地震作用下钢筋混凝土悬臂梁抗弯性能及尺寸效应试验研究  

Tests for flexural behavior and size effects of RC cantilever beams subjected to seismic loads

作　　者：金浏[1] 苏晓[1] 李冬[1] 杜修力[1] 

机构地区：[1]北京工业大学城市与工程安全减灾省部共建教育部重点实验室,北京100124

出　　处：《振动与冲击》2017年第13期19-26,共8页Journal of Vibration and Shock

基　　金：国家自然科学基金创新研究群体(51421005)

摘　　要：随着建筑结构尺寸的不断增大,准确的预测地震荷载作用下钢筋混凝土梁抗震性能及抗弯强度随构件尺寸增大的变化趋势对评估结构的安全性具有重要的意义。设计了剪跨比为4的5组几何相似的钢筋混凝土悬臂梁,对其在低周往复荷载作用下的抗弯性能进行试验研究,旨在探讨悬臂梁的破坏模式、延性、耗能能力,刚度退化及抗弯强度等与构件尺寸的关系。研究表明:(1)不同尺寸梁的破坏模式基本相同,均在梁的固定端发生累积压缩破坏;(2)随着梁尺寸增加,其延性有所增强,但耗能能力及刚度退化性能基本相同;(3)低周往复荷载作用下梁的名义抗弯强度存在明显的尺寸效应;(4)Bazant尺寸效应理论能较好的描述钢筋混凝土悬臂梁在低周往复荷载作用下的尺寸效应规律。With increase in structures, sizes,correctly predicting the varying trend of aseismic performance and anti-bending strength of reinforced concrete （RC） cantilever beams under seismic loads is of great importance to assess the safety of RC frames. Here, five groups of RC cantilever beams with geometric similarity and a shear span ratio of 4 were designed and tested under low cyclic loading. The relationships between beams ’ sizes and their mechanical behaviors including failure pattern, ductility, energy-dissipating capacity, stiffness degradation and bending-bearing capacity were explored. The results indicated that （T） the failure patterns of all the tested RC beams with different structural sizes are similar, all the beams damage at the fixed end due to cumulative compressions;② with increase in beams ’ sizes, their ductility increases, but their energy-dissipating capacity and stiffness degradation do not change; ？ there are obvious size effects for the nominal anti-bending strength of these RC beams under low cyclic loading;④ the size effects of RC cantilever beams under cyclic loading can be described well using Bazant size effect theory.

关 键 词：钢筋混凝土悬臂梁 低周往复荷载 抗震性能 抗弯强度 尺寸效应 

分 类 号：TU528[建筑科学—建筑技术科学]