论文部分内容阅读
巨型钢框架—预应力复合支撑体系是现代高层建筑中的一种新型抗侧体系,本文基于弹性反应谱对其进行抗风、抗震设计,然后在倒三角型分布和均匀分布的两种水平荷载加载模式下进行Pushover分析,研究出该结构体系在不同水平加载模式下的破坏机理,考察其抗侧刚度、拉索受力特征及构件先后出现的屈服机制和结构的整体抗震性能。研究表明,倒三角型分布的结构水平极限荷载和弹性抗侧刚度都小于均匀分布得到的结果;拉索的最大拉应力均未达到屈服强度650MPa,并且随着水平荷载的逐渐增加,一部分拉索拉应力逐渐减少,直至退出工作,而另一部分拉索则在预拉应力的基础上拉应力进一步增大;巨型钢框架—预应力复合支撑体系各构件的破坏顺序为巨型梁腹杆最先出现屈服,而后依次分别是巨型柱肢间的支撑、巨型八字支撑、巨型柱肢间的楼层梁;对该结构体系不能再沿用弹性设计反应谱的方法进行抗震设计,而应采用基于建筑抗震性能化的理念来进行合理、经济的抗震设计。
Giant steel frame-prestressed composite support system is a new type of anti-side system in modern high-rise buildings. Based on the elastic response spectrum, this paper designs a wind-resistant and anti-seismic design, and then in the inverted triangular distribution and uniform distribution of two horizontal loads Pushover analysis was carried out under loading mode to study the failure mechanism of the structural system under different horizontal loading modes. The anti-side stiffness, the characteristics of cable tension and the yield mechanism of the components and the overall seismic performance of the structure were investigated. The results show that both the horizontal ultimate load and the elastic lateral stiffness of the inverted triangular distribution are less than the uniform distribution. The maximum tensile stress of the cable does not reach the yield strength of 650MPa. With the gradual increase of the horizontal load, The tensile stress decreases gradually until it withdraws from work while the tensile strength of the other part of the cable increases further on the basis of the prestressing stress. The destroying order of the members of the giant steel frame-prestressed composite support system is that the giant beam webbing first appears Yielding, and then in turn are the giant columnar support, giant bracing, giant columns between the floor beams; the structure can no longer use the elastic design of the response spectrum method for seismic design, and should be based on the seismic performance of the building Concept to carry out reasonable and economical seismic design.