【摘要】：隨著經(jīng)濟(jì)發(fā)展,城市化進(jìn)程的加快,越來越多的高層建筑涌現(xiàn),并且正朝著大長化和輕柔化的趨勢發(fā)展,而在結(jié)構(gòu)設(shè)計中被我們忽視的風(fēng)荷載作用給高層建筑帶來的問題變得尤為突出,甚至有時風(fēng)荷載在復(fù)雜的荷載效應(yīng)組合中起決定性作用。風(fēng)荷載具有的隨機(jī)特征和動力特征決定了其引起的結(jié)構(gòu)響應(yīng)異常復(fù)雜,在結(jié)構(gòu)設(shè)計中單純的簡化計算難以反映實(shí)際工程真正的受風(fēng)狀態(tài)。因此,為了滿足建筑物安全性、適用性、舒適性的要求,深化抗風(fēng)設(shè)計理念,開展對風(fēng)荷載作用下建筑結(jié)構(gòu)動力響應(yīng)的研究工作具有重要的意義。本文通過模擬空間風(fēng)場,結(jié)合工程實(shí)例,對剪力墻結(jié)構(gòu)與框架-核心筒結(jié)構(gòu)進(jìn)行了風(fēng)振響應(yīng)分析,主要研究內(nèi)容如下:(1)分析了風(fēng)荷載作用下的剪力墻結(jié)構(gòu)與框架核心筒結(jié)構(gòu)簡化模型的變形特點(diǎn),結(jié)合工程實(shí)例建立了有限元模型,并施加了動力風(fēng)荷載進(jìn)行分析。通過得到的位移響應(yīng)驗(yàn)證了理論分析的正確性。(2)結(jié)合工程所在地基本風(fēng)壓統(tǒng)計數(shù)據(jù),采用線性濾波法實(shí)現(xiàn)了對現(xiàn)實(shí)狀態(tài)中脈動風(fēng)場的模擬,獲得了風(fēng)荷載時程曲線。通過對時間、頻率等參數(shù)的反復(fù)調(diào)整,使模擬結(jié)果達(dá)到了預(yù)期的精度要求。(3)基于平面尺寸、建筑立面、荷載工況等因素都相同的條件,對結(jié)構(gòu)選型為剪力墻結(jié)構(gòu)的建筑與選型為框架-核心筒結(jié)構(gòu)的建筑作了風(fēng)振動力響應(yīng)時域分析。從位移變化、速度變化、內(nèi)力變化等方面綜合分析認(rèn)為框架-核心筒結(jié)構(gòu)選型的建筑在動力風(fēng)荷載作用下更穩(wěn)定。(4)基于原框架-核心筒建筑模型,分別調(diào)整了框架與核心筒的抗側(cè)剛度,進(jìn)行了風(fēng)振響應(yīng)對比分析。研究表明在此類結(jié)構(gòu)中,框架部分剛度的增加會對控制側(cè)移有更大的作用,但過分強(qiáng)調(diào)增加剛度會引起風(fēng)振加速度與構(gòu)件應(yīng)力的增大,會降低舒適度,也增大了結(jié)構(gòu)破壞的風(fēng)險。(5)基于原剪力墻建筑模型,調(diào)整了剪力墻布置位置,進(jìn)行了風(fēng)振響應(yīng)對比分析。研究表明在此類結(jié)構(gòu)中剪力墻邊緣布置會提升結(jié)構(gòu)的整體剛度,對控制側(cè)移有利,但不利于控制風(fēng)振加速度和底部應(yīng)力。
[Abstract]:With the development of economy and the acceleration of urbanization, more and more high-rise buildings are emerging, and they are developing towards the trend of long and gentle. The wind load, which is neglected by us in structural design, has become particularly prominent, and sometimes wind load plays a decisive role in the complex combination of load effects. The random and dynamic characteristics of wind load determine that the structural response caused by wind load is extremely complex, so it is difficult to reflect the real wind state of actual engineering by simple simplified calculation in structural design. Therefore, in order to meet the requirements of building safety, applicability and comfort, it is of great significance to deepen the concept of wind-resistant design and to carry out the research on the dynamic response of building structures under wind load. In this paper, the wind-induced vibration response of shear wall structure and frame-core tube structure is analyzed by simulating the spatial wind field and combining with an engineering example. The main research contents are as follows: (1) the deformation characteristics of the simplified model of shear wall structure and frame core tube structure under wind load are analyzed, the finite element model is established with an engineering example, and the dynamic wind load is applied to analyze it. The correctness of the theoretical analysis is verified by the obtained displacement response. (2) combined with the basic wind pressure statistical data of the project location, the linear filtering method is used to simulate the fluctuating wind field in the real state, and the time history curve of wind load is obtained. Through the repeated adjustment of time, frequency and other parameters, the simulation results meet the expected accuracy requirements. (3) based on the same factors such as plane size, building facade, load condition and so on, the time domain analysis of wind-induced dynamic response of buildings with shear wall structure and frame-core tube structure is carried out. From the aspects of displacement change, velocity change, internal force change and so on, it is considered that the selected structure of frame-core tube structure is more stable under dynamic wind load. (4) based on the original frame-core tube building model, the lateral stiffness of frame and core tube is adjusted respectively, and the wind-induced vibration response is compared and analyzed. The results show that the increase of partial stiffness of the frame will have a greater effect on the control of lateral displacement, but overemphasis on the increase of stiffness will lead to the increase of wind-induced acceleration and member stress, which will reduce the comfort and increase the risk of structural failure. (5) based on the original shear wall building model, the arrangement position of shear wall is adjusted, and the wind-induced vibration response is compared and analyzed. The results show that the edge arrangement of shear wall in this kind of structure can improve the overall stiffness of the structure, which is beneficial to the control of lateral displacement, but not conducive to the control of wind-induced vibration acceleration and bottom stress.
【學(xué)位授予單位】：河北工程大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TU311.3

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