本文關(guān)鍵詞： 單層球面網(wǎng)殼 非均勻荷載 動力穩(wěn)定性 地震作用 幾何缺陷　出處：《長安大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

【摘要】：幾十年來,隨著人民生活水平的不斷提高,社會大踏步的發(fā)展以及科學(xué)技術(shù)的革新與進(jìn)步,空間結(jié)構(gòu)也得到了更快速的發(fā)展與更廣泛的應(yīng)用。現(xiàn)階段,空間結(jié)構(gòu)越來越多地應(yīng)用于大型體育場館、會展中心、機(jī)場機(jī)庫、大型娛樂場所等公共建筑,并且跨度不斷增大,結(jié)構(gòu)形式也不斷創(chuàng)新。而空間網(wǎng)殼結(jié)構(gòu)更是以其獨(dú)特的結(jié)構(gòu)優(yōu)勢及良好的視覺效果受到人們的青睞。網(wǎng)殼結(jié)構(gòu)作為空間網(wǎng)格結(jié)構(gòu)的一種,其外表面是曲面的,所以其既具有薄殼結(jié)構(gòu)的受力合理的特點(diǎn),又具有桿系結(jié)構(gòu)構(gòu)造簡單、制作方便的特點(diǎn),同時(shí)還能形成天然的排水面。由于網(wǎng)殼結(jié)構(gòu)承受的的大部分荷載都通過其桿件的軸向力傳遞,加上其類似“薄膜”作用的受力特征,所以網(wǎng)殼結(jié)構(gòu)也存在穩(wěn)定問題。現(xiàn)階段,網(wǎng)殼結(jié)構(gòu)的靜力穩(wěn)定研究已經(jīng)相對比較成熟,然而其動力穩(wěn)定方面的研究還不夠全面,再考慮到網(wǎng)殼結(jié)構(gòu)在日常使用中遭受的荷載很可能是非均勻的,所以本文就著重研究單層球面網(wǎng)殼非均勻荷載作用下的動力穩(wěn)定問題。為了研究單層球面網(wǎng)殼在均勻和非均勻荷載作用下的動力穩(wěn)定性,本文基于全過程非線性動力反應(yīng)時(shí)程分析方法,運(yùn)用實(shí)用的動力穩(wěn)定性判定準(zhǔn)則,以聯(lián)方型單層球面網(wǎng)殼結(jié)構(gòu)為研究對象,采用有限元分析軟件ANSYS進(jìn)行模型建立,考慮滿跨均布荷載、滿跨不對稱荷載和半跨不對稱荷載三種荷載工況,以不同地震波(EL-Centro波、Taft波、天津波)、不同地震輸入維數(shù)(水平、豎向、三向)、矢跨比、桿件截面面積和初始幾何缺陷為參數(shù),系統(tǒng)分析了其在地震作用下的動力穩(wěn)定性,得出了一些有意義的結(jié)論,為網(wǎng)殼結(jié)構(gòu)的實(shí)際工程設(shè)計(jì)提供參考。
[Abstract]:Over the past decades, with the continuous improvement of people's living standards, the rapid development of society and the innovation and progress of science and technology, the space structure has also been developed more rapidly and applied more widely. Spatial structures are increasingly used in public buildings such as large stadiums, convention and exhibition centers, airport hangars, large entertainment places and so on. The space reticulated shell structure is favored by people because of its unique structural advantages and good visual effect. As a kind of spatial grid structure, the outer surface of the reticulated shell structure is curved. Therefore, it not only has the characteristics of reasonable force of thin shell structure, but also has the characteristics of simple structure of bar system structure and convenient manufacture. At the same time, it can also form a natural drainage surface. Since most of the loads borne by the latticed shell structure are transmitted through the axial force of its members, and the mechanical characteristics of the latticed shell structure are similar to the "membrane" action, there is also a problem of stability of the latticed shell structure at this stage. The study on static stability of latticed shell structures is relatively mature, but the study on dynamic stability of latticed shell structures is not comprehensive enough, and considering that the loads on latticed shell structures in daily use are likely to be non-uniform. In order to study the dynamic stability of single-layer spherical latticed shells under uniform and non-uniform loads, the dynamic stability of single-layer spherical latticed shells is studied in this paper. In this paper, based on the time-history analysis method of nonlinear dynamic response of the whole process, using the practical criterion of dynamic stability, taking the single-layer spherical latticed shell with square shape as the research object, the finite element analysis software ANSYS is used to build the model. Considering three load conditions: full span uniform load, full span asymmetric load and half span asymmetric load, different seismic waves such as EL-Centro wave and Taft wave, Tianjin wave, different earthquake input dimensions (horizontal, vertical, triaxial, rise-span ratio) are considered. The dynamic stability of bars subjected to earthquake is systematically analyzed and some meaningful conclusions are obtained which can provide a reference for the practical engineering design of latticed shell structures.
【學(xué)位授予單位】：長安大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TU399

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本文編號：1496989