【摘要】 索-桁结构是一种有潜力的空间结构,但目前的研究尚不够深入.本文提出了一种圆形平面索-桁预应力结构,采用反应谱法和时程法分析,研究了其动力性能.结果表明,该种结构的频谱极为密集,振型较为复杂;这类结构采用反应谱法计算动内力将导致不可接受的误差,而应采用相应的时程分析法计算动内力.同时还得出了这种结构预应力的施加不可缺少,否则将有可能导致动力破坏的结论.更多还原

【Abstract】 The cable-truss is a potential space structure, but it has not been studied deeply. In this paper, a circular pre-stressed cable-truss structure was presented and its dynamic properties was studied by shapes-separation-spectra and time-history methods. The results showed that the structure’s frequencies are crowded and vibration shapes are complex, dynamic internal force of the structure by shapes-separation-spectra-method will cause unacceptable error, so time-history method should be used. Meanwhile, it is necessary for this structure to be pre-stressed, otherwise it may be destroyed in seismic action.更多还原