Formulation of Load Deflection Relations of Steel Concrete Composite Columns

本研究的目的是制定荷载-位移关系，可以评估局部屈曲极限，收缩极限的情况下，钢管混凝土柱，裂缝发生极限和初始屈服极限的情况下，型钢混凝土柱和梁。至于混凝土填充柱，津田调查经验侧移角和剩余的钢管混凝土柱的关系。结果表明：（1）残余位移角随轴压比的增大而增大;（2）与轴压比相比，宽厚比和径厚比对残余位移角的影响不明显;（3）高轴压比试件在达到收缩极限后残余位移角增大;使用先前执行的测试来计算累积塑性角。选取收缩极限、局部屈曲极限、强度保证极限作为准则，考察了宽厚比、径厚比和轴压比等参数的影响。Fujinaga和Tsuda利用试验和数值分析研究了钢管混凝土压弯构件的循环和单调性能之间的关系。对于SRC梁，Sakai和Lee进行了试验研究，试验参数为外包钢率和板的存在。Sakai检查了载荷挠度关系。

The objective of this study is to formulate the load-displacement relationship which can evaluate the local buckling limit, shrinkage limit in case of CFT columns, crack occurrence limit and initial yield limit in case of SRC columns and beams.As to the concrete filled columns, Tsuda investigated relation between experienced lateral drift angle and residual one of concrete filled steel tubular columns. As the results, 1) residual drift angle becomes large as the axial load ratio of the column becomes large, 2)the effect of width-thickness ratio and diameter-thickness ratio on the residual drift angle is not apparent, comparing with the axial load ratio, 3) in specimens with high axial load ratio, the residual drift angle becomes large after the column attained the shrinkage limit.Moreover, accumulated plastic angles are calculated using previously performed test. As the criterion, shrinkage limit, local bucking limit, strength assurance limit are selected, and effect of width-thickness ratio, diameter-thickness ratio and axial load ratio are examined.Fujinaga and Tsuda investigated the relations between cyclic and monotonic behavior on CFT beam-columns by using the previously performed experiment and numeric analysis. While in the small deflection stage, monotonic behavior correspond to envelop curve of cyclic behavior, in the large deflection stage, monotonic behavior correspond to accumulated curve of cyclic one.As to SRC beam, Sakai and Lee performed experimental test, selecting the encased steel ratio and existence of slab as the test parameters. Sakai examined the load deflection relationship.