【作者】 杨昌民；

【导师】 李宏男；

【作者基本信息】 大连理工大学 ， 防灾减灾工程及防护工程， 2011， 硕士

【摘要】 随着人们经济水平的提高和对地震灾害概念的加深,抗震设计作为保障人们生命安全和减少财产损失的一个重要手段,得到了各国学者不断深入的研究。传统的框架结构以其结构形式简洁,适用性较强等特点,在多层及一部分高层建筑中得到了广泛的应用。但由于其本身抗震能力不强,所以人们研究增加斜支撑来增强其抗侧力性能的方法。传统的钢支撑在受拉变形中能表现出良好的耗能能力,但当轴向受压时,由于支撑本身的抗整体失稳能力不强,很容易出现失稳屈曲现象,从而降低了支撑的耗能能力,没有发挥出其应有的性能。防屈曲支撑是对传统支撑的改进,在内芯钢板外围增加一圈约束钢框,起到约束内芯钢板变形的作用。从实验的滞回曲线上也能看出,防屈曲支撑受拉受压都能达到钢材的受力屈服点,曲线饱满圆润,抗震性能卓越。从20世纪70年代日本学者创造性地提出了防屈曲支撑的概念至今,30多年的发展使得防屈曲支撑无论在理论研究还是实验设计上,都得到了长足的发展。在1994年的美国北岭(Northridge earthquake)和1995年日本阪神(Kobe earthquake)的两次大地震中,防屈曲支撑结构形式的房屋也得到了真实的检验。从震害调查中可知,安装有防屈曲支撑的建筑破坏较小,房屋几乎没有出现倒塌,人员伤亡数量也非常少。本文结合防屈曲支撑的实验研究,对其进行了比较细致的ABAQUS有限元分析。这其中包括影响防屈曲支撑耗能性能的几个重要因素的分析,和防屈曲支撑设计方法的研究。在分析中,本文着重研究了对橡胶无粘结层部分的模拟方法,使得模拟结果更符合实验数据。其次,对安装有防屈曲支撑的一个实际框架结构进行地震作用下的有限元模拟研究,并和原有的纯框架结构进行耗能性能对比。同时分析了在不用抗震设防烈度下应用防屈曲支撑的建议。最后,在整体结构模拟的基础上,给出了安装有防屈曲支撑结构的经济性分析,对其能否适用于建筑上的广泛应用给出了评价。更多还原

【Abstract】 As the incensement of the economic level and the knowledge on the earthquake disaster, anti-seismic design as an important means to ensure the persons’safety and reduce the loss of property is get more and more research by scholars of most countries. The traditional frame-work for its simple structural form is gained wide application. However, because of its earth-quake resistance is not excellent; people consider strengthening the resistance by setting the braces.Traditional steel support can show good dissipation ability, but under the axis pressure, the support is prone to lose its back since its weaker resistance. Buckling-restrained brace (BRB) is the improvement of traditional steel support. From the experiment, BRBs could break under yield stress, and hysteresis curve is full, round as well as anti-seismic perfor-mance excellent.From 1970s, Japanese scholars creatively give a concept of BRB; BRBs get a widely re-search and application nowadays. In the Northridge earthquake of 1994 and the Kobe earth-quake of 1995, houses with BRBs were tested in an actual surrounding. From the investiga-tion, BRBs can keep the house against collapsed; and less people died.Base on the BRB’s experimental studies, a more detailed Abaqus finite element analysis is given, which includes the influence factors for the dissipation ability. In the analysis, an emphasized research is the simulation of rubber, which is unbonded layer of the BRBs.Secondly, BRBs are installed on a practical framework, and simulation gives a contrast against the existing framework structure without BRBs.Finally, analysis of economy is given on the condition of structure with BRBs, as well as the design advices.更多还原