本文選題：鋼結(jié)構(gòu)電視塔 + 擬靜力風(fēng)荷載��； 參考：《鄭州大學(xué)》2013年碩士論文

【摘要】：電視塔是一種典型的高聳結(jié)構(gòu),而鋼結(jié)構(gòu)以其自身的特點(diǎn)往往作為電視塔結(jié)構(gòu)的首選方案。隨著社會(huì)的發(fā)展,電視塔由原來只能發(fā)射訊號(hào)的單功能電視信號(hào)發(fā)射向通訊、展覽、旅游、廣告等文化活動(dòng)和商業(yè)活動(dòng)的大型綜合電視塔發(fā)展。電視塔往往是一個(gè)城市的標(biāo)志性建筑。 電視塔結(jié)構(gòu)屬高柔結(jié)構(gòu),作用在其上的荷載以風(fēng)荷載為主要的控制荷載。由于電視塔的多功能要求,對(duì)于電視塔結(jié)構(gòu)的抗風(fēng)要求越來越高。但鋼結(jié)構(gòu)電視塔對(duì)風(fēng)荷載更為敏感,電視塔在風(fēng)荷載作用下?lián)p壞的例子是屢見不鮮。所以對(duì)于鋼結(jié)構(gòu)電視塔的設(shè)計(jì),風(fēng)荷載的動(dòng)力效應(yīng)計(jì)算顯得尤為重要。 本文首先本文介紹了脈動(dòng)風(fēng)荷載的模擬方法及實(shí)現(xiàn)過程,利用線性濾波法(AR法)模擬風(fēng)速時(shí)程,編寫了脈動(dòng)風(fēng)模擬程序。編制出的風(fēng)荷載時(shí)程曲線程序適合于一般高聳結(jié)構(gòu)脈動(dòng)風(fēng)荷載的模擬。 本文通過對(duì)既有的某不上人電視塔(模型一)和上人電視塔的(模型二)風(fēng)荷載擬靜力分析,按照高聳規(guī)范對(duì)鋼結(jié)構(gòu)電視塔進(jìn)行了0。和45。兩個(gè)風(fēng)向角作用下的風(fēng)荷載響應(yīng)分析,得到電視塔在風(fēng)荷載作用下受45。風(fēng)向控制的結(jié)論。 本文對(duì)比了兩個(gè)不同天線剛度的電視塔風(fēng)荷載擬靜力分析與動(dòng)力時(shí)程分析,分析得到帶天線的電視塔按規(guī)范只考慮第一振型的影響來計(jì)算風(fēng)荷載會(huì)產(chǎn)生較大的誤差。同時(shí)對(duì)兩個(gè)電視塔在有天線和無天線兩種情況下的進(jìn)行了模態(tài)分析,觀察兩個(gè)電視塔在兩種情況下的振型情況,發(fā)現(xiàn)帶有天線的電視塔的高振型影響不可忽略,當(dāng)天線去掉時(shí),高振型影響較小,天線對(duì)電視塔結(jié)構(gòu)的自振頻率影響較為顯著。 本文最后通過改變模型一的三維有限元模型中的天線剛度,進(jìn)行電視塔風(fēng)荷載擬靜力分析結(jié)果與動(dòng)力時(shí)程分析結(jié)果的吻合程度的研究。研究表明,對(duì)于中小型電視塔,天線高度為20米左右,當(dāng)天線頂端與塔身頂點(diǎn)在天線頂點(diǎn)處施加一個(gè)單位力產(chǎn)生的位移比小于5倍時(shí),電視塔整體結(jié)構(gòu)的風(fēng)荷載可按規(guī)范僅考慮第一振型的影響來計(jì)算；若該位移比大于5倍,則電視塔整體結(jié)構(gòu)風(fēng)荷載按時(shí)程分析方法進(jìn)行風(fēng)荷載計(jì)算或?qū)⒁?guī)范中的風(fēng)荷載適當(dāng)乘以一個(gè)放大系數(shù)。
[Abstract]:TV Tower is a typical high rise structure, and the steel structure is often the first choice of TV tower structure because of its own characteristics. With the development of the society, the TV Tower is developed from the original single function television signal transmitting signal to communication, exhibition, tourism, advertising and other cultural activities and commercial activities. The tower is often a landmark in a city.
The structure of TV Tower is a kind of high flexible structure, the load acting on it is mainly controlled by wind load. Because of the multi-function requirement of the TV Tower, the demand for wind resistance of the TV tower structure is getting higher and higher. But the steel structure TV Tower is more sensitive to the wind load, and the example of the damage of the TV Tower under the wind load is common. The design of structure TV Tower is particularly important for calculating the dynamic effect of wind load.
This paper first introduces the simulation method and the realization process of the fluctuating wind load. Using the linear filtering method (AR method) to simulate the wind speed time history, the simulation program of pulsating wind is written. The program of the wind load time history curve is suitable for the simulation of the fluctuating wind load of the general high rise structure.
In this paper, through the static analysis of the wind load of the existing TV Tower (model one) and the upper human TV Tower (model two), the wind load response of the steel structure TV Tower under the action of 0. and 45. two wind angles is analyzed according to the high rise standard, and the conclusion of the control of the 45. wind direction under the wind load is obtained.
In this paper, the quasi static analysis and dynamic time history analysis of the wind load of two TV towers with different antenna stiffness are compared. It is analyzed that the TV Tower with the antenna can only calculate the wind load according to the influence of the first mode of vibration. At the same time, the modal analysis of the two TV towers in two cases with antenna and no antenna is carried out. The vibration mode of two TV towers in two cases is observed. It is found that the high vibration mode of the TV Tower with antenna can not be ignored. When the antenna is removed, the influence of the high vibration mode is smaller. The antenna has a more significant influence on the frequency of the structure of the TV tower.
At the end of this paper, by changing the antenna stiffness in the three-dimensional finite element model of the model one, the agreement between the static analysis results of the wind load of the TV Tower and the result of the dynamic time history analysis is studied. The study shows that the height of the antenna is about 20 meters for the medium and small TV Tower, and when the top of the antenna is applied to the vertex of the antenna at the vertex of the antenna, the antenna is applied to the vertex of the antenna. When the displacement ratio of unit force is less than 5 times, the wind load of the overall structure of the TV tower can be calculated according to the effect of the first vibration mode only. If the displacement ratio is more than 5 times, the wind load of the whole structure of the TV Tower is calculated by the wind load or the wind load in the norm is multiplied by a magnification factor properly.
【學(xué)位授予單位】：鄭州大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2013
【分類號(hào)】：TU391;TU312.1

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