Seismic Design System of RC Structures Based on Performance Check

(1)将钢筋混凝土双向裂缝本构模型改进为四向一裂缝。对含三个或三个方向裂纹的圆柱体试件进行了循环剪切加载试验。将结构体积分为钢筋混凝土区和素混凝土区，将双向足筋板的混凝土张拉加劲模型推广到包括局部配筋在内的所有结构中。通过对不同尺寸的柱的试验，直观地验证了钢筋混凝土受剪区是保护层混凝土的两倍。最后利用该值进行了三维非线性分析，可以进行考虑尺寸效应的抗剪承载力估计和在大范围损伤场中的抗震性能评价。(3)从场地、土体、…输入地震波预报系统更多的基地和震中已基本建立。利用该方法和三维非线性分析方法，对兵库县南部地震中钢筋混凝土框架铁路结构进行了损伤分析，通过实际损伤与分析结果的比较，验证了分析结果的可靠性。结果表明，三维分析是掌握钢筋混凝土结构抗震性能的必然要求，材料强度的评估对于包括剪切破坏在内的损伤分析具有重要意义。(4)针对既有钢筋混凝土结构，提出了预埋钢筋和粘钢加固施工方法，并对其效果进行了试验研究。钢筋板锚固方法的发展已成为梁柱连接部位负弯矩加固的重要课题。通过实际尺寸的试验，对弯矩承载力进行了校核。结果表明，在保持原有结构形式的情况下，可将承载能力提高30%。较少

(1) Reinforced concrete constitutive models considering cracks in two directions have been p Improved for the one in four directions. Cyclic shear loaded experiments of cylinder specimens with cracks in three or (our directions have been conducted. Comparing between experimental and analytical results, accuracy of the constitutive models has been proved.(2) Dividing structure volume into reinforced concrete zone and plain concrete zone, concrete tension-stiffening model for panels with sufficient rebars in two directions has been extended for all structures including localized arrangement of rebars. It is visually verified that reinforced concrete zone for shear is double of cover concrete through experiment of columns of various sizes. Finally 3D nonlinear analysis with this value has been conducted, estimation of shear capacity with size effect and evaluation of seismic performance in the spacious damage field can be done.(3) Input seismic wave predicting system from location, soil, … More base and the seismic center has been established nearly. Using this and 3D nonlinear analysis, damaged analysis of RC framed railway structures in Hyogo-ken Nanbu Earthquake has been conducted in order to check the reliability through comparison between real damages and analytical results. As a result, it is verified that 3D analysis is inevitable to grasp the seismic behaviors of RC structures and that evaluation of achieved material strength is important for damaged analysis including shear failure.(4) As flexure retrofitting construction methods for existing RC structures, embedded retrofitting bars and bond of steel plate have been developed and the effectiveness has been investigated experimentally. Development of anchor method of retrofitting bar or plate has become an important subject for negative moment at connection part of beam and column. Moment capacity has been checked through experimental with real size. As a result, it is verified that the capacity can be increased 30% keeping the former structural form. Less