某超高层结构方案优化设计
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摘要
天津某超高层建筑塔楼75层,屋面高度330m。采用“钢管混凝土柱框架+核心钢板剪力墙体系+外伸刚臂抗侧力体系”的结构体系,其中钢板剪力墙(Steel Plate Shear wall)作为抗侧力体系的重要组成部分,在我国高层建筑中应用较少,我国规范也未规定此体系的高度限制值。但是国内外的试验和国外钢板剪力墙高层建筑在地震中的表现都显示钢板剪力墙具有优良的性能。本文以其作为工程背景。通过建立不同的分析模型与原楼钢板剪力墙体系进行受力性能与经济效应的比较分析,主要研究内容与成果如下:
采用ETABS对该超高层建筑建立了五个分析计算模型。分别为原楼钢板剪力墙模型、混合结构模型一、混合结构模型二、钢管混凝土柱框架-支撑模型、螺旋支撑外筒模型。模型中结构构件的几何尺寸与结构图相符。根据规范要求进行荷载组合,包括主要方向的地震作用和风荷载。
对各结构方案进行弹性计算分析,按照规范要求针对振型信息、结构位移、最小地震剪力、框架承担剪力比例、结构抗扭、层刚度等性能指标进行具体的分析探讨,结果表明各模型弹性性能指标均符合相关规范要求。
对各结构方案7度常遇地震作用下的性能和经济效应做了对比分析,结果表明:(1)钢板剪力墙体系性能优越,其抗侧刚度远大于支撑结构体系,且结构自重远小于高强钢筋混凝土结构;(2)在外围框架上增设大型斜撑可以有效提高结构整体刚度;(3)在超高层建筑中使用单一的钢框架-支撑结构体系并不合理;(4)螺旋斜撑外筒体系具有良好的承重能力和抗侧性能。
The super high-rise building is a 330 meter tall 75-story office building located in Tianjin, China. The main lateral force resisting system for the tower consists of a frame-shear wall system comprised of a perimeter ductile moment-resisting frame and an interior shear wall core linked together with outrigger and belt trusses. The application of Steel Plate Shear walls (SPSW) in high-rise buildings is rare in our country and China standard has not stipulated the height limit of this system. But a number of researches at home and abroad have shown SPSW with excellent performance. Based on this project, this paper established five different analysis models and compared each system’s performance and economic effect. The main research contents and the results are as follows:
Frist, the five models are established by ETABS based on this super high-rise building. They are SPSWs system, Hybrid structureⅠ, Hybrid structureⅡ, Concrete-filled steel tube column frame-support model and Spiral support-tube structure. In order to facilitate a more accurate analysis, structural members in the model have the geometries matched the structural drawings. Load combinations include all principle directions of earthquake and wind with all applicable load-case combinations per the china code.
Second, run elastic analysis got related performance index. Such as Vibration model, Displacement of structure, Shear/Gravity Ratios, Frame Shear Ratios, Building Torsion Check, Story Stiffness. The results show that the model elastic properties can meet the relevant code specification.
Third, with the compare of each model’s performance and economic effect under the action of 7 degrees earthquake, some conclusions can be drawn, as the following: (1) SPSWs have a superior performance, its elastic stiffness is much higher than a brace structure, and they are much lighter compared to reinforced concrete shear walls;(2)the stiffness of the overall structure can be effectively increased by adding a large steel braces on the outer frame; (3)It’s not suitable to use a single steel frame-support structure system in super high-rise building; (4) Spiral support-tube structure has good bearing ability and resisting lateral performance.
采用ETABS对该超高层建筑建立了五个分析计算模型。分别为原楼钢板剪力墙模型、混合结构模型一、混合结构模型二、钢管混凝土柱框架-支撑模型、螺旋支撑外筒模型。模型中结构构件的几何尺寸与结构图相符。根据规范要求进行荷载组合,包括主要方向的地震作用和风荷载。
对各结构方案进行弹性计算分析,按照规范要求针对振型信息、结构位移、最小地震剪力、框架承担剪力比例、结构抗扭、层刚度等性能指标进行具体的分析探讨,结果表明各模型弹性性能指标均符合相关规范要求。
对各结构方案7度常遇地震作用下的性能和经济效应做了对比分析,结果表明:(1)钢板剪力墙体系性能优越,其抗侧刚度远大于支撑结构体系,且结构自重远小于高强钢筋混凝土结构;(2)在外围框架上增设大型斜撑可以有效提高结构整体刚度;(3)在超高层建筑中使用单一的钢框架-支撑结构体系并不合理;(4)螺旋斜撑外筒体系具有良好的承重能力和抗侧性能。
The super high-rise building is a 330 meter tall 75-story office building located in Tianjin, China. The main lateral force resisting system for the tower consists of a frame-shear wall system comprised of a perimeter ductile moment-resisting frame and an interior shear wall core linked together with outrigger and belt trusses. The application of Steel Plate Shear walls (SPSW) in high-rise buildings is rare in our country and China standard has not stipulated the height limit of this system. But a number of researches at home and abroad have shown SPSW with excellent performance. Based on this project, this paper established five different analysis models and compared each system’s performance and economic effect. The main research contents and the results are as follows:
Frist, the five models are established by ETABS based on this super high-rise building. They are SPSWs system, Hybrid structureⅠ, Hybrid structureⅡ, Concrete-filled steel tube column frame-support model and Spiral support-tube structure. In order to facilitate a more accurate analysis, structural members in the model have the geometries matched the structural drawings. Load combinations include all principle directions of earthquake and wind with all applicable load-case combinations per the china code.
Second, run elastic analysis got related performance index. Such as Vibration model, Displacement of structure, Shear/Gravity Ratios, Frame Shear Ratios, Building Torsion Check, Story Stiffness. The results show that the model elastic properties can meet the relevant code specification.
Third, with the compare of each model’s performance and economic effect under the action of 7 degrees earthquake, some conclusions can be drawn, as the following: (1) SPSWs have a superior performance, its elastic stiffness is much higher than a brace structure, and they are much lighter compared to reinforced concrete shear walls;(2)the stiffness of the overall structure can be effectively increased by adding a large steel braces on the outer frame; (3)It’s not suitable to use a single steel frame-support structure system in super high-rise building; (4) Spiral support-tube structure has good bearing ability and resisting lateral performance.
引文
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[5] ANSI/AISC 341-05钢结构建筑抗震规定
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[28]周健,汪大绥,高层斜交网格结构体系的性能研究,建筑结构,2007,37(5)
[29]张崇厚,赵丰,高层斜交网筒结构体系抗侧性能相关影响因素分析,土木工程学报,2009,42(11)
[30]黄超,韩小雷等,斜交网格结构体系的参数分析及简化计算方法研究,建筑结构学报,2010,31(1)
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