DEVELOPMENT OF SEISMIC PERFORMANCE FOR REINFORCED CONCRETE MEMBERS WITH EARTHQUAKE-RESISTANT STEEL BAR

土木工程、建筑与机械工程系的一群教职员工正在从不同的研究方面研究一个共同的主题--改善结构抗震性能的研究项目。在该方案中，考虑了几个决定主筋力学性能的系数对钢筋混凝土构件塑性铰形成过程中地震耗能的影响。(1)发展更具延性的抗震性能材料涉及到下一步：将0.2%的保证应力设定为约100-150 Mpa，将拉应力设定为400 Mpa，将伸长率设定为30%或更大。对为本研究生产的几十种合金进行了拉伸试验。选择了Fe-4Ni-14Cr-24Mn合金作为候选材料。这种钢已经达到了半生产热度。热轧和退火板的抗拉强度为448 Mpa，延伸率为28%。(2)介绍了用抗震钢板制作钢柱的试验结果。试验研究了锥形板型线、锥度比、加劲肋刚度和锥形加劲肋等因素对加劲肋性能的影响。剪切型抗震装置的强度和延性有待进一步研究。(3)研究证实，设置抗震钢筋的钢筋混凝土构件的耗能能力随着抗震装置的增加而大大提高。通过对某既有钢筋混凝土构件进行抗震加固后的抗震性能试验，验证了加固的适用性。

A group of faculty member of the department of Civil Engineering, Architecture and Mechanical Engineering is now studying on a common theme “Research Project on Improvements in Seismic Performance of Structures" from various aspect of research. In this project, the influence which a few coefficients determine a mechanical performance of main bars do to earthquake energy consumption in formation of the plastic hinge of RC members was considered. Then Earthquake-Resistant Steel have been developed in this group.(1) The development of more ductile materials for the seismic performance involves next steps : Set 0.2% proof stress to about 100-150MPa, tensile stress to 400MPa, and elongation to 30% or greater as target values for the material. Tensile tests were carried out on several tens of several alloys produced for this investigation. Fe-4Ni-14Cr-24Mn alloy was selected as a suitable candidate. A semi-production heat of this steel was made. Hot-rolled and annealed steel plate exhibited 0.2% proof stress of 118MPa, tensile strength of 448MPa and elongation of 28%.(2)Experimental results of steel columns fabricated using Earthquake-resistant steel plates are presented. The experiments have been conducted to investigate the effects of mold line of taper plates, tapering ratio, stiffeners rigidity, and tapered stiffeners. Further studies are needed for improved strength and ductility of shear-type seismic devices.(3) It is confirmed that the energy dissipation of RC members with Earthquake-resistant steel bars increased greatly as seismic devices. The seismic performance on a existing building, adopted the seismic retrofit using the present RC member, are preformed to show the applicability of it's reinforcement.