论文部分内容阅读
通过对新广州站中央采光带杂交结构体系进行静力特性及整体稳定承载能力的研究,分析了上弦钢杆件截面积、预应力拉杆和下弦拉索截面积及其预应力水平等参数对其整体稳定承载能力的影响,并利用一致缺陷模态法分析了各种初始缺陷模式以及缺陷大小的影响。分析结果表明:杂交体系中下部索杆体系和上部面内拉杆可以较大地提高结构的刚度;材料非线性对该结构的整体稳定承载能力的影响不可忽略;该杂交结构体系端部区域是结构的薄弱部位,塑性区集中在结构两个端部;结构的承载能力随着钢杆件截面的增大而增大;上弦拉杆与下弦拉索的截面积和初始预应力的增加使结构的承载能力有所提高,但是预应力值增大过多会导致结构承载能力下降;1阶特征值屈曲模态是对结构最不利的缺陷模态,但大小为L/300的初始缺陷并不是最不利的。
Through the study on the static characteristics and the overall stable load carrying capacity of the central Guangzhou Lightning Belt hybrid structure system, this paper analyzes the cross-sectional area of the steel wire rod, the cross-sectional area of the prestressed tie rod and the cable and the prestress level, The overall stability of the carrying capacity of the impact, and the use of consistent defect modal analysis of the various initial defect modes and the impact of defect size. The results show that the lower rod system and the upper rod in the hybrid system can greatly increase the stiffness of the structure. The nonlinear effect of the material on the overall stability of the structure can not be neglected. The end region of the hybrid structure is structural The weak part and the plastic zone are concentrated on the two ends of the structure. The bearing capacity of the structure increases with the increase of the section of the steel bar. The increase of the cross-sectional area and the initial prestress of the winding and lower chord leads to the bearing capacity But the increase of prestress value will lead to the decrease of structural carrying capacity. The first order eigenvalue buckling mode is the most unfavorable structure mode, but the initial defect size of L / 300 is not the most unfavorable .