RC梁冲击破坏机理试验研究与残余变形预测方法探讨

发布时间：2018-06-09 02:24

本文选题：钢筋混凝土梁 + 冲击试验　；参考：《湖南大学学报(自然科学版)》2017年01期

【摘要】：进行了3根剪跨比为3.58钢筋混凝土梁的落锤冲击试验和1个静力对比试验,重点研究钢筋混凝土梁在冲击荷载作用下的破坏机理和冲击能量对钢筋混凝土梁残余变形的影响规律.试验结果表明,在静力下发生弯曲破坏的梁在低速冲击下的裂缝形态以弯曲裂缝、弯剪裂缝为主,在高速冲击荷载作用下以腹剪裂缝为主.试验测试了冲击力、支座反力、跨中位移和跨中纵筋应变等动态时程曲线,通过分析其动态时程曲线结果,获得了钢筋混凝土梁的冲击破坏机理,即冲击作用下梁的破坏过程分为局部响应阶段和整体响应阶段.同时,还统计了国内外相关文献冲击试验结果,通过比较分析钢筋混凝土残余变形-冲击能量关系实验数据,探讨了冲击荷载作用下钢筋混凝土梁残余变形的经验公式的适用性和存在的问题.
[Abstract]:Three concrete beams with a shear span ratio of 3.58 are tested by drop hammer impact test and a static contrast test. The failure mechanism of reinforced concrete beam under impact load and the influence of impact energy on residual deformation of reinforced concrete beam are studied. The experimental results show that the fracture forms of beams subjected to bending failure under static load are bending crack, bending shear crack and abdominal shear crack under high speed impact load. The dynamic time-history curves, such as impact force, support reaction force, mid-span displacement and strain of mid-span longitudinal reinforcement, are tested. The impact failure mechanism of reinforced concrete beam is obtained by analyzing the results of dynamic time-history curve. The failure process of beam under impact is divided into local response stage and global response stage. At the same time, the impact test results of relevant literatures at home and abroad are analyzed, and the experimental data of residual deformation-impact energy relationship of reinforced concrete are compared and analyzed. The applicability and existing problems of empirical formulas for residual deformation of reinforced concrete beams under impact loading are discussed.
【作者单位】：湖南大学教育部建筑安全与节能重点实验室;华侨大学土木工程学院;中国葛洲坝集团勘测设计有限公司;
【基金】：国家自然科学基金资助项目(51378200,51438010)~~
【分类号】：TU375.1

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