【作者】 韩强；

【导师】 左咏梅；

【作者基本信息】 河北工程大学 ， 结构工程， 2014， 硕士

【摘要】 平板网架是通过杆件规则叠加而形成的一种空间结构形式，网架节点是按照空间形式规则，将杆件组成一体。近些年我国煤炭产量显著增加，为满足电厂的实际需要，全国许多工厂都应用网架形式的储煤棚。空间网格结构，在实际应用中力学性能表现优良，同时具有施工机械化、生产周期短的性能，故被广泛应用在储煤棚，展览馆，火车站等建筑中。本文通过实际工程项目分析研究平板网架的静态特性，动态特性。主要内容有：1.通过有限元分析软件ANSYS构建空间网架结构的储煤棚的三维空间模型。按照实际荷载状况，结合最不利的组合情况，分析其受力后的变形特性及力学特性。2.通过实际模型的静力分析，以用钢量建立工程分析函数，在网架的杆件尺寸，强度、刚度和稳定方面以及整体高度设置边界约束条件进行深入的数值计算分析，达到对整体结构的最优化设计。3.空间网架结构跟传统钢结构相比，具有静力荷载下力学分析繁琐复杂，动力荷载下（如地震波的作用）运动形式多变的特点，造成实际计算难度大。但随着计算机在大规模数值、几何分析的应用，相应软件的研发不断完善，利用有限元分析方法在大跨空间网架应用逐渐完善。本文基于实际的储煤棚工程，使用有限元分析软件ANSYS，对其进行加载数值分析，得到其静力及动力分析数据，获得网架杆件中的最大应力、最大挠度。通过模拟地震波分析，得出最不利振型下的结构具体节点的动力响应及动力学特性，为进一步优化设计提供依据。更多还原

【Abstract】 Space grid plate is made of a space form in accordance with the applicationrequirements and design specifications of the structure obtained, which is inaccordance with the space bar form nodes rules to make the lever on the compositionof the network nodes together. China’s coal production increased significantly inrecent years, as well as to meet the actual needs of the plant, and many plants are builtnationwide this form of coal storage shed. Space in the form of a grid structure,mechanical properties in practical applications performed well, but also has modernmechanized quick assembly performance. In economic terms, the construction periodis shorter, which fully reflects the excellent performance of large-span spatial latticestructure. It has been widely used in the coal storage shed, exhibition halls, railwaystations and other buildings. In this paper, by analyzing the actual project to study thestatic characteristics and dynamic characteristics and construction programs. Themain contents are:(l) ANSYS to build three-dimensional model of a specific space grid structure inthe form of coal storage shed by the finite element analysis software. The actualloading conditions suffered by, the use of load combination analysis method todetermine the structure of the study the most unfavorable combination ofcircumstances, and then analyze its force after deformation characteristics andmechanical properties on this basis.(2) The actual model through static analysis to establish the actual amount ofsteel lightest engineering analysis functions, specifically in the grid of the rod size,strength, stiffness and stability as well as the overall thickness of the boundaryconditions set numerical depth analysis to achieve the optimization of the overalldesign of the structure.(3) Spatial grid structure with traditional simple steel compared with static loadsunder mechanical analysis cumbersome and complex, dynamic loads such as the roleof sport in the form of seismic waves under the changing characteristics, whichresulted in the actual calculation difficult problem. But with the large-scale numericalcomputing, geometric analysis applications, particularly continuous improvement andthe development of corresponding software functions, making the application of finiteelement analysis in terms of long-span space truss gradual improvement.Based on the practical requirements of a particular coal storage shed for the foundation, through the establishment of its functionality to meet thethree-dimensional model, using finite element analysis software ANSYS, its loadnumerical analysis, spatial grid structure of static and dynamic analysis of the datafrom which the software automatically screening, all the bars of the grid themaximum stress, maximum deflection. By simulating seismic wave analysis, applyinga variety of modes of the structure, to find the most unfavorable structural vibrationmode, and then by the time history response analysis method, draw power structure ofa specific node under the most unfavorable response modes, and by analyzing theresults dynamics of key points, provide the basis for further design and optimization.更多还原