本文關(guān)鍵詞：大型復(fù)雜建筑結(jié)構(gòu)風(fēng)致效應(yīng)及等效靜力風(fēng)荷載研究　出處：《浙江大學(xué)》2013年博士論文　論文類(lèi)型：學(xué)位論文

  更多相關(guān)文章： 超高層建筑 大型屋蓋結(jié)構(gòu) 三維風(fēng)荷載 風(fēng)致響應(yīng) 多目標(biāo)等效靜力風(fēng)荷載 POD法 模態(tài)選擇

【摘要】：以超高層及大跨屋蓋為代表的大型復(fù)雜建筑結(jié)構(gòu)由于質(zhì)量輕、柔性大、阻尼小等特點(diǎn)使得風(fēng)荷載往往成為設(shè)計(jì)控制荷載。對(duì)此類(lèi)風(fēng)敏感結(jié)構(gòu)風(fēng)致響應(yīng)及等效靜力風(fēng)荷載的精細(xì)化研究對(duì)解決實(shí)際設(shè)計(jì)問(wèn)題具有重要意義。為此,本文以多個(gè)具有代表性的剛性模型測(cè)壓風(fēng)洞試驗(yàn)結(jié)果為基礎(chǔ),以復(fù)雜體型超高層建筑及大型屋蓋結(jié)構(gòu)為主要研究對(duì)象,開(kāi)展了以下幾個(gè)方面的工作： 1.研究了單體及群體超高層建筑結(jié)構(gòu)三維風(fēng)荷載效應(yīng)。其中在復(fù)雜體型單體建筑三維風(fēng)荷載效應(yīng)方面,引入了扭轉(zhuǎn)向等效力偶的概念用以比較扭轉(zhuǎn)向風(fēng)荷載與水平分量間的大小關(guān)系,明確了此類(lèi)建筑風(fēng)荷載扭轉(zhuǎn)效應(yīng)的重要性；擬合了不規(guī)則截面建筑在典型風(fēng)向角下的層扭矩規(guī)格化功率譜曲線,發(fā)現(xiàn)其受截面厚寬比等參數(shù)的影響明顯。在群體建筑干擾效應(yīng)方面,以一窄長(zhǎng)形直線狀建筑群為研究對(duì)象,著重考察了在典型正交風(fēng)向角下受擾建筑表面各測(cè)點(diǎn)風(fēng)壓及層三維風(fēng)荷載的量值分布和變化情況,發(fā)現(xiàn)群體建筑間的干擾作用主要表現(xiàn)為狹縫效應(yīng)和遮擋效應(yīng)。 2.考察了三維時(shí)變風(fēng)荷載作用下具有非規(guī)則體型超高層建筑結(jié)構(gòu)風(fēng)致響應(yīng)的計(jì)算方法及影響因素。引入對(duì)數(shù)坐標(biāo)體系下廣義荷載譜隨頻率分布的線性假定,提出了新的廣義位移響應(yīng)共振分量簡(jiǎn)化計(jì)算公式,證明了其相比傳統(tǒng)的白噪聲假定具有更高的精確性；考察了建筑外型的復(fù)雜性及高階振型的參與等因素對(duì)結(jié)構(gòu)不同位置各類(lèi)風(fēng)致響應(yīng)的影響。 3.在建立現(xiàn)有單目標(biāo)等效靜力風(fēng)荷載作用下結(jié)構(gòu)不同位置等效響應(yīng)與實(shí)際結(jié)果間相互關(guān)系的基礎(chǔ)上,提出了可以保證目標(biāo)位置三維多目標(biāo)響應(yīng)等效的靜力風(fēng)荷載計(jì)算方法,并進(jìn)一步綜合考慮了峰值因子的非高斯特性及多目標(biāo)等效折減效應(yīng)的影響,使得相應(yīng)的等效靜力風(fēng)荷載計(jì)算結(jié)果更為合理可靠。 4.根據(jù)POD法基本原理對(duì)傳統(tǒng)大跨屋蓋結(jié)構(gòu)風(fēng)致響應(yīng)的頻域算法加以優(yōu)化,提出了先挑選控制模態(tài)再進(jìn)行精確風(fēng)致響應(yīng)計(jì)算的“二步法”過(guò)程。工程算例表明該計(jì)算過(guò)程不僅具有提取信息簡(jiǎn)單、精度高、收斂快等特點(diǎn),還有利于從原理上了解風(fēng)激勵(lì)對(duì)大跨屋蓋結(jié)構(gòu)風(fēng)致響應(yīng)的影響過(guò)程。 5.針對(duì)現(xiàn)有屋蓋結(jié)構(gòu)等效靜力風(fēng)荷載受不同節(jié)點(diǎn)間的風(fēng)致響應(yīng)相關(guān)性影響、分布形式極不均勻的特點(diǎn),提出了針對(duì)屋蓋結(jié)構(gòu)的多目標(biāo)等效靜力風(fēng)荷載計(jì)算方法。該方法不僅考慮了各目標(biāo)響應(yīng)脈動(dòng)極值的符號(hào)選取問(wèn)題,且靜力風(fēng)荷載量值分布不再受單一節(jié)點(diǎn)或局部區(qū)域的控制,更趨于均勻、合理。在該組等效靜力風(fēng)荷載作用下,不僅能夠保證關(guān)鍵部位等效響應(yīng)與實(shí)際結(jié)果高度一致,其它非關(guān)鍵部位響應(yīng)結(jié)果也具有一定的精確性和連續(xù)性。
[Abstract]:Large and complex structures in high-rise and large span roof represented as light weight, large flexibility, small damping characteristics of the wind load becomes design control load. Research on refinement of wind-induced response and equivalent static wind load of the wind sensitive structure has important significance to solve the problem with the actual gauge. Therefore, the rigidity model manometric based on the wind tunnel test results of a representative based on complex shape high-rise buildings and large roof structure as the main object of study, carried out the following work:
1. of the monomer and three groups of high-rise building structure. The effect of wind load in the complicated shape of single building three-dimensional wind load effect, the concept of equivalent torsional moments to compare the size of wind load and horizontal torsion relationship between components, clear the importance of the construction of wind load torsion effect; fitting the irregular section construction in typical wind direction of the layer torque specification spectrum curve, the influence of thickness to width ratio of section parameters obviously. In group building interference effect, with a narrow and long linear buildings as the research object, focuses on the study in the typical orthogonal wind angle interfered building surface the measured wind pressure and wind load values of the three-dimensional distribution and changes, found the interference effect of group building mainly for the effect of slit effect and occlusion.
2. the effects of the factors with irregular response computation method of tall building structure and wind-induced effects of three-dimensional time varying wind load. Based on the logarithmic coordinate system of generalized linear load spectrum with frequency distribution, put forward the new generalized displacement response of the resonant component simplified calculation formula, proved its compared to the traditional assumption of white noise with more accuracy; the effects of complex architectural appearance and high modes of participation and other factors on the wind-induced response of structures of different position of various.
The relationship between the 3. basic structure in the establishment of the existing single equivalent static wind loads of different position equivalent response and the actual results, proposed can ensure the target location of three-dimensional multi-target response equivalent static wind load calculation method, and further considering the influence of the equivalent non Gauss characteristic peak value factor and multi objective reduction the effect of the calculation results, the corresponding equivalent static wind load is more reasonable and reliable.
4. according to the basic principle of POD algorithm in frequency domain for the traditional method of large span roof structures of wind-induced response optimization, put forward first pick control mode and then accurately calculate the wind-induced response of the "two step" process. The engineering examples show that the calculation process is not only simple information extraction, high precision, fast convergence characteristics, but also conducive to the understanding of wind the incentive effect on the wind-induced response of long-span roof from the principle.
5. for equivalent static wind loads by the existing roof structure influence the wind-induced response of different nodes, the characteristics of distribution is extremely uneven, is proposed for the calculation of the equivalent static wind load multi-objective roof structure method. This method not only takes into account the target response pulsation extremely the sign of the value selection problem, and the static wind load value the distribution is no longer controlled by a single node or the local area, more uniform, reasonable. In the group of equivalent static wind load, can not only ensure the key parts of the equivalent response is highly consistent with the actual results, other non key parts of response result is also accurate and continuous.

【學(xué)位授予單位】：浙江大學(xué)
【學(xué)位級(jí)別】：博士
【學(xué)位授予年份】：2013
【分類(lèi)號(hào)】：TU312.1

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