本文選題：混合結(jié)構(gòu) + 等效阻尼比�。� 參考：《蘭州理工大學》2013年碩士論文

【摘要】：隨著工業(yè)技術(shù)的發(fā)展,建筑結(jié)構(gòu)的形式已越來越多元化,混合結(jié)構(gòu)已成為土木工程師經(jīng)常遇到的結(jié)構(gòu)類型。混合結(jié)構(gòu)整體阻尼的確定顯得尤為重要,它將直接影響結(jié)構(gòu)抗震分析結(jié)果的可靠性。對于單一材料結(jié)構(gòu)的阻尼比規(guī)范中有著明確的規(guī)定,但是對于混合結(jié)構(gòu),由于阻尼機理的復雜性,其等效阻尼比目前還沒有給出統(tǒng)一的科學的取值。該文針對剪切型加層混合結(jié)構(gòu)、一般多高層以及超高層混合結(jié)構(gòu)的阻尼比進行了探討和分析,具體研究分析內(nèi)容如下： (1)闡述混合結(jié)構(gòu)的發(fā)展及應(yīng)用前景,指出目前混合結(jié)構(gòu)等效阻尼比的取值存在的問題,并介紹現(xiàn)階段國內(nèi)外在混合結(jié)構(gòu)等效阻尼比研究方面的科研現(xiàn)狀和研究成果。 (2)探討現(xiàn)有的各種結(jié)構(gòu)阻尼理論的發(fā)展概況、適用范圍及優(yōu)缺點,分析阻尼的實質(zhì)、常用的計算假定以及給出阻尼參數(shù)具體的表達方法。 (3)介紹模態(tài)參數(shù)識別的概念以及參數(shù)識別的理論背景,研究分析數(shù)字信號分析系統(tǒng)的一般原理和參數(shù)識別的主要過程。 (4)對于剪切型加層混合結(jié)構(gòu),從復阻尼假定出發(fā),通過能量守恒原理推導出了其在雙向振動下的等效阻尼比的簡化公式；同時用SAP2000有限元軟件建立一個鋼與鋼筋混凝土混合結(jié)構(gòu)的模型進行分析,并用該簡化公式計算等效阻尼比,然后通過設(shè)置兩種驗證方案進行對比分析,結(jié)果證明該簡化公式是可適用的。 (5)對于一般多高層結(jié)構(gòu),應(yīng)用ANSYS有限元軟件模擬振動臺模型試驗,通過輸入白噪聲并求出測點的響應(yīng)信號,然后基于模態(tài)參數(shù)識別原理在頻域內(nèi)用MATLAB語言分別按照有理分式多項式法和正交多項式法編程求解結(jié)構(gòu)的阻尼比。通過仿真分析對比結(jié)果表明了該方法及MATLAB程序的有效性和可行性。最后得出,借助于ANSYS有限元軟件具有的材料阻尼單元建模功能,運用以上方法能夠為多高層混合結(jié)構(gòu)的等效阻尼比的求解提供了一種新的思路和計算方式。 (6)針對超高層混合結(jié)構(gòu),應(yīng)用Etabs有限元軟件對其進行動力分析,在構(gòu)建阻尼矩陣時,通過采取各種阻尼比值作為不同的計算工況,對比分析出阻尼特性對超高層混合結(jié)構(gòu)的動力響應(yīng)影響,結(jié)果表明對同一超高層混合結(jié)構(gòu),即使阻尼比相差約1%時,也會引起結(jié)構(gòu)體系振動響應(yīng)相對誤差20%左右的變化,相差約2%時,更是達到了40%的變化。
[Abstract]:With the development of industrial technology, the form of building structure has become more and more diversified, and hybrid structure has become a common structural type encountered by civil engineers. It is very important to determine the damping of hybrid structures, which will directly affect the reliability of seismic analysis results. The damping ratio of a single material structure is clearly defined in the code, but for a hybrid structure, due to the complexity of the damping mechanism, the equivalent damping ratio has not yet given a unified scientific value. In this paper, the damping ratio of shear-type hybrid structure, multi-tall and super-tall hybrid structures is discussed and analyzed. The main contents are as follows: 1) the development and application prospects of hybrid structures are described. It is pointed out that there are some problems in the selection of equivalent damping ratio of hybrid structures at present. This paper also introduces the present situation and achievements of the research on the equivalent damping ratio of hybrid structures at home and abroad. (2) the development situation, application scope, advantages and disadvantages of the existing structural damping theories are discussed, and the essence of damping is analyzed. This paper introduces the concept of modal parameter identification and the theoretical background of parameter identification. The general principle of digital signal analysis system and the main process of parameter identification are studied. Based on the energy conservation principle, the simplified formula of equivalent damping ratio under bidirectional vibration is derived, and a model of steel-reinforced concrete mixed structure is established by using SAP2000 finite element software. The simplified formula is used to calculate the equivalent damping ratio, and then the two verification schemes are compared and analyzed. The results show that the simplified formula is applicable to the general multi-tall structures. The finite element software ANSYS is used to simulate the shaking table model test, and the response signal of the measuring point is obtained by inputting the white noise. Then the damping ratio of the structure is calculated by the rational fraction polynomial method and the orthogonal polynomial method in the frequency domain based on the modal parameter identification principle. The simulation results show that the method and MATLAB program are effective and feasible. Finally, with the help of ANSYS finite element software, the modeling function of material damping element is obtained. The above method can provide a new way of thinking and calculation for solving the equivalent damping ratio of multi-high-rise hybrid structures. (6) for super-tall hybrid structures, the Etabs finite element software is used to carry out the dynamic analysis. In the construction of damping matrix, by taking various damping ratios as different calculation conditions, the effects of damping characteristics on the dynamic response of super-tall hybrid structures are compared and analyzed. The results show that for the same super-tall hybrid structures, Even when the damping ratio is about 1, the relative error of vibration response of the structural system will change by about 20%, and when the difference is about 2, the variation will reach 40%.
【學位授予單位】：蘭州理工大學
【學位級別】：碩士
【學位授予年份】：2013
【分類號】：TU311.3

【參考文獻】

相關(guān)期刊論文 前10條

1 王依群,李忠獻;不同阻尼特性材料組合結(jié)構(gòu)的彈塑性動力時程響應(yīng)計算[J];地震工程與工程振動;1999年02期

2 朱鏡清,朱敏;復阻尼多自由度系統(tǒng)動力分析的模態(tài)疊加法[J];地震工程與工程振動;2004年01期

3 李鵬;王元豐;;黏性阻尼與復阻尼對鋼筋混凝土框架結(jié)構(gòu)地震響應(yīng)影響的分析[J];地震工程與工程振動;2007年03期

4 汪大洋;周云;王燁華;丁鯤;;粘滯阻尼減震結(jié)構(gòu)的研究與應(yīng)用進展[J];工程抗震與加固改造;2006年04期

5 薛彥濤;韋承基;孫仁范;史鐵花;韓雪;;采用不同材料加層時結(jié)構(gòu)阻尼比計算方法(應(yīng)變能法)[J];工程抗震與加固改造;2008年02期

6 李慧;杜永峰;狄生奎;屠錦敏;楊文俠;李慶福;;疊層橡膠隔震支座的低溫往復試驗及等效阻尼比推算[J];蘭州理工大學學報;2006年05期

7 翟長海;謝禮立;張茂花;;阻尼對工程結(jié)構(gòu)等延性地震抗力譜的影響分析[J];哈爾濱工業(yè)大學學報;2006年10期

8 許靜,朱涵,劉春生,師燕超;橡膠集料混凝土阻尼比的初步試驗研究[J];混凝土;2005年11期

9 唐謝興;張友亮;;結(jié)構(gòu)動力時程分析中的阻尼問題研究[J];建筑結(jié)構(gòu);2006年S1期

10 周向陽;張其林;;組合結(jié)構(gòu)等效阻尼比的確定及在有限元計算中的應(yīng)用[J];計算機輔助工程;2007年03期

相關(guān)碩士學位論文 前2條

1 梁博;鋼框架—混凝土筒體混合結(jié)構(gòu)抗震性能振動臺試驗研究[D];西安建筑科技大學;2005年

2 田慧;鋼筋混凝土框架頂鋼結(jié)構(gòu)加層抗震分析[D];天津大學;2007年

，

本文編號：2049051