附着状态超高层建筑施工电梯震害分析

发布时间：2018-11-12 18:46

【摘要】：在施工阶段,施工机具易受到自然灾害或人为因素影响而破坏,威胁施工人员的安全。而施工电梯作为常见的施工机具,由于其自身特点,对地震作用极其敏感。鲁甸地震对昆明市西山区万达双塔施工系统,包括施工电梯在内,造成一定程度影响。若震级超过鲁甸地震,或主体结构进行更大高度施工,施工电梯极有可能受地震影响发生破坏,甚至发生施工事故。因此,需要在地震作用下,对附着状态的超高层施工电梯进行详细研究。本文以鲁甸地震作为研究背景,利用SAP2000有限元软件分析昆明西山万达双塔施工电梯地震响应特点,并选择采用施工电梯“小震不停、中大震不塌”的抗震设防目标,与主体结构设防目标相匹配。取得以下主要成果:(1)根据电梯不同工作情况建立附着状态有限元模型,由Ritz向量模态分析方法得出附着状态电梯主要振型特征是以低阶弯曲变形和扭转变形为主,为后续地震作用下附着状态施工电梯动力特性的研究提供依据;(2)由弹性时程分析方法计算多遇地震下电梯杆件内力状态并进行强度校核,得出荷载、吊笼高度、地震作用方向等因素均对杆件内力产生影响,验证杆件强度满足要求,且满足“小震不停”的设防目标,为多遇地震下电梯杆件损伤演化规律的探索奠定基础;(3)由弹塑性时程分析方法计算设防地震、罕遇地震下电梯结构整体的变形程度,得出电梯不同高度、不同部分杆件有不同塑性铰状态,表明电梯高度、吊笼高度对结构整体影响较大,证明电梯已经处于危险或坍塌状态,不满足“中大震不塌”的设防目标,为强震作用下电梯整体坍塌灾变机理的分析给出参考。
[Abstract]:In the construction stage, construction tools are easily damaged by natural disasters or human factors, threatening the safety of construction personnel. As a common construction tool, the construction elevator is very sensitive to earthquake because of its own characteristics. The Ludian earthquake affected the construction system of Wanda twin towers, including construction elevators, in Xishan District of Kunming to a certain extent. If the magnitude of the earthquake exceeds the Ludian earthquake, or the construction of the main structure is carried out at a higher height, it is very likely that the construction elevator will be damaged by the earthquake, and even the construction accident will occur. Therefore, it is necessary to study the attached super-high-rise construction elevator in detail under earthquake action. Taking the Ludian earthquake as the research background, this paper uses SAP2000 finite element software to analyze the seismic response characteristics of the construction elevator of Wanda double tower in Xishan, Kunming, and chooses the seismic fortification target of the construction elevator, which is "small earthquake does not stop, medium large earthquake does not collapse". Matches the main structure fortification target. The main achievements are as follows: (1) according to the different working conditions of the elevator, the finite element model of the attachment state is established, and the main modal characteristics of the attached elevator are obtained by using the Ritz vector modal analysis method. The main characteristics of the vibration mode of the attached elevator are the low-order bending deformation and the torsional deformation. It provides the basis for the study of the dynamic characteristics of the elevator in the construction of the attached state under the subsequent earthquake. (2) based on the elastic time history analysis method, the internal force state of elevator rod under frequent earthquakes is calculated and the strength is checked. The results show that the load, the height of the hoist and the direction of seismic action all affect the internal force of the rod, and verify that the strength of the rod meets the requirements. It also satisfies the fortification target of "small earthquakes", and lays a foundation for the exploration of the rules of damage evolution of elevator rod under frequent earthquakes. (3) based on the elastoplastic time history analysis method, the deformation degree of the elevator structure is calculated under earthquake fortification and rare earthquake, and the different elevators have different plastic hinge states in different parts of the bar, which indicates the elevator height. The height of the hoisting cage has a great influence on the whole structure, which proves that the elevator has been in a dangerous or collapsing state and does not meet the fortification target of "medium and large earthquake does not collapse". It provides a reference for the analysis of the collapse catastrophe mechanism of the elevator under the action of strong earthquake.
【学位授予单位】：昆明理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TU976.3

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