超高层建筑临时支撑结构风压及风致反应的研究

发布时间：2018-01-28 01:41

本文关键词： 超高层建筑临时支撑结构塔吊施工电梯表面风压区域风场数值模拟风致反应　出处：《北京交通大学》2017年硕士论文　论文类型：学位论文

【摘要】：本论文研究内容是国家重点研发计划课题(课题编号:2016YFC0802003)—“临时支撑结构失稳机理及稳定性控制技术研究”的一部分,所属项目为“超高层建筑工程施工安全关键技术研究与示范”。我国是一个风灾频繁的国家,风灾每年都要造成极大的经济损失。随着超高层建筑的大量兴建,塔吊和施工电梯等重型机械的临时支撑结构出现坍塌、倾覆等现象众多。对近年来重型机械临时支撑频繁发生破坏的现象进行调查,发现一些事故是由于临时支撑受到较大风荷载的作用而发生的。由于现实中气候条件的随机性、多变性,导致结构设计过程中所采用的风荷载与实际情况往往有极大的不符合,这些都成为了意外事故产生的不确定因素。因此,本文根据计算流体力学的原理和方法,对超高层临时支撑结构表面风压及区域风场进行数值模拟与分析,并对不同工况下的临时支撑结构进行风致反应的分析。本文主要研究内容如下:(1)利用实测模型对数值模拟进行验证。进行标准6m立方体实测模型的数值模拟,将数值模拟结果、现场实测数据、风洞试验结果进行对比分析,验证数值模拟的准确性。(2)按照相关规范要求建立临时支撑结构的计算模型。考虑计算域的尺寸、网格划分方式,计算边界条件、方程离散格式、湍流模型的选取,结果敛散性等因素建立塔吊和施工电梯临时支撑结构的计算模型。(3)对塔吊和施工电梯的临时支撑结构进行风场数值模拟与分析。对塔吊和施工电梯区域风场进行不同工况的数值模拟,并分析不同工况下临时支撑结构表面的风压和区域风场的变化。不同工况的设置:①不同建筑高度;②不同风速;③不同风攻角。(4)利用(3)计算分析结果,对塔吊和施工电梯的临时支撑结构进行结构风致反应的分析。对不同工况下临时支撑结构的风致反应进行计算,对临时支撑结构的强度进行验算,确定临时支撑结构在风荷载作用下的薄弱部分。(5)结论与展望,提出需要进一步开展的研究工作,为后续研究奠定基础。
[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.
【学位授予单位】：北京交通大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TU731.2;TU973.213

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