胶合木-混凝土组合梁与木柱组合体抗震性能试验研究

木-混凝土组合楼盖已经得到了广泛的应用,但在木结构节点设计中一般均忽略混凝土楼板对节点受力性能的影响。为研究混凝土楼板的组合作用和混凝土板内纵向钢筋配筋率对胶合木-混凝土组合节点抗震性能的影响，对3个胶合木-混凝土组合梁与木柱组合体和1个胶合木梁柱组合体试件进行了低周反复加载试验，研究了试件变形特征与破坏模式、荷载-位移滞回曲线、骨架曲线及组合梁界面相对滑移等的变化规律，探讨了试件承载力、刚度退化及耗能能力等抗震性能指标，并对比分析了纯木与带有混凝土楼板的试件的抗震性能。研究结果表明，胶合木梁与混凝土板的组合作用能显著提高试件的承载力和耗能能力等，且混凝土板对节点的约束作用可以有效抑制其刚度退化；在一定范围内，混凝土板配筋率越大，其对节点的约束作用越大，对刚度退化的抑制作用也越强，从而可有效提高试件的抗震性能。

Experimental study on seismic performance of subassemblages between glulam-concrete composite beam and glulam column

Timber-concrete composite floor has been widely used, but the effect of concrete floor on the mechanical behavior of joints is generally ignored in the design of joints in timber structures. In order to investigate the seismic behavior of joints between glulam-concrete composite beams and glulam column by considering the composite action of concrete slabs and the effect of longitudinal reinforcement ratio, three subassemblages between glulam-concrete composite beams and the glulam column and one glulam beam-column subassemblage were tested under low cyclic reversed loading. The deformation characteristics, failure modes, load-displacement hysteretic curves, skeleton curves and relative slip at interface of the composite beam were studied. The seismic performance of specimens were discussed in terms of bearing capacity, stiffness degradation, energy dissipation capacity. The seismic performances of glulam beam-column with and without consideration of the influence of RC slab were compared and analyzed. The results show that the composite action of glulam beam and concrete slab can significantly improve the bearing capacity and energy dissipation capacity of the subassemblage, and the constraint effect of the concrete slab can effectively restrain the stiffness degradation of the joints. In a certain range, the restraining effect on the joints and the restraining of stiffness degradation can be increased by the increase of the reinforcement ratio of concrete slabs, which can effectively improve the seismic performance of the subassemblage.