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偏心支撑半刚接钢框架是一种新型抗震结构体系,为研究其动力特性及抗震性能,进行了4个三层空间框架试件的试验研究。动力特性测试表明,随着梁柱节点转动刚度的降低,结构自振频率减小,阻尼比增加。循环加载试验表明,节点刚度和承载力对偏心支撑框架结构的滞回性能有显著影响,节点刚度和承载力越高,滞回性能越好,节点刚度较低的偏心支撑框架不宜用于抗震设防区;偏心支撑显著增加了半刚接钢框架的抗侧刚度,使得节点刚度对框架刚度的影响减弱,但降低了结构延性;结构的塑性变形主要来自节点域、消能梁段及梁柱节点连接件;多层偏心支撑框架的侧移变形为剪切型,层间屈服位移角较大。
Eccentric brace semi-rigid welded steel frame is a new type of earthquake-resistant structural system. In order to study its dynamic characteristics and seismic performance, four three-layer space frame specimens were studied. Dynamic tests show that with the decrease of the rotation stiffness of the beam-column joints, the natural frequency of the structure decreases and the damping ratio increases. Cyclic loading tests show that the node stiffness and bearing capacity have a significant effect on the hysteretic behavior of the eccentric support frame structure. The higher the node stiffness and bearing capacity, the better the hysteretic performance and the lower node stiffness eccentric support frame should not be used for seismic fortification The eccentric support significantly increases the lateral stiffness of the semi-rigid welded steel frame, so the influence of the node stiffness on the frame stiffness is weakened, but the structural ductility is reduced. The plastic deformation of the structure mainly comes from the node domain, the energy dissipating beam segment and the beam-column node Connectors; multi-layer eccentric deformation of the lateral deformation of the shear-type frame, the layer yield a larger displacement angle.