防屈曲支撑混凝土框架支撑跨受力状态和设计分析

Analysis for design of brace span structure of buckling-restrained brace concrete frame

地震作为一种常见的自然灾害会造成严重的经济损失和人员伤亡。房屋建筑的严重破坏和倒塌是造成这种问题的主要原因。防屈曲支撑作为一种阻尼器能够有效减小主体结构的地震响应,近年来在混凝土结构中已应用于较多的工程实例中。然而研究表明,大震作用下,防屈曲支撑混凝土框架往往无法发挥出预期的抗震性能。基于分析防屈曲支撑混凝土框架支撑跨结构的实际受力状态,主要针对支撑跨框架梁柱提出了性能优化设计的设计建议。该设计思路主要对增设防屈曲支撑结构的受力模型进行了修正,并对其承载力设计和构造措施进行相应的调整。

An earthquake as a common natural disaster can cause serious economic losses and casualties.The severe damage and collapse of housing construction is the main reason for this problem.As a kind of damper,the buckling-restrained brace can effectively reduce the seismic response of the main structure.In recent years,it has been applied to many engineering examples in concrete structures.However,studies have shown that under the action of large earthquakes,buckling-restrained braced concrete frames often fail to exhibit the expected seismic performance.In this paper,based on the analysis of the actual stress state of the buckling-restrained braced concrete frame supporting span structure,the design recommendations based on performance-based design are mainly proposed for the supporting span frame beam and column.Based on the performance-based design idea,the stress model of the additional buckling-restrained brace structure was revised,and the design and construction measures of its bearing capacity were adjusted accordingly.