提出了一种适用于多层框架结构的新型摩擦消能减震楼梯及其构造形式.针对所采用阻尼器布置方式,提出并验证了梯段板等效四平行杆模型.采用等效线性化方法及非线性时程分析对该种楼梯在地震作用下两种性能目标进行分析和对比研究:性能目标1为楼梯内阻尼器中震起滑,小震下为结构提供抗侧抗度;性能目标2为楼梯内阻尼器在小震下起滑,起滑力为梯段板等效杆轴力水平分量的0.8倍.分析中对比了楼梯内阻尼器附加阻尼比三种等效计算方法,分析结果表明:小震下滑动耗能的性能目标2所得结构附加阻尼比为1.8％,所得结构层间剪力及层间位移均较小,更为优越;采用刚接方法计算楼梯内阻尼器附加阻尼比结果更准确,且计算量较小,可供设计人员参考.%A new-type frictionally damped staircase which is applicable in multi-story framed structures and its composition are put forward.An equivalent four parallel stick model is given and validated based on its configuration.Equivalent linearization method and non-linear time-history analysis are used to investigate and compare the following two seismic performance objectives of the staircase:for performance objective Ⅰ,dampers in the staircase begin to slide under design earthquake and provide stiffness under frequent earthquake;for performance objective Ⅱ,dampers begin to slide under frequent earthquake,and the slide resistances are assigned as 0.8 times of horizontal components of actual forces.Three equivalent calculation methods are compared in obtaining the equivalent additional damping ratio provided by the staircase.The results show that:compare to performance objective Ⅰ,performance objective Ⅱ will lead to less inter story drifts and shear forces,providing additional damping ratio of nearly 1.8％ to whole structure for multi-story framed structures.Among the methods for equivalent damping ratio,the method of rigid connection is more accurate and leads to less computational effort providing reasonable reference for designers.
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