单层球面网壳结构地震空间效应研究

发布时间：2018-06-12 02:04

  本文选题：单层球面网壳 + 地震动记录调幅　； 参考：《哈尔滨工业大学》2014年博士论文

【摘要】：地震动传播至结构场地时具有空间相关性和相干性,考虑地震动空间相关性和相干性的多点输入比一致输入更符合实际。由于在有效的历史地震动记录中很难选取到与预先定义的支座布置、震级(或烈度)和震中距等信息相匹配的数据,因而需要模拟符合要求的地震动记录。空间相干性对结构地震反应的影响已有调查但空间相关性和相干性对单层球面网壳结构地震反应的影响还没有研究过。此外,即使在一致输入下,网壳结构时程分析用地震动记录数量及其统计学依据还是未知的。网壳结构因其具有自重轻、结构刚度好等一系列特点,在体育场馆等建筑中获得了大量应用。地震是结构服役期内可能承受的主要动力作用之一,因此研究网壳结构设计或校核用地震动记录数量以及多点输入下的地震反应是有必要的。主要研究内容和成果如下:1、行波输入下网壳结构地震反应的影响因素分析计算不同跨度、不同屋面质量、不同矢跨比和不同杆件截面尺寸的无下部支承单层球面网壳结构在行波输入下和一致输入下的地震反应,分析网壳结构地震空间效应与结构参数和地震动参数的关系。结果表明:地震空间变化性对网壳的影响程度与结构和地震两方面因素密切相关,是否考虑地震空间变化性须由这两方面因素综合确定。2、随机空间相干相关激励作用下网壳结构地震反应分析运用扩展随机点源法来模拟地震动记录,并将模拟记录应用于单层球面网壳结构,旨在调查空间相干相关多点输入下结构反应与一致输入的差异,评价空间相干性和空间相关性对结构地震反应的相对重要性,并进而估计地震空间相关和相干的不确定性对网壳结构反应统计值的影响,分析结果表明,傅立叶幅值谱的空间相关性对结构地震反应有很大影响,同时考虑空间相干性和空间相关性是非常重要的。与空间相干相关多点激励下获得的结构反应相比,一致输入会严重低估地震荷载效应。3、支承刚度对空间相干相关激励下网壳地震反应的影响通过参数分析来调查空间相关性和相干性对不同刚度下部支承的网壳地震反应的影响。从时程反应中提取不同刚度下部支承结构网壳的地震反应的统计值,并且与一致输入下获得的结果比较。结果表明考虑空间相干性和相关性是重要的,特别是对于下部支承结构刚度较大的网壳结构。分析结果也说明,在空间相干相关地震激励下,较柔的下部支承结构可以起到一个“基础隔震”系统的作用,从而减小在较大地震作用下结构屈服或损伤的程度。随着下部支承结构刚度的增加,采用一致输入假设对于网壳杆件轴力会被低估25%以上,对于柱底剪力会被低估超过100%。4、三维空间相干激励下网壳结构强震反应分析基于一个现有相干函数模型的形式,对SMART1和LSST台阵记录统计回归,获得了适用于网壳结构的相干函数模型。应用该相干函数模型模拟地震动。采用荷载域全过程分析方法,分析空间相干性对无下部支承和有下部支承的网壳结构三维地震反应的影响。分析结果表明:地震空间相干性在两个水平方向和竖直方向上对网壳结构均有不同程度的影响,同时考虑地震三个分量的空间相干性是必要的;下部支承结构可以有效地吸收输入地震动的差异,从而减小了地震空间相干性对网壳结构的影响。5、地震动记录数量和调幅对网壳结构地震需求统计的影响对常用地震动强度参数的考虑因素进行分析,按是否考虑结构的动力特性将其分为地震动绝对强度和地震动相对强度,提出了一种可用于工程的地震动相对强度参数即敏感频率反应谱值Sa(fp)。对由最少数量地震动记录获得的单层球面网壳结构反应的统计值进行评估,分析基于峰值加速度和加速度反应谱调幅地震动记录对单层球面网壳结构地震反应统计值的影响。计算了166条地震动记录分量作用下网壳结构的时程响应,分别考虑所有地震动记录和按规范标准随机选取3条或7条记录,获得了网壳结构杆件轴力和基底剪力的统计值。结果可用来建议单层球面网壳结构分析或设计用地震动记录数量以及地震动记录调幅首选地震动强度参数。
[Abstract]:The ground motion is spatially correlated and coherent when the ground motion is transmitted to the site. Considering the spatial correlation and the coherence of the ground motion, the multipoint input is more practical than the uniform input. It is difficult to select the data matching the information of the magnitude (or intensity) and the epicentral distance in the effective historical ground motion record. The effect of spatial coherence on structural seismic responses has been investigated, but the effect of spatial correlation and coherence on seismic responses of single-layer spherical reticulated shells has not yet been studied. In addition, the number and statistics of ground motion records for the time history analysis of the reticulated shell structure, even under uniform input Because it has a series of characteristics such as light weight and good structural stiffness, a large number of applications have been obtained in stadiums and gymnasiums. The earthquake is one of the main dynamic functions that may be subjected during the service period of the structure. Therefore, the structure design of the reticulated shell or the number of ground motion records for the reticulated shell and the earthquake under multi input are studied. The main research contents and results are as follows: 1, analysis and calculation of the influence factors of the seismic response of the reticulated shell structure under the traveling wave input, the analysis and calculation of the seismic responses of different span, different roof mass, different vector span ratio and the cross section size of a single single layer spherical reticulated shell under the line wave input and the uniform input The relation between the seismic spatial effect of the reticulated shell structure and the structural parameters and the ground motion parameters shows that the influence degree of the spatial variability of the seismic space is closely related to the two factors of the structure and the earthquake. Whether the spatial variability of the seismic space should be considered by these two factors, the.2, the latticed shell knot under the random spatial coherent correlation excitation The seismic response analysis uses the extended random point source method to simulate the seismic record, and applies the simulated record to the single layer spherical reticulated shell structure. The purpose is to investigate the difference between the structural response and the uniform input under the coherent correlation of spatial correlation, and to evaluate the relative importance of spatial coherence and spatial correlation to the structural seismic response, and then estimate the relative importance of the seismic response to the structure. The analysis results show that the spatial correlation of Fu Liye amplitude spectrum has a great influence on the structural seismic response, and it is very important to consider spatial coherence and spatial correlation. The structural response obtained under the space coherence correlation multi point excitation is very important. In contrast, the uniform input will seriously underestimate the seismic load effect.3, the influence of the support stiffness on the seismic response of the reticulated shell under the spatially coherent correlation, and investigate the effect of spatial correlation and coherence on the seismic response of the reticulated shells supported by different stiffness under the parameter analysis. The statistical value of the seismic response is compared with the results obtained under the uniform input. The results show that it is important to consider the spatial coherence and correlation, especially for the latticed shell with a larger stiffness in the lower supporting structure. The effect of the base isolation system reduces the degree of yield or damage of the structure under the larger earthquake. With the increase of the stiffness of the lower support structure, the uniform input hypothesis is underestimated for the axial force of the reticulated shell by more than 25%, and the shear of the bottom of the column will be underestimated by more than 100%.4, and the strong shock of the reticulated shell structure under three-dimensional space coherent excitation is reversed. In the form of an existing coherent function model, a coherent function model suitable for the lattice structure of SMART1 and LSST arrays is obtained. The coherent function model is used to simulate the ground motion. The full process analysis method of load domain is used to analyze the space coherence to the latticed shell with no lower support and lower support. The results show that the seismic spatial coherence has different degrees of influence on the structure of the reticulated shell in two horizontal direction and vertical direction, and it is necessary to consider the spatial coherence of the three components of the earthquake, and the lower support structure can effectively absorb the difference of the input ground motion, thus reducing the earthquake. The influence of spatial coherence on the structure of the reticulated shell.5, the influence of the number of ground motion records and the amplitude and amplitude on the seismic demand statistics of the reticulated shell structure, the factors considered for the commonly used ground vibration intensity parameters are analyzed. According to whether the dynamic characteristics of the structure are considered, it is divided into the absolute and seismic dynamic strength of the ground motion, and a kind of engineering is proposed. The relative intensity parameter of the ground motion is Sa (FP). The statistical value of the structural response of a single spherical reticulated shell obtained by the minimum number of ground motion records is evaluated. The effect of the seismic record on the seismic response of a single-layer spherical reticulated shell based on the peak acceleration and the acceleration response spectrum is analyzed. 166 The time history response of the reticulated shell structure under the action of the ground motion recording component, 3 or 7 records are randomly selected from all ground motion records and according to the standard standard. The statistical values of the axial force and the base shear of the reticulated shell structures are obtained. The results can be used to suggest the analysis of the single layer spherical reticulated shell structure and the number of ground motion records and the earthquake. The first first ground vibration intensity parameter of the dynamic recording.
【学位授予单位】：哈尔滨工业大学
【学位级别】：博士
【学位授予年份】：2014
【分类号】：TU311.3;TU399
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本文编号：2007761