高强钢组合Y形偏心支撑框架抗震性能混合试验研究

HYBRID TESTS ON THE SEISMIC BEHAVIOR OF HIGH-STRENGTH STEEL COMPOSITE Y-ECCENTRICALLY BRACED FRAMES

高强钢组合Y形偏心支撑框架作为一种新型结构体系,结合了高强钢承载力高和偏心支撑耗能能力强的优势。为进一步研究高强钢组合Y形偏心支撑框架结构的抗震性能,以一个3层3跨的高强钢组合Y形偏心支撑框架结构为原型,采用子结构混合试验方法进行了一系列试验研究。选取原型结构中底层带有偏心支撑的框架部分作为试验子结构,其余部分作为数值子结构在OpenSees中进行模拟,从而建立了试验所需的子结构混合试验模型。根据试验结果,验证了混合试验模型的有效性,并对混合模型的主要抗震性能指标进行了分析。结果表明,在不同地震波作用下,混合试验模型的试验结果与整体结构数值模型的模拟结果吻合较好。在罕遇地震作用下,试验子结构的塑性变形主要产生在消能梁段的腹板位置,而框架的梁柱和支撑保持在弹性范围内,符合结构多道抗震设防的思想。

As a novel structural system,the high-strength steel composite Y-eccentrically braced frame(Y-HSSEBF)combines the advantages of the high strength of high-strength steel and the large energy dissipation capacity of the eccentrically braced frame.To investigate the seismic performance of Y-HSS-EBF structures,a series of substructure hybrid tests were conducted with a three-story three-span Y-HSS-EBF as the prototype.The bottomstory steel frame with Y-eccentric brace of the prototype was taken as the experimental substructure,and the rest of the prototype was taken as the numerical substructure in OpenSees to establish the substructure hybrid test model.According to the hybrid test results,the validity of the hybrid test model was verified,and the main seismic performance indexes of the hybrid test model were analyzed.The results show that during different earthquakes,the test results of the hybrid test model were in good agreement with the numerical simulation results of the global structure.During a seldom earthquake,the plastic deformation of the experimental substructure mainly occurred at the web of the link,whereas the beam-columns and braces of the experimental substructure remained in the elastic domain,which conformed to the concept of multi-aspect seismic fortification.