论文部分内容阅读
某超高层建筑一层的一根柱无法直接落到地下室,上下柱形成1.4m小偏移。该柱竖向荷载巨大,为此设置了转换梁,形成小偏移错位柱SRC梁式转换层,将荷载传至下柱。鉴于小偏移错位柱SRC梁式转换层节点区构造复杂,受力及传力途径不十分明确,进行了转换层节点承载性能研究。通过转换层有限元分析和1/5模型承载力试验,明确了转换层节点在设计荷载和极限荷载作用下型钢、钢筋、混凝土的应变、应力、混凝土开裂情况及转换梁的挠度变化情况。得出该转换层节点区在设计荷载作用下,结构设计满足承载能力和正常使用的要求;在大震组合值作用下,转换层节点出现较大裂缝,但能够继续承载。研究表明:小偏移错位柱SRC梁式转换层破坏区域为上柱、偏置下柱以及二者之间的转换梁组成的转换层节点区,该转换层极限荷载由节点区混凝土开裂状态确定。此类转换层的设计原则为满足转换层节点的延性和超强设计要求。
A column of a super tall building can not directly fall into the basement, the upper and lower columns to form a small offset 1.4m. The column vertical load is huge, for which set the conversion beam, the formation of small offset column SRC beam conversion layer, the load to the next column. In view of the complex structure of the SRC beam-type conversion layer in the small offset column, the bearing capacity and force transmission are not very clear, and the bearing capacity of the SRC is studied. Through the finite element analysis of transfer layer and the test of 1/5 model bearing capacity, the deformation, stress, cracking condition of concrete and the deflections of the transition beam under the design load and the ultimate load were clearly determined. The results show that under the design loads, the structural design of the transfer layer meets the requirement of bearing capacity and normal use. Under the combination of large earthquake, the joints of the transfer layer have larger cracks but can continue to carry. The results show that the failure zone of the SRC beam transfer layer in the small displacement column is the upper column, the lower column and the transfer layer node between the two. The ultimate load of the transfer layer is determined by the cracking state of the concrete in the node area . The design principle of such conversion layer is to meet the ductility and super-design requirements of the conversion layer node.