钢骨—方钢管混凝土柱与钢梁节点抗震性能研究

发布时间：2018-05-29 22:39

本文选题：钢骨—方钢管混凝土柱 + 外加强环节点　；参考：《西安科技大学》2015年硕士论文

【摘要】：钢骨—方钢管混凝土柱是由方钢管内填充混凝土和钢骨所形成的构件,它能使混凝土和钢材发挥各自的优点,通过钢管约束混凝土和钢骨使核心混凝土的承载能力有很大程度上的提高,而在核心混凝土中填充钢骨能使得钢管不易产生局部屈曲。由于钢骨—方钢管混凝土柱与钢梁的连接表现出良好的综合性能,所以其在实际工程当中具有相当广泛的应用范围。钢骨—方钢管混凝土柱与钢梁节点也存在着诸多问题,特别是在钢骨—方钢管混凝土柱与钢梁连接的节点抗震性能还需进一步深入研究。本文考虑了外加强环的宽度(JQHK)、外加强环的厚度(JQHH)、轴压比(ZZYB)和含钢率(ZHGL)对节点抗震性能的影响。通过建立的11个有限元模型试件和计算结果,对结构在循环荷载作用下的的滞回性能、节点承载力、刚度退化、强度退化、耗能能力等进行了相对系统的分析。研究结果表明:当结构在循环荷载作用下时,其滞回曲线饱满并且呈现出纺锤形,没有表现出明显的刚度退化和捏缩现象,所以其表现出了良好的耗能能力;为了使外加强环式节点性能能更加有效的发挥,加强环板宽度在0.75倍的柱边长和1.25倍的柱边长范围内取值时为宜;当增大外加强环厚度,节点区承载力明显提高,为了使加强环受力较好并且考虑经济时,加强环的厚度应该取梁翼缘厚度相同;当钢管混凝土柱柱端轴压力的增大时,节点的承载力也会有相应提高,为了使节点耗能能力相对较好,轴压比应该控制在0.4~0.8之间;当钢管壁厚有所增加时,节点的承载力也相应得到一定提高,但是结构的耗能能力在钢管壁超过一定厚度时增加很小,为了经济期间,所以含钢率应控制在0.126~0.167之间为宜。本文深入地分析了钢骨—方钢管混凝土柱与钢梁节点的抗震性能,得出的结论为钢骨—钢管混凝土结构加强环式节点的的研究应用提供了有价值的数据和参考依据。
[Abstract]:The steel-square concrete-filled steel tube column is a component formed by the filling of concrete and steel in a square steel tube, which enables concrete and steel to play their respective advantages. The load-bearing capacity of the core concrete can be greatly improved by confined concrete with steel tube and steel bone, while the local buckling of the steel pipe is not easy to be caused by filling the steel bone in the core concrete. Because of the good comprehensive performance of the connection between concrete-filled steel tubular column and steel beam, it has a wide range of applications in practical engineering. There are also many problems in the connection of concrete-filled steel tubular column and steel beam, especially the seismic behavior of the connection between steel reinforced concrete filled steel column and steel beam needs further study. In this paper, the effects of the width of the outer stiffening ring, the thickness of the outer strengthening ring, the axial compression ratio ZZYB and the steel content ratio on the seismic behavior of the joints are considered. Based on the 11 finite element model specimens and the calculated results, the hysteretic behavior, joint bearing capacity, stiffness degradation, strength degradation and energy dissipation capacity of the structure under cyclic load are analyzed systematically. The results show that the hysteretic curve of the structure is full and spindle-shaped under cyclic load, and it does not exhibit obvious stiffness degradation and pinch phenomenon, so it shows good energy dissipation capacity. In order to make the performance of the outer strengthened ring joints more effective, it is appropriate to select the values of the width of the ring plate in the range of 0.75 times of column side length and 1.25 times of column side length, and the bearing capacity of the joint area is obviously increased when the outer strengthened ring thickness is increased. In order to make the strengthened ring bear well and consider the economy, the thickness of the strengthened ring should be the same as the thickness of the beam flange, and the bearing capacity of the joint will also be increased when the axial pressure of the end of the column increases. In order to make the joint energy dissipation capacity relatively good, the axial compression ratio should be controlled in the range of 0.4 ~ 0.8, and when the wall thickness of steel pipe increases, the bearing capacity of the joint will be improved accordingly. However, the energy dissipation capacity of the structure is very small when the wall of the steel pipe exceeds a certain thickness. For the sake of economic period, the steel content ratio should be controlled in the range of 0.126 ~ 0.167. In this paper, the seismic behavior of concrete-filled steel tubular columns and steel beam joints is deeply analyzed, and the conclusion provides valuable data and reference basis for the research and application of reinforced ring joints of steel-reinforced concrete filled steel tube structures.
【学位授予单位】：西安科技大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TU398.9;TU352.11

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