海口双子塔-南塔折线型腰桁架设计研究
摘要：海口双子塔-南塔结构体系为设置加强层的巨型支撑框架-核心筒混合结构，其中腰桁架采用折线型布置，其与在同一平面内布置的常规直线型腰桁架在受力性能、杆件布置和节点构造上均有较大不同。通过对不同弦杆夹角腰桁架结构模型算例的计算分析，得到了折线型腰桁架杆件的弯曲变形、剪切变形、轴向变形和扭转变形分量分别引起的结构侧向变形的比例关系，及主要变形分量引起的结构侧向变形与折线型腰桁架弦杆夹角的关系，提出了影响折线型腰桁架抗侧刚度的主要影响因素与变化规律，折线型腰桁架的抗侧刚度与腰桁架弦杆夹角正弦的平方近似为线性关系。根据折线型腰桁架的特点提出了杆件布置和节点设计的原则，对于复杂空间结构桁架合理设置腹杆角度可以使节点设计简单、传力可靠。
关键词：海口双子塔；超高层建筑；加强层；腰桁架；抗侧刚度
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[4] 张特，张同亿，张松，等.海口双子塔-南塔核心筒设计与研究[J].建筑结构，2022,52(16):11-16.
[5] 罗佑新，张同亿，王宁，等.海口双子塔-南塔钢结构抗火设计[J].建筑结构，2022,52(16):17-21.
[6] 王宁，张同亿，肖自强，等.海口双子塔-南塔桩-筏基础设计与研究[J].建筑结构，2022,52(16):26-31,66.
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[8] 周建龙，包联进，钱鹏.超高层结构设计的经济性及相关问题的研究[J].工程力学，2015,32(9):9-15.
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Study on fold-line-shaped belt truss of Haikou Twin Towers-South Tower
Abstract: The structural system of Haikou Twin Towers-South Tower is mixed structure of mega brace frame-corewall with strengthened-stories. Compared with the conventional linear belt truss arranged in one space, the belt trusses are different in the mechanical performance, the arrangement of the members and the joints construction. Through the calculation and analysis of the model examples of belt truss structures with different chord angles, the proportional relationship of the lateral deformation of the structure caused by the bending deformation, shear deformation, axial deformation and torsional deformation components of the fold-line-shaped belt truss members, and the relationship between the lateral deformation of the structure caused by the main deformation components and the chord angle of the fold-line-shaped belt truss, the main influencing factors and the changing law of the lateral stiffness of the fold-line-shaped belt truss were put forward. The lateral stiffness of the fold-line-shaped belt truss is approximately linear with the square of the sine of the chord angle of the belt truss. According to the characteristics of the fold-line-shaped belt truss, the principles of member arrangement and joint design were put forward. For complex space structure truss, reasonable setting of the web member angle can make the joint design simple and the force transmission reliable.
Keywords: Haikou Twin Towers; super high-rise building; strengthened-stories; belt-truss; lateral stiffness
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