V形偏心支撑钢框架的抗侧刚度与极限承载力研究  

THE ELASTIC LATERAL STIFFNESS AND ULTIMATE CAPACITY OF V-ECCENTRIC BRACED STEEL FRAMES

作　　者：李慎[1] 苏明周[1] 李峰[1] 

机构地区：[1]西安建筑科技大学土木工程学院,西安710055

出　　处：《工业建筑》2015年第8期145-152,179,共9页Industrial Construction

基　　金：国家自然科学基金资助项目(51178382)

摘　　要：为了便于计算V形偏心支撑钢框架结构体系的层间侧移与耗能连梁转角,更好地理解V形偏心支撑受力特点,基于结构力学基本假定,给出其在侧向力作用下的耗能连梁剪力和支撑轴力计算式;依据侧向位移拆分原则,利用连梁剪力和支撑轴力表达式,推导出V形偏心支撑结构的弹性抗侧刚度,通过30个算例对比说明,抗侧刚度算式有较高的精度;在V形偏心支撑结构弹性内力分析的基础上,对比GB 50017—2003《钢结构设计规范》,对支撑杆件的设计提出新的建议;基于虚功原理和小变形假定:当已知外力分布时,依据偏心支撑达到极限状态时的典型屈服机制,推导出V形偏心支撑极限承载力算式,利用SAP 2000对10层算例进行推覆分析,验证极限承载力计算式。In order to compute story drift and link rotation conveniently and identify loading path and internal force distribution of V-eccentric braced steel frames（ ‘V-EBF’in brief）,the formulas of elastic axial forces of brace and shear force of link subjected to lateral loads were proposed based on the fundamental assumption of structural mechanics,and then the elastic lateral stiffness formula of V-EBF was put forward on the basis of lateral sway split method. The analysis results of 30 examples indicated that the elastic lateral stiffness formula had a higher precision.A new design method of the brace was suggested on the basis of the formulas. When lateral load distribution was known,the formula of ultimate capacity of V-EBF was derived based on virtual work principle,small deformation assumption and typical yielding mechanism of ultimate state. Pushover analysis of 10-storey V-EBF frame was conducted by finite element software SAP 2000,with which the formula of ultimate capacity was verified.

关 键 词：V形偏心支撑 耗能连梁 弹性抗侧刚度 支撑轴力 极限承载力 

分 类 号：TU391[建筑科学—结构工程]