全轻混凝土与钢筋粘结破坏的能量分析

发布时间：2018-02-08 15:49

本文关键词： 全轻混凝土月牙肋钢筋粘结破坏拉拔力-位移曲线总能耗-位移曲线　出处：《武汉大学学报(工学版)》2017年06期 　论文类型：期刊论文

【摘要】：为了探讨钢筋与全轻混凝土之间的粘结破坏机理,通过全轻混凝土与光圆钢筋和月牙肋钢筋进行的拉拔试验发现,粘结破坏只有劈裂破坏和拔出破坏2种形式;但光圆钢筋只发生拔出破坏,而且月牙肋钢筋对粘结破坏的耗能贡献率远大于光圆钢筋.其次,全轻混凝土与钢筋粘结的能量机制与普通混凝土基本一致,并以能量耗散和能量释放2种类型为主;但前者的总能耗-位移(W-S)曲线突变较为平缓,且突变点也较提前.而根据发生劈裂破坏且钢筋直径d为16、20mm时的试件,较发生拔出破坏且d为12mm时的试件,其总能耗仅为后者的19.7%和30%的结论,进一步表明当钢筋混凝土结构采用能量设计原则较传统的强度设计原则时,更加合理且更易保证结构的延性,从而有利于提高结构的抗震性能.
[Abstract]:In order to study the mechanism of bond failure between the steel bar and the whole light concrete, the pull-out test between the light weight concrete and the smooth circular steel bar and crescent rib steel bar shows that there are only two forms of bond failure: split failure and pull-out failure. Moreover, the energy consumption rate of crescent rib steel bar to bond failure is much higher than that of smooth circular steel bar. Secondly, the energy mechanism of bonding between full light concrete and steel bar is basically the same as that of ordinary concrete. The two main types of energy dissipation and energy release are energy dissipation and energy release, but the total energy-displacement W-S-) curve of the former has a gentle change, and the point of change is earlier. However, according to the specimen with splitting failure and the diameter of steel bar d being 16 ~ 20mm, The results show that the total energy consumption of the specimen is only 19.7% and 30% of the latter, which further indicates that the energy design principle of reinforced concrete structure is more than that of the traditional strength design principle. It is more reasonable and easy to ensure the ductility of the structure, which is helpful to improve the seismic performance of the structure.
【作者单位】：河南理工大学生态建筑与环境构建河南省工程实验室;河南理工大学土木工程学院;
【基金】：国家自然科学基金项目(编号:41172317)
【分类号】：TU312.3;TU375

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