基于性能和需求的消能减震设计方法在震后框架结构加固中的应用  

Application of energy dissipation method in post-earthquake RC frame retrofit based on performance and demand

作　　者：翁大根[1] 张瑞甫[1] 张世明[1] 吕西林[1] 

机构地区：[1]同济大学结构工程与防灾研究所,上海200092

出　　处：《建筑结构学报》2010年第S2期66-75,共10页Journal of Building Structures

摘　　要：提出了基于性能/需求优化配置消能支撑的设计方法,即构建混合消能支撑体系。该体系在建筑结构的底层使用防屈曲耗能支撑,在其余一些层配置主要由黏滞阻尼器构成的组合消能支撑。在分析方面,提出了以结构层间剪力、层间位移成比例优化配置阻尼力的概念,以及简化计算消能支撑附加阻尼比的方法。此外提出了对加固结构关键构件的强度校核方法和连接节点的构造措施。列出了实施这种方法的步骤,并以汶川大地震后某实际建筑的加固为例进行说明。基于性能和需求的消能减震抗震加固方法对震后建筑进行加固分析相对便捷,消能减震支撑的使用有利于改善结构薄弱层的抗震性能,加固效果的评估清晰。混合消能支撑相对来说性价比要高些。通过分析可知,此方法使得阻尼器在结构中的配置更为合理,在小、中、大震时阻尼器的耗能能力都得到了很好地发挥。采用消能减震支撑的加固措施,减少了结构加固的工程量,对原建筑结构影响较小。这种布置耗能装置的方式有利于地震能量在第一时间进行耗散,削减地震响应的第一峰值,并且有利于地震能量向下部基础传播。Some suggestions for application of energy dissipation method,which is the optimal allocation method of energy dissipation braces based on performance-demand(configuring hybrid energy dissipation braces system),are presented in this paper.The bucking restrained braces(BRBs) are used in the ground floor and the viscous damper combination energy dissipation braces are used in some other floors for building structure.For the structural analysis,a concept which is that the story damper force is proportional to the story shear and story drift and a simplified calculation method of additional damping ratio of energy dissipation braces are proposed.In addition,a strength checking method of key component of reinforced structure and construction measure of connection node are presented.The details of the method are listed in the paper,and an actual instance of post-earthquake reinforcement is cited as illustration of the method.It is relatively convenient that the energy dissipation design method based on performance-demand is used as retrofit design of post-earthquake building.By using energy dissipation braces,seismic performance of the weak stories of the structure may be greatly improved and evaluation of reinforcing effect is clearer.Hybrid energy dissipation braces system has relatively better performance-price ratio.The analysis result shows that the configuration of dampers in the structure is more reasonable by means of this method,and energy dissipation capacity of dampers can be brought into full play in low-level earthquake,middle-level intensity earthquake and high-level earthquake.By using the retrofit measure of energy dissipation braces,the reinforcement workload can be reduced and the original structure is less affected.This makes it easy to dissipate the earthquake energy as soon as the earthquake wave comes,and to cut the first major response peak.

关 键 词：抗震加固 黏滞阻尼器 防屈曲耗能支撑 消能减震设计 

分 类 号：TU352.102[建筑科学—结构工程]