【作者】 成鸿博；

【导师】 王秀丽； 邵继新；

【作者基本信息】 兰州理工大学 ， 结构工程， 2010， 硕士

【摘要】 在高层、超高层建筑结构设计中,水平位移是关键的控制因素。当高层建筑框架结构的抗侧力刚度不能满足设计要求时,可考虑沿竖向利用建筑设备层、避难层空间,设置适宜的水平伸臂构件,构成带加强层的高层建筑结构。加强层的设置可使周边框架柱有效地发挥作用,增大结构抗侧刚度,是风荷载作用下减小高层建筑侧向位移的一种有效地方法；但在地震作用下,加强层的设置使结构刚度产生突变,其必然导致结构内力突变以及整体结构传力途径的改变,从而使结构的破坏较容易集中在加强层附近,形成薄弱层,使结构的损坏机制难以呈现“强柱弱梁”和“强剪弱弯”的延性屈服机制。鉴于带水平加强层的高层建筑结构对于抗震有诸多不利,本文提出把约束屈曲支撑技术应用于超高层钢框架结构,即将加强层桁架中的刚性普通支撑用耗能部件(约束屈曲支撑)代替,形成耗能减震层。在地震作用下带有耗能减震层的结构主要通过约束屈曲支撑来耗散输入到结构中的能量以减轻结构的动力反应,从而更好地保护主体结构的安全。本文以某超高层建筑结构为例,利用ANSYS软件建立其三维模型,并对带加强层的结构和带约束屈曲支撑耗能减震层的结构进行了结构刚度分析、结构内力分析和位移时程分析,通过与传统加强层结构的设计方法对比,可以看出约束屈曲支撑比加强层结构更能有效地控制结构整体的地震反应,约束屈曲支撑发挥了自身良好的耗能特性,使地震波中主要的能量通过约束屈曲支撑耗散,而建筑物主体结构只承受地震能量的一部分,这对建筑结构抗震是有利的。更多还原

【Abstract】 Structural lateral displacement becomes the main control index during the high-rise building structure designs.When the frame-corewall structure is not so rigid,the refuge story and facility story should be used form the reasonable horizontal outriggers,so as to the high-rise binding having strengthened stories.It is an effective way to decrease structural lateral displacement against the influence of wind by setting the horizontal strengthened stories.When come to the influence of earthquake,this designs will cause the sudden variation of structural stiffness and internal force,and will come into being weal story,which will make it difficult for the yield mechanism of the structure to car-ry out "strong column and weak" and"strong shear weak bending" extending bendi-ng system.In view of horizontal strengthened story of high-rise building structures has many adverse in earthquake,in this paper we use buckling-restrained braces in super high-ri-se steel frame structure,ordinary brace in horizontal strengthened story with energy di-ssipation (buckling-restrained brace) replaced to formation of seismic energy dissipat-ion story.Under earthquake energy dissipation structure with buckling-restrained brac-es reduce the dynamic response，in order to better protect the main structure.Based on this super high-rise building, for example, using ANSYS software to buil-d their three-dimensional model.analysis strengthend story and energy dissipation wit-h buckling-restrained brace of structural stiffness,internal force and displacement time history,by comparing with strengthened story structure, we can see that buckling-restr-ained brace more effective control than strengthened story structure in seismic respon-se,buckling-restrained brace played a good energy characteristics of its own,so that the ma-in energy dissipation through buckling-restrained brace. The main structure of bui-lding to withstand only a small part of the seismic energy,which is beneficial to buildi-ng.更多还原