【摘要】 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。更多还原

【Abstract】 A column in the first floor of one super high-rise building can not extend to the basement and there is a gap of 1.4m between the upper column and the down column.The vertical load from the upper column is so great that SRC beam-transfer-storey with little offset malposition colomn is designed here and the load can be transferred to the down column.Because this kind of transfer-storey joint is very complicated and the force transmission is not very clear,the transfer-storey joint bearing performance is hereby studied.According to ANSYS numerical analysis and the bearingcapacity test on 1 /5 scale models,the strains and the stresses on either section steel or rebar or concrete are known and the cracks on the surface of concrete,the deflection of the transfer-girder are found.Under the design load,structure designs of the transfer-storey joints meet the demands of carrying capacity and normal working.Under the combination load with large earthquake,many cracks appear on the transfer-storey joint while it can keep on bearing.The study shows that the failure region of the transfer-storey is the joint zone on the transfer-girder enclosed by the upper column and the down column.The ultimate load is determined by the concrete cracking of the joint zone.The design rules of SRC beam-transfer-storey with little offset malposition colomn is the requirements of ductility and ultra strength for the joint.更多还原