本文關(guān)鍵詞： 超高層建筑 臨時(shí)支撐結(jié)構(gòu) 塔吊 施工電梯 表面風(fēng)壓 區(qū)域風(fēng)場(chǎng) 數(shù)值模擬 風(fēng)致反應(yīng)　出處：《北京交通大學(xué)》2017年碩士論文　論文類(lèi)型：學(xué)位論文

【摘要】：本論文研究?jī)?nèi)容是國(guó)家重點(diǎn)研發(fā)計(jì)劃課題(課題編號(hào):2016YFC0802003)—“臨時(shí)支撐結(jié)構(gòu)失穩(wěn)機(jī)理及穩(wěn)定性控制技術(shù)研究”的一部分,所屬項(xiàng)目為“超高層建筑工程施工安全關(guān)鍵技術(shù)研究與示范”。我國(guó)是一個(gè)風(fēng)災(zāi)頻繁的國(guó)家,風(fēng)災(zāi)每年都要造成極大的經(jīng)濟(jì)損失。隨著超高層建筑的大量興建,塔吊和施工電梯等重型機(jī)械的臨時(shí)支撐結(jié)構(gòu)出現(xiàn)坍塌、傾覆等現(xiàn)象眾多。對(duì)近年來(lái)重型機(jī)械臨時(shí)支撐頻繁發(fā)生破壞的現(xiàn)象進(jìn)行調(diào)查,發(fā)現(xiàn)一些事故是由于臨時(shí)支撐受到較大風(fēng)荷載的作用而發(fā)生的。由于現(xiàn)實(shí)中氣候條件的隨機(jī)性、多變性,導(dǎo)致結(jié)構(gòu)設(shè)計(jì)過(guò)程中所采用的風(fēng)荷載與實(shí)際情況往往有極大的不符合,這些都成為了意外事故產(chǎn)生的不確定因素。因此,本文根據(jù)計(jì)算流體力學(xué)的原理和方法,對(duì)超高層臨時(shí)支撐結(jié)構(gòu)表面風(fēng)壓及區(qū)域風(fēng)場(chǎng)進(jìn)行數(shù)值模擬與分析,并對(duì)不同工況下的臨時(shí)支撐結(jié)構(gòu)進(jìn)行風(fēng)致反應(yīng)的分析。本文主要研究?jī)?nèi)容如下:(1)利用實(shí)測(cè)模型對(duì)數(shù)值模擬進(jìn)行驗(yàn)證。進(jìn)行標(biāo)準(zhǔn)6m立方體實(shí)測(cè)模型的數(shù)值模擬,將數(shù)值模擬結(jié)果、現(xiàn)場(chǎng)實(shí)測(cè)數(shù)據(jù)、風(fēng)洞試驗(yàn)結(jié)果進(jìn)行對(duì)比分析,驗(yàn)證數(shù)值模擬的準(zhǔn)確性。(2)按照相關(guān)規(guī)范要求建立臨時(shí)支撐結(jié)構(gòu)的計(jì)算模型�？紤]計(jì)算域的尺寸、網(wǎng)格劃分方式,計(jì)算邊界條件、方程離散格式、湍流模型的選取,結(jié)果斂散性等因素建立塔吊和施工電梯臨時(shí)支撐結(jié)構(gòu)的計(jì)算模型。(3)對(duì)塔吊和施工電梯的臨時(shí)支撐結(jié)構(gòu)進(jìn)行風(fēng)場(chǎng)數(shù)值模擬與分析。對(duì)塔吊和施工電梯區(qū)域風(fēng)場(chǎng)進(jìn)行不同工況的數(shù)值模擬,并分析不同工況下臨時(shí)支撐結(jié)構(gòu)表面的風(fēng)壓和區(qū)域風(fēng)場(chǎng)的變化。不同工況的設(shè)置:①不同建筑高度;②不同風(fēng)速;③不同風(fēng)攻角。(4)利用(3)計(jì)算分析結(jié)果,對(duì)塔吊和施工電梯的臨時(shí)支撐結(jié)構(gòu)進(jìn)行結(jié)構(gòu)風(fēng)致反應(yīng)的分析。對(duì)不同工況下臨時(shí)支撐結(jié)構(gòu)的風(fēng)致反應(yīng)進(jìn)行計(jì)算,對(duì)臨時(shí)支撐結(jié)構(gòu)的強(qiáng)度進(jìn)行驗(yàn)算,確定臨時(shí)支撐結(jié)構(gòu)在風(fēng)荷載作用下的薄弱部分。(5)結(jié)論與展望,提出需要進(jìn)一步開(kāi)展的研究工作,為后續(xù)研究奠定基礎(chǔ)。
[Abstract]:The research content of this paper is a part of the national key R & D project (subject No. W 2016YFC0802003- "study on the instability Mechanism and Stability Control Technology of temporary support structure"). Our project is "Research and demonstration of key Technologies in Construction Safety of Super High-rise Building". China is a country with frequent wind disasters, which cause great economic losses every year. With the construction of a large number of super-high-rise buildings. The temporary supporting structures of heavy machinery such as tower cranes and construction elevators are collapsed and overturned. The phenomenon of frequent damage to temporary support of heavy machinery is investigated in recent years. It is found that some accidents occur due to the strong wind load on temporary braces and the randomness and variability of climate conditions in reality. As a result, the wind load used in the structural design process is often not in accordance with the actual situation, which has become an uncertain factor of accidents. Therefore, according to the principles and methods of computational fluid dynamics, this paper is based on the theory and method of computational fluid dynamics (CFD). Numerical simulation and analysis of surface wind pressure and regional wind field of super high-rise temporary support structure are carried out. The wind-induced response of temporary bracing structures under different working conditions is analyzed. The main contents of this paper are as follows: 1). The numerical simulation is verified by the measured model, and the numerical simulation of the standard 6m cube model is carried out. The numerical simulation results, field measured data and wind tunnel test results are compared and analyzed. Verify the accuracy of the numerical simulation. (2) establish the calculation model of temporary support structure according to the requirements of relevant specifications. Consider the size of the calculation domain, the way of mesh division, the calculation of boundary conditions, the equation discretization scheme. The selection of turbulence model. Results the calculation model of temporary supporting structure of tower crane and construction elevator was established by factors such as convergence and divergence. The wind field numerical simulation and analysis of temporary supporting structure of tower crane and construction elevator are carried out, and the numerical simulation of wind field in tower crane and construction elevator area is carried out. The variation of wind pressure and regional wind field on the surface of temporary support structure under different working conditions is analyzed. (2) different wind speed; (3) different angles of attack. The wind-induced response of temporary supporting structure of tower crane and construction elevator is analyzed. The wind-induced response of temporary supporting structure under different working conditions is calculated and the strength of temporary supporting structure is checked. The conclusion and prospect of the weak part of temporary bracing structure under wind load are determined, and the further research work is put forward to lay a foundation for further research.
【學(xué)位授予單位】：北京交通大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類(lèi)號(hào)】：TU731.2;TU973.213

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