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

发布时间：2018-01-18 03:28

本文关键词：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　出处：《振动与冲击》2017年13期 　论文类型：期刊论文

【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。
[Abstract]:With the building structure size increasing. It is important to accurately predict the seismic behavior and bending strength of reinforced concrete beams with the increase of member size to evaluate the safety of the structure. Five sets of geometric phases with shear span ratio of 4 are designed. Like a reinforced concrete cantilever beam. In order to discuss the failure mode ductility and energy dissipation ability of cantilever beam the flexural behavior of the cantilever beam under low cycle reciprocating load is studied experimentally. The relationship between stiffness degradation, flexural strength and member size. The results show that the failure mode of beam with different sizes is basically the same, and the cumulative compression failure occurs at the fixed end of the beam. (2) with the increase of beam size, the ductility increases, but the energy dissipation capacity and stiffness degradation performance are basically the same; (3) the nominal bending strength of beams under low cycle reciprocating load has obvious size effect. Bazant size effect theory can well describe the size effect of reinforced concrete cantilever beam under low cycle reciprocating load.
【作者单位】：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;
【基金】：国家自然科学基金创新研究群体(51421005)
【分类号】：TU375.1
【正文快照】： 混凝土材料属于典型的准脆性非均质材料,大量试验及理论工作[1-4]证实了混凝土材料存在尺寸效应行为。钢筋混凝土构件是由混凝土及钢筋组成的复合材料,其力学性能取决于混凝土、钢筋及两者之间的相互作用[5-6]。大量试验工作,包括钢筋混凝土柱[7-8](轴压强度)、钢筋混凝土梁(

【参考文献】