新型消能伸臂体系的动力可靠度  

Dynamic Reliability of Novel Damped Outrigger System

作　　者：谭平[1] 方创杰[1] 王磊[1] 周福霖[1] 

机构地区：[1]广州大学工程抗震研究中心,广东广州510405

出　　处：《西南交通大学学报》2014年第1期33-38,65,共7页Journal of Southwest Jiaotong University

基　　金：国家973计划资助项目(2012CB723304);"十二五"国家科技支撑计划项目(2012BAJ07B02);国家自然科学基金重大研究计划资助项目(91315301-07);教育部新世纪优秀人才支持计划资助项目(NCET-11-0914);广州市羊城学者科技计划资助项目(10A032D)

摘　　要：针对高层伸臂结构体系提出设计黏滞阻尼器型(VD)或防屈曲支撑型(BRB)2种新型消能伸臂体系.将概率密度演化方法引入新型消能伸臂体系分析中,考虑随机源分别来自场地激励和阻尼器参数,采用KanaiTajimi谱生成人工地震动,提出从正态分布随机变量中选取15个离散代表点的2.5倍均方差法,采用总变差不增有限差分格式(TVD)给出最大层间位移角的概率密度演化曲线,采用等价极值法(EVEM)研究其动力可靠度与层间位移角性能目标的关系.研究结果表明:2种新型消能伸臂体系均比传统抗震结构有更高的可靠度;相对而言,黏滞阻尼器型对随机场地激励有较高的可靠度,而防屈曲支撑型则对随机阻尼器参数有更好的可靠性.因此,将高层建筑中冗余的伸臂设计成新型消能伸臂体系能有效提高结构在地震作用下的安全性,可在实际工程中推广应用.Two novel damped outrigger systems, viscous type （VD） and buckling restrained brace type （BRB）, were presented for high rise buildings with outriggers. The probability density evolution method （PDEM） was introduced into the analysis of such systems. Random sources from site excitation and damper parameters were considered, respectively. The Kanai-Tajimi model was used to generate artificial ground motion. The 2.5-times mean square error method with 15 discrete representative points from random normal variables was proposed. The total variation diminishing finite differential scheme （TVD） was applied to provide the probability density evolution of maximal story drift angle, and the equivalent extreme value method （EVEM） was utilized to analyze the relationship between dynamic reliability and targeted story drift angle limit. The research results show that both proposed novel damped outrigger systems can reach higher reliability than traditional aseismatic structures. The VD type outrigger system possesses a high reliability under random site excitation, while the BRB type outrigger system is more reliable in the case of random damper parameters. Therefore, the design of redundant outriggers as damped outriggers is capable of increasing the safety of high-rise buildings and it is worthwhile to popularize and apply them in real engineering.

关 键 词：动力可靠度 消能伸臂 消能体系 概率密度演化 等价极值 

分 类 号：TU311.3[建筑科学—结构工程]