多点输入下考虑下部支承K8单层球面网壳强震响应研究

发布时间：2018-05-24 15:45

本文选题：单层球面网壳 + 下部支承结构　；参考：《哈尔滨工业大学》2014年硕士论文

【摘要】：大跨度结构以其多变的结构形式，，优美的形态和丰富的功能性吸引着世人的眼球。一大批技术先进、规模宏大、形式新颖的大空间公共建筑进入到人们的生活中，并且平面尺度逐渐增大，如日本名古屋穹顶，支承在看台框架柱顶的屋盖直径达到了187.2m。地震是结构服役期内可能承受的主要动力作用之一，由于行波效应、相干效应、场地效应和衰减效应的影响，在到达结构场地时会存在空间变化。对于大跨度、大尺度的网壳结构，地震的空间变化性效应可能比较显著，考虑空间变化的地震多点输入比一致输入更符合实际。本文正是在此背景下，对以下内容开展了研究：集成现有较优地震动模型模拟地震动场。模拟中选用曾庆龙提出的相干函数模型、Thrainsson and Kremidjian相位差谱模型和杜修力-陈厚群功率谱模型。利用三角级数合成法模拟空间相关非平稳地震动场，其中考虑了相干效应和行波效应的影响。建立无下部支承120m跨度K8单层球面网壳模型和有下部支承120m、90m跨度K8单层球面网壳模型。利用全荷载域时程动力分析方法对以上三个模型分别进行了一维多点、一维一致、多维多点和多维一致输入下的地震响应分析。研究表明，不考虑下部支承结构的影响，会夸大地震空间变化性对结构的影响，特别是网壳周边环杆。进行抗震设计时应考虑地震空间变化性对结构的影响。考察了下部支承结构刚度变化对上部网壳结构的影响。分别计算5组不同柱的抗侧刚度对120m跨度K8单层球面网壳在多维多点输入和多维一致输入下的地震响应。分析了下部支承结构刚度变化对网壳结构地震响应的影响。
[Abstract]:Long-span structure attracts the attention of the world with its changeable structure form, beautiful form and abundant function. A large number of large space public buildings with advanced technology, large scale and novel forms have entered into people's lives, and the plane scale has gradually increased. For example, the dome of Nagoya in Japan, the roof diameter of the roof supported on the roof of the grandstand frame column has reached 187.2 m. Earthquake is one of the main dynamic effects which may be borne during the structure service period. Due to the effects of traveling wave effect, coherence effect, site effect and attenuation effect, there will be spatial changes when arriving at the structure site. For large span and large scale latticed shell structures, the spatial variation effect of earthquakes may be significant, and the multi-point seismic input considering spatial variation is more practical than uniform input. In this paper, the following contents are studied: integrating the existing optimal ground motion models to simulate the ground motion field. The coherent function model proposed by Zeng Qinglong is used to simulate the phase difference spectrum model of Thrainsson and Kremidjian and the power spectrum model of du Shouli-Chen Houqun. A triangular series synthesis method is used to simulate the spatially correlated nonstationary ground motion field, in which the effects of coherent effect and traveling wave effect are considered. The model of K8 single-layer spherical reticulated shell with 120m span without lower support and the model of single-layer spherical reticulated shell with 120m span K8 with lower support are established. The seismic responses of the above three models are analyzed under the conditions of one-dimensional multi-point, one-dimensional consistent, multidimensional multi-point and multi-dimensional consistent input using the time-history dynamic analysis method in full load domain. It is shown that the influence of seismic spatial variation on the structure, especially the ring bar around the latticed shell, will be exaggerated without considering the influence of the lower support structure. The effect of seismic spatial variation on structure should be considered in seismic design. The influence of stiffness change of the lower supporting structure on the upper reticulated shell structure is investigated. The seismic responses of five groups of columns with different lateral stiffness to 120m span K8 single-layer spherical reticulated shell under multi-point input and multi-dimensional uniform input are calculated respectively. The influence of the stiffness change of the lower support structure on the seismic response of the latticed shell structure is analyzed.
【学位授予单位】：哈尔滨工业大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TU311.3;TU399

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