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以跨度800 m凯威特型巨型网格结构为研究对象,对其在多遇地震作用下的受力性能进行研究。基于位移权重系数和内力权重系数,对瑞利阻尼系数计算方法进行了修正。采用时程分析法对跨度800 m的凯威特型巨型网格结构进行了8度多遇地震作用下结构反应的计算,对其位移和内力反应进行了分析。结果表明:结构最大位移和最大内力的放大系数在1.1~1.2之间;通过对比振型截断法和振型过滤法,发现由振型过滤法确定的组合振型,可使多维反应谱法的计算结果精度更高且计算速度更快,应用多维反应谱法对结构进行计算,并与时程法的结果进行对比,由两种方法计算得到的内力及位移反应平均误差在10%左右,且反应包络线趋势一致。
Taking the 800-kd Kaiweite giant grid structure as the research object, the force performance of the giant-grid structure subjected to frequent earthquakes is studied. Based on displacement weight coefficient and internal force weight coefficient, the calculation method of Rayleigh damping coefficient was modified. The time-history analysis method was used to calculate the structural response of a Kaweite giant grid structure spanning 800 m with an earthquake of 8 degrees. The displacement and internal force responses were analyzed. The results show that the magnification factor of the maximum displacement and the maximum internal force of the structure is between 1.1 and 1.2. By comparing the mode shapes truncation method and the mode shape filtering method, it is found that the mode shapes determined by the modal filtering method can make the multi-dimensional response spectrum method The calculation results are more accurate and the calculation speed is faster. The multi-dimensional response spectrum method is used to calculate the structure and compared with the time-history method. The average error of the internal forces and displacement responses calculated by the two methods is about 10% The trend of reaction envelope is consistent.