轻型钢木混合楼盖水平荷载转移性能

Light Wood steel Hybrid Diaphragm’s Performance on Transferring Horizontal Loads

摘要:

通过水平集中荷载作用下一层两跨的钢木混合结构拟静力试验，研究轻型钢木混合楼盖弹性状态下平面内刚度及其对水平荷载的分配.为了量化楼盖平面内刚度对水平荷载分配的影响，定义了楼盖水平荷载转移能力系数β，探讨了楼盖平面内刚度与竖向抗侧力构件抗侧刚度比值α与β的关系，并根据α及β数值大小定义刚性楼盖.试验结果表明，轻型钢木混合楼盖在仅铺设SPF (云杉松木冷杉)规格材面板且竖向抗侧力构件仅为钢框架时，α在0.5~1.0之间，β为64.0%左右，楼盖已能较好地分配水平荷载；铺设水泥砂浆面层后，α增至3.0以上，β增至90.0%左右，结构有很强的空间协同作用，楼盖为刚性楼盖；当竖向钢框架间加上轻型木剪力墙后，α下降至1.0~2.0之间，β下降至78.0%左右，楼盖不再为刚性.

Abstract:

Studying the diaphragm’s in plane stiffness and its capacity on transferring horizontal loads in elastic phase, the detail of pseudo static experiment was described about a one story two span timber steel hybrid structure with light wood steel diaphragm under concentrated horizontal force. In addition, for quantifying the influence of in plane stiffness on horizontal load distribution, horizontal load transfer ability factor β was defined and the relationship of it with α discussed, which was the ratio of diaphragm’s in plane stiffness to vertical resist element’s anti resistance stiffness. Moreover, rigid diaphragm was classified according to their value. The result shows that in the case of it lays only SPF (Spruce Pine Fir) dimension lumber upon and the vertical resisting element containing barely steel frame, the diaphragm is already capable of distributing horizontal load well and α in the range of 0.5~1.0 and β about 64.0%; When α increases over 3.0 and β rises to around 90.0%, structural spatial cooperation is perfect and the diaphragm is converted to be rigid after paving cement mortar coat on it; Ultimately the diaphragm is no longer be rigid as α reduces within 1.0~2.0 and β drops to 78.0% if the light frame shear walls are installed in the vertical steel frame.