Rational Reinforcing Method of Steel Beam to Composite Column Connections

本研究由以下两个研究项目组成。第一个研究项目是钢梁与混凝土加筋钢柱连接的结构性能，钢单元为交叉h形，并加竖向加筋板。通过模拟梁柱连接受拉侧翼缘的十字形受拉试件和不同参数组合梁柱组合试件的试验结果，提出了考虑混凝土加劲作用下钢梁通过竖向加筋板向混凝土加劲钢柱传递应力的机理。基于屈服线理论，分析提出了十字形连接和梁端连接的屈服强度和极限强度的估算公式，分析强度与试验强度具有较好的对应关系。第二个研究项目是钢梁与内隔板钢管混凝土柱连接的结构性能，内隔板钢管混凝土柱具有较大的方形或圆形开口，以保证矩形空心截面柱内填充混凝土的可行性。根据十字形拉伸试件和梁柱组合体试件的试验结果，提出了钢梁经内隔膜向钢管混凝土柱传递应力的机理。并根据屈服线理论对连接的屈服和极限强度进行了分析。根据本研究得出的估算公式，合理确定竖向加劲筋或内隔板的尺寸，可以得到结构性能优越、柱段内填充混凝土可行的钢梁与组合柱的连接形式。

This study is consisted of the following two research projects. The first research project is on the structural behavior of the connections of steel beam to concrete eneased steel column whose shape of steel element is cross-H and reinforced with vertical stiffening plates. From the test results of cruciform tensile specimens simulating the tension side flange of beam to column connections and beam-and-column subassemblage specimens containing various set of parameters, the mechanism of stress transfer from steel beam to concrete eneased steel column through vertical stiffening plates is proposed taking the effect of infilled concrete into consideration. The estimation formulae of yield and ultimate strength of both cruciform connection and beam-end-connection are proposed analytically based on the yield line theory and good correspondence between the analytical and experimental strengths can be observed.The second research project is on the structural behavior of the connections of steel beam to concrete filled tubular column reinforced with inner diaphragm which has a large square or circular opening to ensure the feasibility of infilling concrete inside the rectangular hollow section column. From the test results of cruciform tensile specimens and beam-and-column subassemblage specimens, the mechanism of stress transfer from steel beam to concrete filled tubular column through inner diaphragm is proposed. And the yield and ultimate strength of the connections are analyzed based on the yield line theory.By determining the size of vertical stiffeners or inner diaphragm properly according to the estimation formulae obtained from this study, the connections of steel beam to composite column which have superior structural performance and feasibility of infilling concrete into column section can be obtained.