Development of High Performance Seismic Members

本研究针对钢筋混凝土及型钢混凝土构件高性能结构的发展及抗震设计方法进行了研究。2002年至2004年的研究结果如下。高强混凝土梁的抗剪承载力特性进行了抗压强度为130 MPa的高强混凝土梁的抗剪承载力试验。(1)A提出了高强混凝土无粘结钢筋混凝土梁抗剪强度计算公式。(2)A参考前人的试验成果，提出了高强混凝土和钢筋混凝土梁的抗剪承载力计算公式.高强混凝土柱的单轴抗压强度特性进行了矩形和圆形截面钢筋混凝土柱的单轴抗压试验。(1)By通过对核心混凝土应变分布的测量，可以定量评价混凝土强度和拉筋数量对破坏区域的影响。(2)By利用压缩破坏能建立了普通到高强约束混凝土的应力-应变关系式.型钢混凝土柱的低周反复荷载试验及延性评价在低周反复荷载试验中，对型钢混凝土柱的荷载-挠度特性、塑性曲率分布、纵筋和H型钢的应变分布进行了测试。（1）提出了纵筋的屈曲分析模型。利用该模型，可以较好地计算钢筋混凝土柱和型钢混凝土柱的层裂位移。(2)A提出了以H型钢局部屈曲为重点的型钢混凝土柱延性评价方法。用该方法计算翼缘板的极限位移、屈曲长度和塑性长度，可以得到相同的响应。

In this study, the development and the seismic design approach of high performance structures using RC and SRC members have been done. The results of the study from 2002 to 2004 are shown below.1. Shear strength characteristic of RC beams using high-strength materialsThe shear loading tests of RC beams without stirrup using high-strength concrete of compressive strength ranging to 130MPa have been carried out.(1)A shear strength equation of RC beams without stirrup using high-strength concrete has been suggested.(2)A shear strength equation of RC beams with stirrup using high-strength concrete and reinforcing bars has been suggested by referring to the previous test results.2. Uniaxial compressive strength characteristic of RC columns using high-strength materialsThe uniaxial compressive loading tests of RC columns (rectangular and circular section) have been carried out.(1)By measuring the strain distribution of the core concrete, it is possible to quantitatively evaluate the changing of failure region caused by the concrete strength and the quantity of tie reinforcement.(2)By using the compressive failure energy, the stress-strain relationship of confined concrete of normal to high strength has been formulated.3. Reversed cyclic loading tests of SRC columns and the ductility evaluationLoad-deflection characteristics, plastic curvature distribution, and strain distribution of longitudinal bars and H-shaped steel were measured in the cyclic loading tests of SRC columns.(1)The buckling analysis model of longitudinal bars has been suggested. Using this model, it is possible to fairly evaluate the displacement at the spalling of RC and SRC columns.(2)A ductility evaluation of SRC columns focused on the local buckling of the H-shaped steel has been suggested. The same response can be obtained by using proposed method to calculate the ultimate displacement, the buckling length and plastic length of flange plate.