（北京市建筑设计研究院有限公司， 北京 100045）

［摘要］合肥市科技馆新馆（自然博物馆）建筑高度38-5m，为具有扭转不规则、偏心布置、凹凸不规则、楼板不连续、尺寸突变等不规则项的特别不规则超限高层建筑，其中从地面延伸至26-5m高、总长138m的种植大悬挑斜屋面是建筑造型亮点。虽然单向大面积斜板在地震作用下具有斜撑作用，但会引起双向刚度不均、扭转、底部竖向构件剪力集中、大量短柱和超短柱、传统结构楼层整体指标（层间位移角、位移比、0-2V0调整系数等）的计算方法不适用等问题。针对上述结构设计难点，采取了以下设计措施：1）采用合理的构造做法，在斜板底部设置滑动支座，释放水平向约束，减小斜板对整体刚度影响，避免地震下底部内力集中；2）按构件真实布置建立空间计算分析模型，模拟结构实际刚度和复杂受力情况；3）选择合适的楼层指标统计方法，并补充平板模型对比分析，以反映结构在地震下的整体性能；4）采用动力时程分析法补充计算；进行大震下的动力弹塑性时程分析；5）合理指定关键构件，设定合理性能目标和加强措施。结果表明，采取以上措施满足结构抗震性能目标。

［关键词］斜板； 性能目标； 抗震措施； 关键构件； 大悬挑； 不规则超限高层建筑

中图分类号：TU398-7文献标识码：A文章编号：1002-848X(2019)18-0071-06

Structural  design of Hefei Science and Technology Museum (Natural Museum)

Geng Haixia, Jiang Yang, Zhou Wenjing, Chang Yingying, Li Ting, Yang Yong, He Yang

（Beijing Institute of Architectural Design, Beijing 100045, China）

Abstract:Hefei Science and Technology Museum (Natural Museum) is 38-5m high-rise building with irregular torsion, eccentric layout, concave-convex irregularity, discontinuous floor and abrupt size change. It is a special irregular out-of-code high-rise building. The planting large-cantilever inclined roof with a total length of 138m extending from the ground to the height of 26-5m is the highlight of architectural modeling. Although the single-direction inclined plate with large area has the inclined bracing effect under the earthquake, it will cause the problems such as uneven bidirectional stiffness, torsion, concentrated shear force of vertical members at the bottom, a large number of short columns and ultra-short columns, and inapplicable traditional calculation method of the overall indexes of structure floors including inter-story displacement angle, displacement ratio, adjustment coefficient for 0-2V0. In view of the above structural design difficulties, the following design measures were adopted: 1) reasonable structural practices were adopted by setting sliding supports at the bottom of the inclined plate to release horizontal constraints, reduce the impact of the inclined plate on the overall stiffness and avoid the concentration of internal forces at the bottom under the earthquake; 2) a spatial calculation and analysis model was established according to the real layout of the components to simulate the actual stiffness and complex stress of the structure; 3) the appropriate statistical method of floor indicators was selected, and the plane plate model was supplemented as the comparative analysis to reflect the overall performance of the structure under the earthquake; 4) dynamic time-history analysis method was conducted for supplementary calculation, and dynamic elastic-plastic time-history analysis was carried out under the rare earthquake; 5) key components were reasonably specified to set reasonable performance targets and strengthen measures. The results show that the above measures meet the seismic performance target of the structure.

Keywords:inclined plate; performance objective; seismic measure; key element; large cantilever; irregular out-of-code high-rise building