多层高强钢组合K形偏心支撑钢框架抗震性能研究

发布时间：2018-06-20 14:20

本文选题：K形偏心支撑钢框架 + 高强钢　；参考：《土木工程学报》2015年10期

【摘要】：高强钢组合偏心支撑是指耗能连梁采用普通钢材(Q345),而框架梁、柱等非耗能构件采用高强度钢材(Q460)的偏心支撑结构,这种结构体系不仅有效降低了构件截面,而且有助于高强度钢材的应用推广。为了研究其抗震性能,对1∶2缩尺比例的三层高强钢组合K形偏心支撑钢框架整体试件进行了低周往复加载试验,耗能连梁均为剪切屈服型。试验结果表明:高强钢组合K形偏心支撑结构具有较高的承载能力、良好的位移延性和耗能能力,二层耗能连梁的腹板受剪撕裂是试件破坏的标志,导致整体结构的承载力下降。试件最终破坏时,非耗能构件基本处于弹性受力状态,耗能连梁的弹塑性变形消散了大部分地震能量。另外,高强钢组合K形偏心支撑结构的延性指标受耗能连梁长度(e)与框架梁长度(L)比值影响,也与耗能连梁的转动能力有关,e/L越大,耗能连梁越接近于弯曲破坏,延性性能越好。
[Abstract]:The eccentricity bracing of high strength steel combination is the eccentrically braced structure in which the energy dissipation beam adopts ordinary steel Q345m, while the frame beam, column and other non-energy dissipation members adopt high strength steel Q460). This kind of structural system not only reduces the section of the member effectively, It is also helpful to the application and popularization of high strength steel. In order to study the seismic behavior of the composite K-shaped eccentrically braced steel frame with three layers of high strength steel at 1:2 scale ratio the low cycle reciprocating loading test was carried out. The energy dissipation beams were of shear yield type. The test results show that the high strength steel composite K-shaped eccentric bracing structure has high bearing capacity, good displacement ductility and energy dissipation capacity, and the shear tear of the web of the two-story energy-dissipation beam is the sign of the failure of the specimen. The bearing capacity of the whole structure decreases. When the specimen is finally destroyed, the non-energy dissipation member is basically in an elastic state, and the elastic-plastic deformation of the energy-dissipating beam dissipates most of the seismic energy. In addition, the ductility index of K-shaped eccentrically braced structures with high strength steel is affected by the ratio of energy dissipation beam length (E) to frame beam length (L), and it is also related to the rotation ability of energy dissipation beam, the larger the energy dissipation beam is, the closer the energy dissipation beam is to bending failure. The better the ductility.
【作者单位】：西安建筑科技大学;
【基金】：国家自然科学基金(51178382)
【分类号】：TU352.11;TU391

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