Experimental study of precast segmental columns with unbonded tendons under cyclic loading
Experimental study of precast segmental columns with unbonded tendons under cyclic loading
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DOI：
10.1177/1369433217717119
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发表时间：
2018-02
影响因子：
2.6
通讯作者：
Chao Li;H. Hao;Xihong Zhang;K. Bi
中科院分区：
文献类型：
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作者：
Chao Li;H. Hao;Xihong Zhang;K. Bi
预制节段柱在过去的十年里引起了人们的广泛关注。实现快速施工、提高施工质量、减少对环境的影响已成为建筑行业越来越普遍的需求。影响节段柱性能的因素很多，包括消能筋、节段数、预应力和剪力键等，但以往的研究通常只关注其中的一个或两个因素。由于以往的研究采用不同的材料、不同的结构尺寸、不同的轴向荷载和不同的试验方法，很难全面比较这些参数对节段柱性能的影响。此外，有限的研究表明，剪切键的性能受到循环荷载的节段柱没有显着的影响，而其他研究表明，剪切键有助于抵抗冲击荷载，但可能会导致更严重的损伤，由于应力集中。在这项研究中，循环试验进行了系统的评估性能的节段柱。特别注意剪切键对柱反应的影响。对5个不同设计的节段柱进行了缩尺试验，研究了节段柱的破坏形态、滞回性能、残余位移和耗能能力。还测试了一个整体柱作为参考。试验结果表明，与整体柱相比，分段柱具有更好的延性和更小的残余位移，抗震性能更好，但分段柱的承载力较低，吸收的能量较少。研究了节段间耗能杆、节段数、预应力筋预应力水平、混凝土剪力键等不同设计对节段柱抗震性能的影响。
Precast segmental column has attracted a lot of interests over the past decade. It has become more and more popular in construction industry to achieve fast construction, improve construction quality and reduce environmental impact. Many factors including the energy dissipation bar, number of segments, prestressing force and shear keys could affect the performance of segmental column, but each of previous studies normally focused on investigating one or two of these factors. Since different previous studies used different materials, different structural dimensions, different axial loads and different testing methods, it is difficult to have comprehensive comparisons of the influences of these parameters on the performances of segmental columns. Moreover, limited studies indicated that shear keys had insignificant influences on performances of segmental columns subjected to cyclic loadings, while other studies revealed shear keys contribute to resisting impact loads but could lead to more severe damage due to stress concentration. In this study, cyclic tests were carried out to systematically assess the performance of segmental columns. Special attentions were paid on the influences of shear keys on column responses. Five scaled segmental columns with different designs were tested to study their damage mode, hysteretic behaviour, residual drift and energy dissipation capacity. One monolithic column was also tested as a reference. Test results showed that comparing with the monolithic column, the segmental columns exhibited better ductility and smaller residual drift, indicating better seismic performance, but segmental columns had less loading capacity and absorbed less energy. The influences of different designs including energy dissipation bar between adjacent segments, number of segments, prestressing force level in the tendon and concrete shear key on the seismic performance of segmental column were investigated and discussed.