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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.

大量的抗剪钢筋可以提高钢筋混凝土构件的抗剪承载力和延性。然而，过度使用钢筋会在可施工性和经济性方面产生反作用。本研究的主要目的是探讨如何控制纵向钢筋的粘结可以提高抗震性能，如剪切强度和延性的钢筋混凝土结构。在这项研究中进行了广泛的实验和分析调查。实验研究采用了15个300 × 300 mm方形RC柱，在反复循环荷载下进行试验。柱有六种不同的粘结条件，从使用普通变形钢筋的完美粘结到完美未粘结。其他测试变量包括剪跨深度比，剪切弯曲强度比，和非粘结区的长度。试验结果表明，通过降低纵筋的粘结强度，可以使极限状态下的破坏模式由剪切破坏转变为弯曲破坏。试验结果还表明，与普通钢筋混凝土柱相比，粘结控制钢筋混凝土柱具有更好的抗剪强度和延性。通过三维非线性有限元分析，验证了控制纵筋粘结对钢筋混凝土桥墩抗震性能的提高。提出的分析方法被发现，以模拟整体滞回性能和破坏模式的无粘结钢筋混凝土桥墩产生良好的相关性与试验结果。