权益分类	功能权益	普通用户	{{item.name}}会员
{{category.name}}	{{benefitItem.name}}

Study on reinforcement methods for enforcrment of sbear strengrh and improvement of ductility ofoiers made of reinforced concrete

增强钢筋混凝土抗拉强度和提高延性的加固方法研究

基本信息

批准号：
07650552
负责人：
SHIOI Yukitake
金额：
$ 1.47万
依托单位：
HACHINOHE INSTTUTE OF TECHNOLOGY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1995
资助国家：
日本
起止时间：
1995 至 1997
项目状态：
已结题

项目摘要

There occured many collapes of reiforcd concrete (RC) stru in the 1994 Far-Off Sanniku and the 1995 Hyougoken-Nanbu Earthquakes.To protect people inside of structures and keep their least functions, it is requested that RC structures shall maintain sbear resistance ststaining their shapes and the minimum residual strength even against seismic force more than the design load.These structures shall be able to use emergency after after temporary repair. This study aims enforcement of shear strength and improvement of ductility, of columns mainly in RC structures, to reply the above-mentioned.To compare the effect of different reinforcements and to devise rational arrangements, reinforced models of circular (phi150mm, h300mm), square (133 x 133mm, h 300mm) and rectangular (188 x 98mm, h 300mm) columns are prepared for compression test.Their specified strength of concrete is 280kgf/cm^2 and W/C is 55%.The diameters of main and hoop bars are 6mm and 3mm As results, aithough the maximum loads and residual sltenhths of the models are the stronger, the more hoop bars, each strength goes down suddenly after the maximym load.But in case of the rectangular columm, hoop bars are less effectixe and spiral arrangement is better.The stirrup shall be firmly connected with main axial bars.The double bar cage shows excellant behavior of the strength after the maximum load and the residual strength.Diagonal arrangement and a group of axial bars are also effective. Is is concluded that the reinforcement to shear force shall be firmly connected within square surrounding the main axial bars and a double cage or a group of axial bars prefabricated, shall be effective and economical at site.

1994年远山地震和1995年玄武-南部地震中，钢筋混凝土(RC)结构多次倒塌，为保护建筑物内人员的安全，保持其最小的功能，要求钢筋混凝土结构在超过设计荷载的情况下，仍应保持其形状的抗力和最小剩余强度。这些结构经临时修复后，应能应急使用。为了比较不同配筋方式的加固效果，并设计合理的配筋方案，本文分别对圆形(phi150 mm，h 300 mm)、方形(133 x 133 mm，h 300 mm)和矩形(188 x 98 mm，h 300 mm)柱进行了抗压试验。其混凝土强度为280kgf/cm~2，W/C为55%。主箍直径分别为6 mm和3 mm，虽然模型的最大荷载和残余拉力较大，但箍筋较多。强度在最大荷载后突然下降，但对于矩形柱，箍筋的作用较小，螺旋布置较好；箍筋应与主轴向筋牢固连接；双筋保持架在最大荷载后表现出良好的强度和剩余强度性能；对角布置和一组轴筋也是有效的。结果表明，抗剪钢筋应在主轴筋周围的正方形内牢固连接，现场预制双笼或一组轴筋是有效且经济的。