可更换消能连梁抗震性能试验

Seismic Performance Experiment of Thereplaceable Energy-dissipating Coupling Beam

为了解决高层混合结构地震损伤严重的问题,对其破坏集中的位置进行消能减震设计并进行试验研究.高层混合结构在我国应用广泛,实际地震震害以及振动台试验结果表明,该类结构损伤集中在核心筒连梁.而传统的钢骨混凝土连梁在剪切变形下往往过早破坏而提前退出工作,使得地震能量进一步传递给其他结构构件最终破坏.为此,设计了跨高比为1. 8和2. 5的可更换消能连梁.考虑了楼板对承载力的影响,对于消能连梁试件,楼板上浮30 mm.通过拟静力试验研究其关键力学性能,并检验公式的合理性.结果表明,消能连梁提前进入屈服,保护了墙体免受损伤;连梁根部锚固位置的弹性变形易导致连梁初始刚度下降,建议优化该部分构造,提高整体刚度;楼板上浮以后,对连梁承载力基本没有贡献;试验结果比设计公式计算结果偏小.

To solve the problem that the high-rise hybrid structures are seriously damaged during large earthquakes, energy dissipation design was applied to the focus of damage with experimental research. High-rise hybrid structures are widely used in China, and observations of the earthquake damage and the shaking table test results reveal that the damage of structures focus on the coupling beam. However, in most cases the traditional steel-reinforced concrete coupling beam tends to fail prematurely under shear deformation, and the seismic energy further is transferred to other structural elements. For this reason, a replaceable energy-dissipating coupling beam with a span height ratio of 1.8 and 2.5 was designed. Considering the influence on bearing capacity, the floor slabs of energy dissipating coupling beams were moved up 30 mm. The mechanical properties of the beams were studied by the quasi-static test, and the rationality of the design formulas were verified. Results show that the replaceable energy-dissipating coupling beams can yield early to prevent walls from damage. The elastic deformation of the anchorage position decreases the initial stiffness of the coupling beam. Optimizing the anchorage position is suggested to improve the overall stiffness. The floor slabs of energy-dissipating coupling beams, which are moved up 30 mm, make no contribution to the bearing capacity of the coupling beams. The value of tests is less than that simulated by design formula.