高应力率下混凝土动态黏结性能试验技术与数据处理方法

发布时间：2018-03-06 11:38

本文选题：霍普金森压杆　切入点：高应力率　出处：《振动与冲击》2017年18期 　论文类型：期刊论文

【摘要】：在分离式霍普金森压杆装置基础上开发了一套钢筋与混凝土动态黏结性能试验加载装置;该装置由反力框、承力装置及固定支座等组成,该装置能够实现高应力率下钢筋与混凝土的黏结性能试验。利用该装置对冲击气压为1.0 MPa,混凝土强度分别为C30,C40和C50的3组共15个试件进行动态拔出试验;试验结果发现:黏结应力率越高,钢筋与混凝土之间的极限黏结强度越大,且达到极限黏结强度对应的滑移量越小;混凝土强度越大,极限黏结强度增大,但极限黏结强度对应的滑移量无明显变化。得出了合理的试件安装、荷载施加、数据采集和处理方法,最终形成了规范的动态黏结性能试验操作步骤,并得到了高应力率下黏结应力-滑移全过程曲线。
[Abstract]:On the basis of split Hopkinson pressure bar device, a set of dynamic bonding performance test loading device for steel bar and concrete is developed, which is composed of reaction frame, bearing device and fixed support, etc. The device can be used to test the bonding performance of steel bar and concrete under high stress rate. Dynamic pull-out tests were carried out on three groups of specimens with impact pressure of 1.0 MPA and concrete strength of C30 C 40 and C 50 respectively. The experimental results show that the higher the bond stress ratio is, the greater the ultimate bond strength is between steel and concrete, and the smaller the slip corresponding to the ultimate bond strength is, the greater the concrete strength is, the greater the ultimate bond strength is. However, the slippage corresponding to the ultimate bond strength has no obvious change. A reasonable method of specimen installation, load application, data acquisition and processing is obtained, and the standard operation procedure of dynamic bonding performance test is finally formed. The whole process curve of bond stress-slip under high stress rate is obtained.
【作者单位】：河海大学土木与交通学院;
【基金】：国家重点研发计划资助项目(2017YFC0404902) 国家自然科学基金(51479048)
【分类号】：TU528

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