摘要
与传统外围整体式防屈曲支撑不同的是,装配式组合防屈曲支撑的外围构件由多个组件通过连接件拼装而成,故外围连接的设计方法是此类防屈曲支撑构件设计理论的重要组成部分。针对一种四角钢组合约束型防屈曲支撑,已有适用于单向弯曲状态的外围连接螺栓内力的简化计算方法。但上述方法的适用性尚需经过精细有限元数值分析加以验证,并需进行适当修正,使其具有足够的计算精度,这是该文进行的研究工作之一。另外,由于内核构件与外围构件之间间隙的存在,防屈曲支撑构件更为常见的变形模式表现为双向弯曲变形,所以该文还将在单向弯曲状态所得到的螺栓内力计算公式的基础上进行进一步的组合,得到双向弯曲状态下的螺栓内力计算公式。该文最终给出了适用于四角钢组合约束型防屈曲支撑的外围螺栓连接的完整设计方法。
In the assembled steel buckling-restrained brace （ABRB）, the restraining part is formed by several outer parts around its core. Therefore the connection design of the outer restraining parts is a main focus in the overall design theory of ABRB, and this feature is quite different from that of the traditional BRBs which have an outer overall restraining part around the core. A simplified design method has been proposed to determine the bolt forces in a four-angle ABRB, but it is only fit for the situation that the outer restraining parts bends in one direction. Firstly, this paper presents the numerical results to verify the simplified design method already obtained, and the method is modified accordingly. Secondly, the gap between the core and the outer restraining parts makes BRB deform normally in two directions, therefore this paper also aims to determine bolt forces for the more general situation. The approach proposed in this study is to combine the bolt forces selectively, which are induced by the BRB＇s bends in each direction. Finally an improved connection design method for the four-angle ABRB is achieved.
出处
《工程力学》
EI
CSCD
北大核心
2014年第2期15-24,34,共11页
Engineering Mechanics
基金
国家自然科学基金项目(51178243)
关键词
装配式
防屈曲支撑
螺栓
设计方法
撬力
assembly type
buckling-restrained brace
bolt connection
design method
prying force
