Mitigation of Earthquake Damage of Reinforced Concrete Structures

减轻钢筋混凝土结构的地震损伤

基本信息

批准号：
14350230
负责人：
MUTSUYOSHI Hiroshi
金额：
$ 5.89万
依托单位：
SAITAMA UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
2002
资助国家：
日本
起止时间：
2002 至 2003
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-14350230/
关键词：
MITIGATION OF EARTHQUAKE DAMAGE RC STRUCTURES BOND CONTROL DUCTILITY

项目摘要

It is well known that a large amount of shear reinforcement enhances the shear capacity and ductility of RC members. Excessive use of reinforcements, however, can become counterproductive in terms of both constructability and economy. The main objective of this study is to examine how controlling the bond of the longitudinal reinforcements can improve seismic performance, such as shear strength and ductility of RC structures. An extensive experimental and analytical investigation was carried out in this study. The experimental study employed fifteen 300 x 300 mm square RC columns tested under reversed cyclic loading. The columns were of six different bond conditions, varying from the perfect bond with the use of ordinary deformed bars, to the perfect unbond. The other test variables included the shear span to depth ratio, the shear to flexural strength ratio, and the length of unbonded region. The results of the experiment revealed that the failure mode at the ultimate state could be changed from shear to flexure by reducing the bond strength of the longitudinal bars. The test results also showed that RC columns reinforced with bond controlled bars had significantly better shear strength and ductility than RC columns reinforced with ordinary bars. Three Dimensional nonlinear finite element analysis was also carried out to verify the enhancement of seismic performance of reinforced concrete bridge piers by controlling bond of longitudinal reinforcement. Proposed analytical method was found to model the global hysteretic behavior and failure mode of unbonded RC piers producing an excellent correlation with that of the experimental results.

众所周知，大量的剪切钢筋增强了RC成员的剪切能力和延展性。但是，过度使用增援部队在可施加性和经济性方面都可能适得其反。这项研究的主要目的是检查如何控制纵向增强的键可以改善地震性能，例如剪切强度和RC结构的延展性。在这项研究中进行了广泛的实验和分析研究。实验研究采用了15个300 x 300毫米平方RC柱，在反向循环载荷下测试。这些柱具有六个不同的键条件，从使用普通变形条的完美键到完美的无键。其他测试变量包括剪切跨度与深度比，剪切强度比和无粘性区域的长度。实验的结果表明，最终状态下的故障模式可以通过降低纵向杆的键强度从剪切变为弯曲。测试结果还表明，用键控制条加固的RC柱具有明显更好的剪切强度和延展性，而RC色谱柱则是普通条的加固。还进行了三维非线性有限元分析，以通过控制纵向加固的键来验证钢筋混凝土桥墩的地震性能的增强。提出的分析方法被发现对无粘性RC墩的全局滞后行为和故障模式进行了建模，从而与实验结果产生了极好的相关性。