广州科技图书馆结构设计要点与分析

Structural design points and analysis of Guangzhou Science and Technology Library

广州科技图书馆为复杂超限高层结构,采用钢框架-偏置混凝土筒体结构。由于建筑造型需要,外圈框架柱无法贯通落地,采用“上托下吊”重载悬空结构,对该结构形式受力进行了分析。介绍了新型“抗、放”结合的疏水减压抗浮技术在超深地下室中的应用。由于结构存在扭转偏大、抗扭刚度弱等多项不规则,采用YJK、ETABS两个计算软件对结构进行了中震反应谱分析,介绍了针对扭转偏大采取的结构设计措施,补充了中震弹性时程分析,对悬挑桁架和斜柱进行了专项分析,并采用Perform-3D进行了罕遇地震动力弹塑性时程分析。结果表明采取的抗震加强措施有效,可实现预设的抗震性能目标。

The Guangzhou Science and Technology Library adopts complex ultra-limit high-rise structure with a steel frame-offset concrete cylinder structure.Due to the need for architectural modeling,the outer ring frame column cannot be grounded,and a“top support and bottom hanging”heavy load suspension structure was adopted,and the force of this structure form was analyzed.The application of the new“resistance and release”combined drainage pressure reduction buoyancy technology in the ultra-deep basement was introduced.Due to the existence of multiple irregularities such as large torsion and weak torsional stiffness in the structure,two calculation software YJK,ETABS were used to perform the medium earthquake response spectrum analysis on the structure,and the structural design measures taken for large torsion were introduced,and the medium earthquake equivalent elastic time history analysis was supplemented.Special analysis was carried out on the cantilever truss and inclined column,and dynamic elastoplastic time history analysis under rare earthquake was carried out by using Perform-3D.The results show that the seismic strengthen measures taken for the structure are effective and can achieve the preset seismic performance goals.