某超高层住宅项目结构设计若干问题研究

Research on Structural Design of A Super High-Rise Residential Building

本工程RT1为超B级高度的高层住宅,采用现浇钢筋混凝土框架-剪力墙结构体系。因建筑对内部使用空间的要求,对梁、柱、剪力墙截面均进行了限制。采用混凝土框架柱时,轴压比超限过规范限值较多。本工程采用较大含钢率的钢骨混凝土柱,并对型钢与混凝土的粘结性能进行了计算分析,确保型钢与混凝土可以共同受力,不产生滑移破坏。因建筑使用功能要求,1层、12层、25层不得设置阳台角柱,为满足Y向位移角要求,阳台角柱分为三段设置,并在1层顶、12层及25层顶悬挑梁上进行转换。基于抗震性能化设计,结合本项目超限情况,对悬挑转换梁及剪力墙墙肢受拉情况进行了重点分析,满足性能目标,保障结构安全。

RT1 is a super-B high-rise residential building with cast-in-place reinforced concrete frame-shear wall structure system.The sections of beams,columns and shear walls are restricted due to the requirement of internal use space.When the concrete frame columns are used,the axial pressure ratio exceeds the specification limits more often.The project adopts steel-boned concrete columns with large steel content,and the bonding performance between the section steel and concrete is calculated and analyzed to ensure that the section steel and concrete can be subjected to common force without slippage damage.Due to the functional requirements of the building,no balcony corner column should be set on the 1 st floor,12 th floor and 25 th floor.In order to meet the Y-directional displacement angle requirement,the balcony corner columns are divided into three sections and converted on the overhanging beams of the 1-story,12-story and 25-story roof.Based on the design of seismic performance,and taking into account the over limit of the project,the tensile conditions of the cantilevered conversion beams and shear wall limbs were analyzed to meet the performance target and ensure structural safety.