本文選題：混合結(jié)構(gòu) + 等效阻尼比　； 參考：《蘭州理工大學(xué)》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(lái)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�；旌辖Y(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(duì)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(duì)于混合結(jié)構(gòu),由于阻尼機(jī)理的復(fù)雜性,其等效阻尼比目前還沒(méi)有給出統(tǒng)一的科學(xué)的取值。該文針對(duì)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(jìn)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(wèn)題,并介紹現(xiàn)階段國(guó)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(diǎn),分析阻尼的實(shí)質(zhì)、常用的計(jì)算假定以及給出阻尼參數(shù)具體的表達(dá)方法。 (3)介紹模態(tài)參數(shù)識(shí)別的概念以及參數(shù)識(shí)別的理論背景,研究分析數(shù)字信號(hào)分析系統(tǒng)的一般原理和參數(shù)識(shí)別的主要過(guò)程。 (4)對(duì)于剪切型加層混合結(jié)構(gòu),從復(fù)阻尼假定出發(fā),通過(guò)能量守恒原理推導(dǎo)出了其在雙向振動(dòng)下的等效阻尼比的簡(jiǎn)化公式；同時(shí)用SAP2000有限元軟件建立一個(gè)鋼與鋼筋混凝土混合結(jié)構(gòu)的模型進(jìn)行分析,并用該簡(jiǎn)化公式計(jì)算等效阻尼比,然后通過(guò)設(shè)置兩種驗(yàn)證方案進(jìn)行對(duì)比分析,結(jié)果證明該簡(jiǎn)化公式是可適用的。 (5)對(duì)于一般多高層結(jié)構(gòu),應(yīng)用ANSYS有限元軟件模擬振動(dòng)臺(tái)模型試驗(yàn),通過(guò)輸入白噪聲并求出測(cè)點(diǎn)的響應(yīng)信號(hào),然后基于模態(tài)參數(shù)識(shí)別原理在頻域內(nèi)用MATLAB語(yǔ)言分別按照有理分式多項(xiàng)式法和正交多項(xiàng)式法編程求解結(jié)構(gòu)的阻尼比。通過(guò)仿真分析對(duì)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(yùn)用以上方法能夠?yàn)槎喔邔踊旌辖Y(jié)構(gòu)的等效阻尼比的求解提供了一種新的思路和計(jì)算方式。 (6)針對(duì)超高層混合結(jié)構(gòu),應(yīng)用Etabs有限元軟件對(duì)其進(jìn)行動(dòng)力分析,在構(gòu)建阻尼矩陣時(shí),通過(guò)采取各種阻尼比值作為不同的計(jì)算工況,對(duì)比分析出阻尼特性對(duì)超高層混合結(jié)構(gòu)的動(dòng)力響應(yīng)影響,結(jié)果表明對(duì)同一超高層混合結(jié)構(gòu),即使阻尼比相差約1%時(shí),也會(huì)引起結(jié)構(gòu)體系振動(dòng)響應(yīng)相對(duì)誤差20%左右的變化,相差約2%時(shí),更是達(dá)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(xué)位授予單位】：蘭州理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2013
【分類號(hào)】：TU311.3

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本文編號(hào)：2049051