针对设备隔震的钢结构窑尾的地震反应探究.doc

题目 针对设备隔震的钢结构窑尾的地震反应研究 Title Study on seismic response of steel structure of kiln equipment isolation PAGE \* MERGEFORMAT 44 摘 要 钢结构窑尾具有能抗震、施工便捷、重量轻等优点，在国内外得到广泛的运用。但是在实际应用过程中，却因为工艺的特殊要求，平面尺寸小，开洞不规则，层高大且变化多，从而导致结构的刚度分布不规则，在设计过程中会发现构件的内力、层间位移和位移角大，这势必会使构件截面变大，从而增加了建设成本。 本文主要是研究通过在设备下设置隔震支座，达到耗散地震能量，增大结构阻尼并减小结构地震效应的目的，为钢结构窑尾的设计开拓了一个新的思路。本文的主要研究内容如下： 对隔震支座的研究，根据研究需要和规范规定隔震单元采用两节点间连接形式，隔震支座采用单独的隔震单元，作为结构与设备连接单元。隔震单元拥有线性和非线性属性，其中线形属性包括线性分析时使用的有效刚度和有效阻尼，非线性属性包括非线性分析工况使用的刚度，屈服力和屈服后的刚度比。 以某地拟建的窑尾结构为工程背景，采用SAP2000建立不设隔震支座的普通窑尾钢结构的有限元模型，对其进行了模态分析，7度、8度反应谱分析，7度、8度多遇地震时程分析，7度、8度罕遇地震时程分析，并提取了各工况下的基底剪力、层间位移、层间位移角，发现都较大，有些甚至接近规范要求的限值。 采用SAP2000建立设置隔震支座的窑尾结构模型，对其进行了模态分析、7度、8度反应谱分析，7度、8度多遇地震时程分析，7度、8度罕遇地震时程分析，提取各工况下的基底剪力、层间位移、层间位移角，并和普通窑尾结构的计算结果进行对比，发现各参数都有明显的减小，进而证明了在设备下设置隔震支座后可以有效地改善结构的抗震性能。 关键词：窑尾,隔震支座,抗震性能,反应谱分析,时程分析 Abstract Steel-structure preheat has a series of advantages, such as light weight, well earthquake resistance, easy construction, so that it is developed and applied universally all over the world. But in the process of construction, special process require small horizontal span size, irregular open hole , higher pace height and different changes, which lead to non-uniform distribution of stiffness of structure. In the process of design, we find that structural member force, story drift, layer displacement angle are bigger, which lead to bigger component section, higher cost. In this paper, isolation bearing is set under the equipment resulting in dissipate of earthquake energy, increase of structural damping and decrease of seismic response .A new idea of design of steel-structure preheat is obtained from the research. The main research contents and results are as follows: 1、Research of isolation bearing. According to the requirements and the rules of code, the element of seismic isolation adopt connecting format between two nodes and isolation bearing use single element, which connect the structure and equipment. The element of seismic isolation has