长安乐歌剧院——不规则混合结构设计
引用文献：
郭东 韦孙印 王洪臣. 长安乐歌剧院——不规则混合结构设计[J]. 建筑结构，2022，48（11）：36-42.
GUO Dong WEI Sunyin WANG Hongchen. Design of irregular mixed structure——Chang'an Yue Opera House[J]. Building Structure，2022,48（11）：36-42.
摘要：长安乐歌剧院为空间曲面造型，整体结构平面呈椭圆形，结构形式复杂。主体结构采用钢框架-钢筋混凝土剪力墙混合结构。结构平面在3层以上四周均悬挑，用悬挑钢桁架实现结构平面逐层悬挑并将其作为幕墙钢结构的主要受力构件。主体结构存在较多不规则：结构主功能区空旷，楼板大开洞，楼层标高复杂造成楼板不连续；剪力墙及悬挑钢桁架偏向后舞台布置，造成主体结构刚度分布不均匀；台口转换桁架及悬挑钢桁架造成竖向受力构件不连续，层刚度及承载力突变；钢框架先于混凝土剪力墙施工等。针对结构特点，通过风洞试验获得了主体结构风荷载响应，同时对结构采取了相应的加强措施：加厚楼板并加强配筋，剪力墙开洞弱化后舞台一侧结构刚度，加强悬挑钢桁架环向楼层钢梁轴向刚度，剪力墙均匀布置钢管混凝土柱等。采用基于性能化的设计方法，对不同结构构件分别制定了性能目标，计算分析结果表明，结构能够实现预期设计目标。
关键词：混合结构；不规则结构；悬挑钢桁架；性能化设计；空间曲面；加强措施
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参考文献[1] 建筑抗震设计规范：GB 50011—2010 [S].2016年版.北京：中国建筑工业出版社，2016.
[2] 曹万林，王敏，王绍合，等.矩形钢管混凝土边框组合剪力墙及筒体结构抗震研究[J].工程力学，2008,25(S1):58-70.
[3] 组合结构设计规范：JGJ 138—2016 [S].北京：中国建筑工业出版社，2016.
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[2] 曹万林，王敏，王绍合，等.矩形钢管混凝土边框组合剪力墙及筒体结构抗震研究[J].工程力学，2008,25(S1):58-70.
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Design of irregular mixed structure——Chang'an Yue Opera House
Abstract: Chang'an Yue Opera House is shaped as a space curved surface, the plane of the overall structure is elliptical, and the structural form is complex. The main structure adopts a hybrid structure of steel frame-reinforced concrete shear wall. All sides of the structural plane are cantilevered above the third floor. The cantilevered steel truss is used to realize the layer by layer cantilevered structure plane, and is used as the main stress component of the curtain-wall steel structure. There are many irregularities in the main structure: the main functional area of the structure is empty, the floor is greatly opened, and the floor elevation is complex, resulting in the discontinuity of the floor; shear walls and cantilevered steel trusses are inclined to the rear stage layout, resulting in uneven stiffness distribution of the main structure; the transition truss at the proscenium arch and the cantilevered steel truss cause the discontinuity of vertical load-bearing components and the sudden change of floor stiffness and bearing capacity; steel frame construction precedes concrete shear wall construction. According to the structural characteristics, the wind load response of the main structure was obtained through the wind tunnel test. At the same time, the corresponding strengthening measures were taken for the structure: thickening the floor slab and strengthening the reinforcement, weakening the structural stiffness on one side of the rear stage after the opening of the shear wall, strengthening the axial stiffness of the steel beam in the circumferential floor of the cantilevered steel truss, and uniformly arranging the concrete-filled steel tubular columns in the shear wall. The performance-based design method was adopted to formulate performance objectives for different structural components. The results of calculation and analysis show that the structure can achieve the expected design goal.
Keywords: mixed structure; irregular structure; cantilevered steel truss; performance-based design; space curved face; strengthening measure
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