performance of the structure. The "three-level, two-stage" seismic design method proposed in the seismic code of our country only considers some performance-based seismic design ideas to a certain extent. In the past, the design of some complex structures and super-high structures was usually based on qualitative analysis and conceptual design, how to explore the appropriate seismic analysis design method based on the performance requirements and objectives. The purpose of this paper is to make seismic analysis of complex structures beyond the limit to ensure the possibility of achieving structural performance. In this paper, the basic principle and research method of performance-based seismic design (PBSD) are discussed by summing up the general situation of the development of over-limit irregular structures, and combining with a typical example of over-limit complex engineering. Based on the performance objectives of the project, this paper discusses the performance-based seismic design method of the project, and then quantifies the results of the seismic performance analysis. According to the analysis results, the corresponding over-limit countermeasures are adopted. It provides a theoretical and practical exploration for the application of performance-based design to other complex structures. The main work of this paper can be summarized as follows: (1) the initial design of the overrun complex structure is made, and the comfort analysis of the large cantilever part of the floor is carried out. Because the response of the structure under different earthquake intensity levels is a continuous process, elastic and plastic deformation are only relative. It is assumed that the structure is almost completely elastic under the small earthquake. But the whole structure under moderate earthquake is in the elastic stage, but the initial shape is over, so the seismic performance analysis of small earthquake is included in the analysis of medium earthquake, and the performance target under the action of medium earthquake and large earthquake is established. (2) secondly, This paper compares the elastic design analysis of complex structures with SATWE program and MIDAS program under seismic fortification, grasps the seismic behavior of over-limited structures under moderate earthquake as a whole, and complements the elastic time-history analysis of seismic fortification. According to the repairable principle of moderate earthquake, the main anti-lateral force components (shear wall shear resistance and floor stress analysis) are mainly checked and analyzed. In order to achieve the performance target of the structure under moderate earthquake. (3) finally, under the action of strong earthquake, the static elastic-plastic analysis of the overrun complex structure is carried out by using Push-over program, and the weak position or the weak layer of the structure is found out. In order to evaluate the anti-collapse ability of structures under rare earthquakes, based on the predefined performance objectives, this paper analyzes and verifies whether the project can meet the seismic requirements under the action of large earthquakes.
【學位授予單位】：遼寧工程技術大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：TU352.11
本文編號：2331273
[Abstract]:Urban modernization has given birth to more and more super-tall buildings and planes, especially complex facades. The conventional design methods of "three levels and two stages" can no longer fully meet the structural performance and safety design requirements of these buildings. We call these building structures whose height and complexity exceed the limits specified in the code. The problems of stress concentration, severe torsion effect and the reduction of overall stability and anti-capsizing force under earthquake will be extremely disadvantageous to the seismic performance of the structure. The "three-level, two-stage" seismic design method proposed in the seismic code of our country only considers some performance-based seismic design ideas to a certain extent. In the past, the design of some complex structures and super-high structures was usually based on qualitative analysis and conceptual design, how to explore the appropriate seismic analysis design method based on the performance requirements and objectives. The purpose of this paper is to make seismic analysis of complex structures beyond the limit to ensure the possibility of achieving structural performance. In this paper, the basic principle and research method of performance-based seismic design (PBSD) are discussed by summing up the general situation of the development of over-limit irregular structures, and combining with a typical example of over-limit complex engineering. Based on the performance objectives of the project, this paper discusses the performance-based seismic design method of the project, and then quantifies the results of the seismic performance analysis. According to the analysis results, the corresponding over-limit countermeasures are adopted. It provides a theoretical and practical exploration for the application of performance-based design to other complex structures. The main work of this paper can be summarized as follows: (1) the initial design of the overrun complex structure is made, and the comfort analysis of the large cantilever part of the floor is carried out. Because the response of the structure under different earthquake intensity levels is a continuous process, elastic and plastic deformation are only relative. It is assumed that the structure is almost completely elastic under the small earthquake. But the whole structure under moderate earthquake is in the elastic stage, but the initial shape is over, so the seismic performance analysis of small earthquake is included in the analysis of medium earthquake, and the performance target under the action of medium earthquake and large earthquake is established. (2) secondly, This paper compares the elastic design analysis of complex structures with SATWE program and MIDAS program under seismic fortification, grasps the seismic behavior of over-limited structures under moderate earthquake as a whole, and complements the elastic time-history analysis of seismic fortification. According to the repairable principle of moderate earthquake, the main anti-lateral force components (shear wall shear resistance and floor stress analysis) are mainly checked and analyzed. In order to achieve the performance target of the structure under moderate earthquake. (3) finally, under the action of strong earthquake, the static elastic-plastic analysis of the overrun complex structure is carried out by using Push-over program, and the weak position or the weak layer of the structure is found out. In order to evaluate the anti-collapse ability of structures under rare earthquakes, based on the predefined performance objectives, this paper analyzes and verifies whether the project can meet the seismic requirements under the action of large earthquakes.
【學位授予單位】：遼寧工程技術大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：TU352.11
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