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  本文選題：大跨度屋蓋結(jié)構(gòu) + 球面網(wǎng)殼��； 參考：《哈爾濱工業(yè)大學(xué)》2015年碩士論文

【摘要】：現(xiàn)代結(jié)構(gòu)正在向大跨、輕質(zhì)以及低阻尼方向發(fā)展,結(jié)構(gòu)的風(fēng)敏感性日益突出。目前,高層、高聳和橋梁結(jié)構(gòu)的抗風(fēng)設(shè)計理論框架基本形成;而大跨度屋蓋結(jié)構(gòu)由于具有多荷載形態(tài)、多響應(yīng)振型和多等效目標(biāo)的特點,抗風(fēng)設(shè)計理論尚不成熟。采用高層、高聳結(jié)構(gòu)的設(shè)計方法進行大跨屋蓋結(jié)構(gòu)的抗風(fēng)設(shè)計不能滿足安全性及經(jīng)濟性的要求。本文以風(fēng)敏感度概念為基礎(chǔ),對風(fēng)敏感度理論進行改進,以此研究球面網(wǎng)殼結(jié)構(gòu)的風(fēng)敏感性;通過風(fēng)敏感度對球面網(wǎng)殼結(jié)構(gòu)進行抗風(fēng)設(shè)計分級,并提出相應(yīng)的等效靜風(fēng)荷載方法;并采用此方法對超大跨穹頂結(jié)構(gòu)進行了抗風(fēng)性能分析。本文主要工作如下:(1)闡述風(fēng)敏感度理論的分析方法,并對相關(guān)內(nèi)容進行了改進。在風(fēng)敏感度理論中,球面網(wǎng)殼結(jié)構(gòu)為多模態(tài)耦合結(jié)構(gòu),通過定義共振效應(yīng)系數(shù)可以綜合考慮頻率效應(yīng)和模態(tài)效應(yīng)。(2)通過對不同結(jié)構(gòu)參數(shù)的單層及雙層球面網(wǎng)殼進行風(fēng)敏感性分析,比較結(jié)構(gòu)的風(fēng)敏感度,可以得到影響結(jié)構(gòu)風(fēng)敏感度的主要因素,并給出相應(yīng)關(guān)系表達式。不同單層球面網(wǎng)殼結(jié)構(gòu)風(fēng)敏感度差異較大,根據(jù)矢跨比將單層球面網(wǎng)殼結(jié)構(gòu)按風(fēng)敏感度分級。矢跨比較小的單層球面網(wǎng)殼為高風(fēng)敏感結(jié)構(gòu);矢跨比較大的單層球面網(wǎng)殼為低風(fēng)敏感結(jié)構(gòu);雙層球殼為低風(fēng)敏感結(jié)構(gòu)。(3)整體風(fēng)振系數(shù)法采用平均風(fēng)荷載為基向量對極值風(fēng)響應(yīng)進行擬合,進而得到結(jié)構(gòu)等效靜風(fēng)荷載,對應(yīng)系數(shù)為整體風(fēng)振系數(shù)。采用整體風(fēng)振系數(shù)法得出了單層球面網(wǎng)殼位移整體風(fēng)振系數(shù)和應(yīng)力整體風(fēng)振系數(shù)與結(jié)構(gòu)風(fēng)敏感度參數(shù)的擬合公式,通過統(tǒng)計分析得出適合工程應(yīng)用的球面網(wǎng)殼的整體風(fēng)振系數(shù)表及其適用范圍。(4)通過彈性時程分析,比較風(fēng)荷載下三種跨度的超大跨穹頂結(jié)構(gòu)的自振特性、節(jié)點位移、桿件內(nèi)力,支座反力,超大跨球殼的脈動風(fēng)響應(yīng)和平均風(fēng)響應(yīng),得出脈動響應(yīng)可以忽略,大跨度球面網(wǎng)殼的結(jié)構(gòu)風(fēng)敏感度較小,為低風(fēng)敏感結(jié)構(gòu)。
[Abstract]:The modern structure is large span, light and low damping direction, wind sensitive structure becomes more obvious. At present, the top, the wind resistant design theory and high bridge structure formation; and large span roof structures with multiple load form, multi type and multi vibration response characteristics of equivalent target, wind resistant design theory is still not mature. The design method of high-rise, high-rise structure are not large span roof wind resistance design to meet the safety and economy requirements. Based on the concept of sensitivity to wind, wind sensitivity theory is improved, the wind sensitivity in order to study the spherical reticulated shell structure; the wind through the sensitivity to the spherical reticulated shell structure of wind resistant the design of classification, and put forward the corresponding method of equivalent static wind load; and the use of this method for super long-span dome structure of wind resistance analysis. The main work of this paper is as follows: (1) this The analysis method of wind sensitivity theory, and related content has been improved. In the wind sensitivity theory, spherical reticulated shell structure multi modal coupling structure, can consider the frequency and modal effect by defining the resonance effect coefficient. (2) the wind through the sensitivity analysis of single layer with different structure parameters and the double-layer spherical reticulated shell and compare the structure of the wind sensitivity, can get the main factors affecting the structure of wind sensitivity, and the corresponding expressions. Different latticed shell structure wind sensitive degree differences, according to the ratio of rise to span single-layer spherical reticulated shell structure according to wind sensitivity classification. The span of single-layer spherical shell is relatively small for the high wind sensitive structure; span single-layer spherical reticulated shell relatively large low wind sensitive structure; double layered spherical shell for low wind sensitive structure. (3) the wind vibration coefficient method using average wind load based on extreme wind vector Should be fitting, then get the equivalent static wind load structure, the corresponding coefficient of wind vibration coefficient. The wind vibration coefficient of the overall method of fitting formula of overall wind vibration coefficient of single-layer spherical shell displacement and stress of the whole wind vibration coefficient and the structure of wind sensitive parameters, the overall wind vibration coefficient table through statistical analysis of spherical shell suitable for the engineering application and scope. (4) through the elastic time history analysis, super - span dome structure of three span self vibration characteristics, displacement under wind load, internal forces of rod, bearing force, fluctuating wind response and average wind response of super long-span spherical shell, the impulse response can be ignored the structure of the wind, smaller sensitivity of large-span latticed shell, low wind sensitive structure.

【學(xué)位授予單位】：哈爾濱工業(yè)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：1748362