Development of Economical Method of Construction for Seismic Reinforcement of old RC Buildings inluding Renewal of Facade Design

本研究的关键技术为单筒型和带内加劲筒的筒中筒型FLD构件的开发，主要通过实尺寸试验进行。并对钢筋混凝土框架与采用FLD构件的格构式钢框架的连接进行了试验。根据研究结果，对实际的旧钢筋混凝土建筑进行了加固和更新，取得了很好的效果。试验、分析和改造方案的主要结果如下：1）通过采用合适长度的低屈服点端管，获得了较大的轴向变形和稳定的滞回线。2)DYNA 3D和NlKE 3D可以成功地应用于FLD构件的模拟。2）为了获得更大的塑性变形和足够稳定的滞回线，在中间筒体中嵌入加劲肋是非常有效的，在假定普通钢筋混凝土结构的情况下，带加劲肋的FLD构件实现了1/100-1/150弧度的层间位移角。对带内加劲筒的筒式FLD构件进行了试验研究，并提出了设计方法。提出了钢筋混凝土框架与格构式钢框架连接的设计方法。5）通过FLD构件在某高校教学楼抗震加固工程中的实际应用，分析了FLD构件在抗震加固中的作用机理，并对FLD构件的抗震性能进行了分析。该系统实现了划时代的低成本/性能比，因为施工周期短，建筑立面美观。

The development of single tube type and tube-in-tube type with inner stiffening tube FLD member that are the key technologies of this study was carried out mainly by the full size tests. And the connection between RC frame and the latticed steel frame with FLD members was tested. Based on the results of this study, actual old RC building was reinforced and renewed very successfully. Main results obtained from the experiments, analysis and the renewal project are as follows ;1) By using suitable length of end tubes with low yield points, considerable axial deformation and stable hysteresis loop were obtained. 2) DYNA 3D and NlKE 3D are successfully applicable for the simulation of the FLD members.2) For obtaining larger plastic deformation and enough stable hysteresis loop, stiffeners inlayed into intermediate tube are very effective and the FLD member with stiffeners realizes the story-drift angle of 1/100-1/150 radian in assuming the ordinary RC buildings.3) The tube-in-tube type FLD members with inner stiffening tube were tested and the design method was developed. Considerable cost-cut was realized in case of using FLD members in outdoor because of ease of surface treatment.4) The design method of the connection between RC frame and the latticed steel frame was developed.5) By the practical application of FLD members to the University building in order to reinforcing against earthquake, this system realized the epoch-making low cost/performance ratio because of short construction period and aesthetic appearance of the building facade.