中间柱式黏滞阻尼器同跨内布置位置对减震效率的影响研究

Research on influence of arrangement position of middle column viscous dampers in same span on damping efficiency

为了研究中间柱式黏滞阻尼器在框架结构同一跨内不同位置布置时对减震结构减震效率的影响,通过理论分析,将阻尼器位移分解为楼层剪切变形、梁柱节点转动位移和支撑阻尼器上柱或下柱自身变形三方面,并对同跨内不同布置位置下阻尼器的层间位移利用率进行分析;通过对单层和三层钢框架开展振动台试验,验证理论分析的正确性;将研究成果应用于工程实例中,进一步分析布置位置对减震效率的影响。研究结果表明:减震效率与阻尼器布置位置关系密切,与阻尼器位于梁跨度的1/6相比,位于梁跨度的1/2时,层间位移利用率增大15%~25%,附加阻尼比增大10%~30%,顶点位移或楼层位移减小5%~15%,基底剪力或楼层剪力减小5%~15%。

In order to investigate the influence of the placement of middle column viscous dampers in frame structures at different locations within the same span on the damping efficiency of structures.Through theoretical analysis,the displacement of the damper was decomposed into three aspects:floor shear deformation,beam-column joint rotational displacement,and deformation of the upper column or lower column supporting the damper.The inter-story drift utilization ratio of dampers at different placement positions within the same span was analyzed.Shaking table tests of single-story and three-story steel frame structures were conducted,in order to validate the correctness of the theoretical analysis.Applying research findings to engineering instances,the impact of layout positions on damping efficiency was further analyzed.Experimental research results indicate that the damping efficiency is closely related to the placement position of the damper,and when the damper is located at 1/2 of the beam span compared to 1/6 of the beam span,the inter-story drift utilization ratio increases by 15%-25%,the additional damping ratio increases by 10%-30%,the top displacement or floor drift decreases by 5%-15%,and the base shear or floor shear decreases by 5%-15%.