Hysteretic cyclic response of concrete columns reinforced with smooth bars
Hysteretic cyclic response of concrete columns reinforced with smooth bars
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光筋混凝土柱的滞回循环响应
DOI：
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发表时间：
2013
影响因子：
4.6
通讯作者：
G. Manfredi
中科院分区：
文献类型：
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作者：
K. K. Arani;M. Marefat;M. Ludovico;A. Prota;G. Manfredi
自20世纪70年代以来，光滑(素)筋在钢筋混凝土(RC)建筑中的应用已被摒弃，然而，世界上许多旧的钢筋混凝土建筑都是以这种旧形式建造的，根据现行抗震加固规范的要求，这些建筑现在需要进行结构抗震修复。本文研究的重点是光杆钢筋混凝土柱的滞回循环反应。文中给出了六根柱试件在两种不同水平的轴向荷载作用下，不同的纵筋搭接细节的试验结果。通过对试验观测和试验结果的分析，试图从抗震评估的角度阐明光滑筋钢筋混凝土柱的滞回反应的主要方面。对柱的滞回力-位移反应进行了深入研究，提出了解释滞回反应旗形形式的新概念。此外，利用一种新的公式对柱的摇摆响应进行了预测，该公式假定柱体内部存在内部受压支撑，这是由于高基转角引起的摇摆。最后，提出了一个简单的滞回准则，它是考虑两个弹簧平行组合的结果，以提供总的滞回响应，即摇摆滞回反应和底部锚(光杆)滞回反应的总和。
The application of smooth (plain) bars in reinforced concrete (RC) construction has been abandoned since the 1970s; however, there are many old reinforced concrete buildings in the world whose construction is based on this old style that are now in need of structural seismic rehabilitation according to the requirements of present day seismic rehabilitation codes. The focus of this study concerns the investigation of the hysteretic cyclic response of RC columns with smooth bars. The results of six column specimens having a variety of details for overlapping splices of longitudinal bars while experiencing two different levels of axial loads under cyclic loading reversals are presented. Through analysis of test observations and the obtained experimental results, it is attempted to clarify major aspects of hysteretic response for RC columns with smooth bars, from a seismic assessment point of view. The hysteretic force–drift responses of columns are deeply investigated and a new concept explaining the flag shape form of the hysteretic response is presented. Furthermore, the rocking response of columns is predicted with a new formulation that assumes an internal compression strut inside the column body as a consequence of rocking that originated from high base rotations. Finally, a simple hysteresis rule is proposed which is the result of considering the combination of two springs in parallel to provide the total hysteretic response as the summation of rocking hysteretic and bottom anchor (smooth bar) hysteretic responses.