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——单管型和内加劲管型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带FLD构件的网架的连接进行了试验。在此基础上，对实际老旧钢筋混凝土建筑进行了较为成功的加固和更新。通过实验、分析和更新方案得到的主要结果如下：1)采用适当长度的低屈服点端管，可获得较大的轴向变形和稳定的磁滞回线。2) DYNA 3D和NlKE 3D成功地应用于FLD构件的仿真。2)为了获得较大的塑性变形和足够的稳定滞回线，中间筒内嵌加劲筋是非常有效的，加劲筋的FLD构件在普通钢筋混凝土建筑中实现了1/100-1/150弧度的层间漂移角。3)对带内加劲管的筒中筒型FLD构件进行了试验研究，提出了设计方法。由于易于表面处理，在室外使用FLD构件可大大降低成本。4)提出了钢筋混凝土框架与网架连接的设计方法。5)通过FLD构件在大学建筑抗震加固中的实际应用，实现了建筑工期短、建筑立面美观的低性价比，具有划时代意义。

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.