高应力率下混凝土动态粘结性能试验技术与数据处理方法

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振动与冲击 ›› 2017, Vol. 36 ›› Issue (18) : 43-48.

论文

周继凯，沈大伟，潘杨

作者信息 +

Test technique and data processing method for dynamic bond behavior between steel bar and concrete under high stress rates

ZHOU Jikai SHEN Dawei PAN Yan

Author information +

文章历史 +

摘要

本文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粘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粘结性能试验。并利用该装置对冲击气压为1.0MPa，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：粘结应力率越高，钢筋与混凝土之间的极限粘结强度越大，且达到极限粘结强度对应的滑移量越小；混凝土强度越大，极限粘结强度增大，但极限粘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粘结性能试验操作步骤，并得到了高应力率下粘结应力—滑移全过程曲线。

Abstract

Based on Split Hopkinson Pressure Bar (SHPB) device, together with a reaction frame, a force bearing device and fixed supports, a loading device for testing the dynamic bond behavior between steel bar and concrete, especially under high stress rates, was developed. The dynamic pull-out tests were carried out on 15 specimens of three concrete strengths (C30, C40 and C50) under the impact air pressure of 1.0 MPa. The experimental results show that the ultimate bond strength increases and the corresponding slip decreases with the increase of bond stress rates; the ultimate bond strength increases with the increase of concrete strength but the corresponding slip has no obvious change. After conducting the tests, the suitable methods for test specimen installation, loading application and data acquisition and processing were concluded. The normative test procedure and dynamic bond stress-slip curves for the whole loading process were obtained.

导出引用

周继凯，沈大伟，潘杨. 高应力率下混凝土动态粘结性能试验技术与数据处理方法[J]. 振动与冲击, 2017, 36(18): 43-48

ZHOU Jikai SHEN Dawei PAN Yan. Test technique and data processing method for dynamic bond behavior between steel bar and concrete under high stress rates[J]. Journal of Vibration and Shock, 2017, 36(18): 43-48

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