钢管桁架拱结构抗震性能研究-结构工程专业论文.docxVIP

万方数据 万方数据 摘 要 钢管桁架拱结构作为一种典型的空间结构体系，有较好的力学特征，在高炉 炼铁厂房等行业中已得到广泛应用，因此对这种大跨度结构的需求越来越大。本 文以某原料厂的钢管桁架拱结构为研究对象，对结构的自振特性和动力响应进行 了较为系统的研究。 运用有限元软件对钢管拱桁架结构的自振特性和动力响应进行研究。自振特 性的研究中，主要分析了结构的模态分析和自振特性在变参数结构矢跨比、榀间 距、截面高跨比和宽高比的变化规律，在自振特性的研究基础上分析结构的动力 响应，动力响应的研究是通过分析结构在变参数结构的矢跨比、榀间距、截面高 跨比和宽高比的变化规律，对具有代表性的杆件内力的变化情况进行总结。 通过模态分析，得到结构的振型图，通过分析前十阶振型的变化规律，可得 前两阶主要是以水平振型，后面的振型就相对复杂些，水平竖向不定有时还伴随 扭转；在变参数分析中，根据自振特性分析曲线图可知，结构的榀间距、截面的 高跨比和宽高比对钢管拱桁架结构的自振特性有一定的影响，结构的矢高比对钢 管拱桁架结构的动力特性影响很小。根据动力响应分析中杆件内力曲线图可知， 主要变参数对动力响应有一定的影响并呈现一定的规律，结构的高跨比对结构动 力响应影响较明显，分析变化规律得到一个合理的设计范围，为此类结构的设计 提供参考。 关键词：钢管桁架拱结构；矢跨比；榀间距；高跨比；宽高比； I Abstract As a typical space structure system, steel tube arch truss structure has remarkable mechanical behavior. Because of this important feature, steel tube arch truss structure has been widely used in areas such as blast-furnace ironmaking plants. As we can see, the need of this kind of long-span structure has become increasingly stronger. This need presents the value of the author ’s study. In the paper, through the research object of steel tube arch truss structure in a specific raw material plant and the study method of finite elements software, the structure’s self-vibration characteristic and dynamic response will be systematically analyzed. In the research of self-vibration characteristic, the structure’s modal analysis and the variable element of self-vibration characteristic will be analyzed emphatically. Upon this basis, the study of dynamic response will be presented. The variation of typical member internal forces will be summarized through the analysis of the structure’s variation elements. Graphs of vibration types can be achieved upon the model analysis. The first 10 modes can tell us that the first two are mainly horizontal, however, the rest are more sophisticated, horizontal or vertical and sometimes twisted. In the analysis of variation elements, span ratio, truss span, section depth-span ratio and its aspect ratio are chosen. Through the gra