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索拉穹顶是一种新型大跨空间结构,比较了索拉穹顶和普通穹顶的自振频率及其对应的振型且较详细地讨论了这种新型结构的动力特性。然后,计算了各种参数(长跨比、矢跨比、索截面、索初始预应力、钢杆件截面)对索拉穹顶动力特性的影响。计算结果显示:索拉穹顶的动力特性优于普通穹顶;索拉穹顶的自振频率随矢跨比的增大,先增大后减小,随钢杆件截面、索截面的增大而增大;索的初始预应力对索拉穹顶的动力特性影响很大。 相似文献
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Based on the nonlinear displacement-strain relationship, the virtual work principle method was used to establish the nonlinear
equilibrium equations of steel beams with semi-rigid connections under vertical uniform loads and temperature change. Considering
the non-uniform temperature distribution across the thickness of beams, the formulas for stresses and vertical displacements
were presented. On the basis of a flowchart for analysis of the numerical example, the effect of temperature change on the
elastic behavior of steel beams was investigated. It is found that the maximal stress is mainly influenced by axial temperature
change, and the maximal vertical displacement is principally affected by temperature gradients. And the effect of temperature
gradients on the maximal vertical displacement decreases with the increase of rotational stiffness of joints. Both the maximal
stress and vertical displacement decrease with the increase of rotational stiffness of joints. It can be concluded that the
effects of temperature changes and rotational stiffness of joints on the elastic behavior of steel beams are significant.
However, the influence of rotational stiffness becomes smaller when the rotational stiffness is larger. 相似文献
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空间张弦结构抗震性能研究 总被引:1,自引:0,他引:1
为了了解空间张弦结构的动力特性及其抗震性能,首先对该结构和无下部索杆体系的单层网壳进行自振特性分析,然后通过时程分析讨论空间张弦结构在地震作用下的动力响应,并研究了撑杆数量、垂跨比、上弦梁刚度、预应力及拉索截面面积等参数对其动力性能的影响.分析结果表明下部索杆体系能增大空间张弦结构的刚度,空间张弦结构的低阶振型以竖向振动为主.撑杆数量、垂跨比及上弦梁截面的增加有利于增大结构刚度及提高结构抵抗整体变形的能力,但预应力和下弦拉索面积对空间张弦结构抗震性能的影响较小. 相似文献
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