發(fā)布時(shí)間：2018-12-27 11:21

【摘要】：隨著高層建筑的普及,高層建筑風(fēng)工程的研究日臻成熟,高層建筑的高度不斷翻新,人類在文明史上不斷創(chuàng)造新的奇跡。高層建筑對風(fēng)荷載的敏感性,使得風(fēng)載成為高層設(shè)計(jì)中不容忽視的主要荷載之一。高層結(jié)構(gòu)風(fēng)致響應(yīng)分析是近年來高層建筑研究的小熱點(diǎn),其工程意義不言而喻。但是目前針對高層的風(fēng)致響應(yīng)分析中,大多學(xué)者只是針對性的研究上部結(jié)構(gòu)的抗風(fēng)問題,忽略了高層建筑基礎(chǔ)對上部結(jié)構(gòu)的影響。目前高層建筑大多有龐大的箱型基礎(chǔ),在進(jìn)行高層建筑風(fēng)效應(yīng)分析時(shí),忽略底部的基礎(chǔ)會對整體結(jié)構(gòu)的研究結(jié)果產(chǎn)生不容忽視影響。本文以流固耦合的方式對高層建筑的風(fēng)效應(yīng)進(jìn)行分析,本文流場采用大渦模擬模型來進(jìn)行模擬,并對流場模型施加脈動風(fēng)速。在第二章中,針對大渦模擬三種不同的亞格子模型進(jìn)行了 CFD分析,對比選擇合適的亞格子模型,經(jīng)過CAARC剛性模型的常態(tài)風(fēng)模擬之后,選擇動力亞格子模型作為后文的分析模型。而后第三章以CAARC模型為基礎(chǔ),建立四種不同的結(jié)構(gòu)模型,分別為:不考慮基礎(chǔ)的結(jié)構(gòu)模型、基礎(chǔ)平面面積為上部結(jié)構(gòu)1倍、2.25倍和4倍的模型,并對每種模型在脈動風(fēng)下的位移響應(yīng)、加速度響應(yīng)、內(nèi)力響應(yīng)及結(jié)構(gòu)表面風(fēng)壓進(jìn)行了對比分析。分析得出在高層進(jìn)行承載力分析時(shí),不考慮基礎(chǔ)與結(jié)構(gòu)的相互作用對結(jié)構(gòu)計(jì)算的結(jié)果是有利的,但對于高層結(jié)構(gòu)的位移控制和舒適度控制方面,不考慮基礎(chǔ)的作用對于控制結(jié)果是不利的。為了使得高層建筑更加適宜于人類生活的需要以及節(jié)約建筑材料,本文建議在高層結(jié)構(gòu)進(jìn)行設(shè)計(jì)時(shí)將基礎(chǔ)考慮到結(jié)構(gòu)模型中,以整體模型為基礎(chǔ)進(jìn)行設(shè)計(jì),再針對上部結(jié)構(gòu)進(jìn)行承載力檢驗(yàn)。本文第五章以某一高層實(shí)例為研究對象,分析了其在脈動風(fēng)下的響應(yīng),發(fā)現(xiàn)對于不同的結(jié)構(gòu)體系,基礎(chǔ)的影響程度不同。但總體而言,在進(jìn)行高層建筑風(fēng)效應(yīng)分析時(shí)建議考慮基礎(chǔ)結(jié)構(gòu)的整體性。高層建筑對風(fēng)的敏感性不容忽視,高層建筑基礎(chǔ)與上部結(jié)構(gòu)的相互作用也會對其風(fēng)效應(yīng)產(chǎn)生不容忽視的影響,本文將不同的模型進(jìn)行了對比,為工程設(shè)計(jì)提出設(shè)計(jì)時(shí)考慮基礎(chǔ)-結(jié)構(gòu)的整體性的建議,以使得高層不僅滿足承載力要求還保證有足夠的舒適度。
[Abstract]:With the popularization of high-rise buildings, the study of high-rise building wind engineering is maturing day by day, the height of high-rise building is constantly renovated, and human beings create new miracles in the history of civilization. The sensitivity of tall buildings to wind load makes wind load one of the main loads that can not be ignored in high-rise design. Wind-induced response analysis of high-rise structures is a small hot spot in recent years, and its engineering significance is self-evident. However, in the analysis of wind-induced response of high-rise buildings, most scholars only study the wind-resistant problem of superstructure and ignore the influence of high-rise building foundation on superstructure. At present, most high-rise buildings have large box foundations. When analyzing the wind effect of high-rise buildings, neglecting the foundation at the bottom can not be ignored to the research results of the whole structure. In this paper, the wind effect of high-rise building is analyzed by fluid-solid coupling. In this paper, the large eddy simulation model is used to simulate the flow field, and the flow field model is applied to apply pulsating wind speed. In the second chapter, the CFD analysis of three different sublattice models of large eddy simulation is carried out, and the appropriate sub-lattice model is compared. After the normal wind simulation of the CAARC rigid model, the dynamic sub-lattice model is chosen as the later analysis model. In the third chapter, based on CAARC model, four different structural models are established, which are: the structural model without considering foundation, the model with a plane area of 1, 2. 25 and 4 times of that of the superstructure, respectively, in which the plane area of the foundation is 1 times, 2. 25 times and 4 times of that of the superstructure. The displacement response, acceleration response, internal force response and surface wind pressure of each model under pulsating wind are compared and analyzed. When carrying out carrying capacity analysis of high-rise building, it is beneficial to the result of structure calculation without considering the interaction between foundation and structure, but it is beneficial to the displacement control and comfort control of high-rise structure. It is disadvantageous to control the result without considering the function of foundation. In order to make the high-rise building more suitable to the needs of human life and to save building materials, this paper suggests that the foundation should be taken into account in the design of the high-rise structure, and the design should be based on the integral model. Then the bearing capacity of the superstructure is tested. In the fifth chapter, we take a high level example as the research object, analyze its response under the pulsating wind, and find that the influence degree of foundation is different for different structure system. But overall, it is suggested that the integrity of infrastructure should be considered in the analysis of wind effect of high-rise buildings. The sensitivity of high-rise building to wind can not be ignored, and the interaction between foundation and superstructure of high-rise building will also have an important influence on wind effect. The different models are compared in this paper. In order to make the high-rise meet not only the requirement of bearing capacity but also the sufficient comfort, it is suggested that the integrality of foundation and structure should be taken into account in the design of engineering design.
【學(xué)位授予單位】：山東大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TU973.32

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