建筑隔震橡胶柔性管道抗震性能试验研究

EXPERIMENT STUDY ON SEISMIC PERFORMANCE OF RUBBER FLEXIBLE PIPES FOR SEISMICALLY ISOLATED BUILDINGS

橡胶柔性管道在隔震建筑中逐渐得到应用,其震后能否正常工作会直接影响建筑的使用功能。该文选取竖向安装的橡胶柔性管道作为研究对象,变形位移需求为400 mm,考虑2种公称内径和4种管道设计长度影响,进行了抗震性能试验,对比分析了该类管道的地震损伤演化模式、变形和承载能力特征。试验结果表明:设计长度较小的管道均无法满足预期变形目标,经历管道绷直以及单侧断裂破坏两个关键状态,震后必须更换;对于设计长度符合规范建议的管道,则可以满足变形需求;回归分析获得了管道公称内径和设计长度与其水平变形能力之间的量化关系;管道设计长度相同时,管道公称内径与其破坏时的水平极限荷载呈正相关关系,但大公称内径和小公称内径管道的极限水平荷载之比小于公称内径比。

Rubber flexible pipes have been increasingly used in seismically isolated buildings.Whether it could work normally after the earthquake directly affects the function of the building.The vertical rubber flexible pipeline is selected as the research object.Base on the deformation requirement of 400 mm,the seismic performance test is carried out considering the influence of two nominal inner diameters and four different design lengths.The seismic damage evolution model,deformation and bearing capacity characteristics of this type of pipeline are compared and analyzed.The test results indicate that:The pipes with smaller design length cannot meet the expected deformation target.Such pipes experienced two key states:pipe stretching and single-sided fracture.And such pipes must be replaced after the earthquake;For pipes with a design length consistent with the code recommendations,deformation requirements can be met;The quantitative relationship between the nominal inner diameter and design length of the pipeline and its horizontal deformation ability was obtained through regression analysis;For pipes with an identical design length,the nominal inner diameter of the pipeline and the horizontal ultimate load at the time of failure are positively related.Meanwhile the ratio of ultimate load for the pipe with a large and small nominal internal diameter is smaller than the ratio of correspond inner diameter.