本文選題：彈簧隔振基礎 + 自振特性�。� 參考：《北方工業(yè)大學》2015年碩士論文

【摘要】：汽輪發(fā)電機組是發(fā)電廠的核心設備,隨著我國電力建設的快速發(fā)展,大功率汽輪機得到越來越多的使用,為改善機組的運行環(huán)境,采用彈簧隔振基礎是非常有效的方法。由于隔振彈簧將臺板與基礎下部結(jié)構(gòu)完全隔開,隔振彈簧對基礎整體結(jié)構(gòu)的自振特性及地震響應勢必產(chǎn)生較大影響。模型試驗能夠形象、真實、直接地反映出基礎的動力特性和地震響應,從而檢驗結(jié)構(gòu)是否滿足抗震設計要求。 本文以某汽輪發(fā)電機組彈簧隔振基礎為研究對象,設計制作了1：8的試驗模型,通過模型試驗對彈簧隔振基礎的隔振及抗震性能進行了研究。具體工作如下： 按照設計圖紙及相似關系進行1：8縮尺模型的設計與制作。 采用三點隨機激振、空間響應測量的方法對基礎進行動力特性試驗,獲得了基礎的自振頻率、振型和阻尼比。分析基礎的自振頻率和振型特點可知,采用彈簧隔振器使基礎的自振頻率明顯降低,成功避開了設備的工作頻率的同時,還避開了地震的卓越周期。 按照力的傳遞系數(shù)的定義進行傳遞系數(shù)的測試,隔振效果良好。由于本文采用的測試方法沒有剛性臺板的假定,所以比假定為單自由度體系的簡化計算方法更合理。 通過7度多遇地震和罕遇地震作用下的擬動力試驗研究了汽輪機基礎的抗震性能,測得了基礎的鋼筋應變、位移、速度、加速度和恢復力響應時程,以及滯回曲線、裂縫的開展情況、層間位移角等。試驗結(jié)果證明,在地震作用下,減振彈簧基礎符合《建筑抗震設計規(guī)范》標準,達到了彈簧減震的目的。
[Abstract]:Turbine-generator unit is the core equipment of power plant. With the rapid development of electric power construction in our country, high-power steam turbine is more and more used. In order to improve the operating environment of the unit, it is very effective to adopt spring vibration isolation foundation. Since the vibration isolation spring completely separates the platform plate from the substructure of the foundation, the vibration isolation spring will have a great influence on the natural vibration characteristics and seismic response of the whole foundation structure. The model test can reflect the dynamic characteristics and seismic response of the foundation directly and vividly, so as to verify whether the structure meets the requirements of seismic design. Taking the spring vibration isolation foundation of a turbogenerator unit as the research object, the 1:8 test model is designed and made in this paper. The vibration isolation and seismic performance of the spring isolation foundation are studied by the model test. The specific work is as follows: Design and manufacture the 1:8 scale model according to the design drawings and similar relations. The dynamic characteristics of the foundation are tested by means of three point random excitation and spatial response measurement. The natural vibration frequency, mode shape and damping ratio of the foundation are obtained. Based on the analysis of the natural frequency and mode characteristics of the foundation, it can be seen that the spring vibration isolator can obviously reduce the natural vibration frequency of the foundation, thus successfully avoiding the working frequency of the equipment and avoiding the excellent period of the earthquake at the same time. According to the definition of force transfer coefficient, the effect of vibration isolation is good. Since the test method adopted in this paper does not have the assumption of rigid plate, it is more reasonable than the simplified calculation method which is assumed to be a single degree of freedom system. The seismic behavior of steam turbine foundation was studied by quasi dynamic tests under frequent and rare earthquakes. The response time history of steel bar strain, displacement, velocity, acceleration and restoring force and hysteretic curve were measured. The development of cracks, interstory displacement angle and so on. The test results show that the vibration absorption spring foundation meets the standard of Building Seismic Design Code under earthquake action and achieves the purpose of spring damping.
【學位授予單位】：北方工業(yè)大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：TU435;TU476.1

【參考文獻】

相關期刊論文 前10條

1 尹學軍,王偉強,沙曾p，

本文編號：1851880