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| Optimal design of long span steel-concrete composite floor system |
Yi-fan WU1,2( ),Wen-hao PAN1,3,4,*(),Yao-zhi LUO1,4 |
1. Space Structure Research Center of Zhejiang University, Hangzhou 310058, China
2. Center for Balance Architecture, Zhejiang University, Hangzhou 310028, China
3. Architectural Design and Research Institute of Zhejiang University Co. Ltd, Hangzhou 310028, China
4. Key Laboratory of Space Structures of Zhejiang Province, Hangzhou 310058, China |
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Abstract An optimal design problem of long span steel-concrete composite floor system was investigated based on important parameters to aim at the economical and applicable conditions and optimizing orientations of long span steel-concrete composite floor. The objective function was set as economical equivalent steel consumption, and the variables contained eight parameters including dimensions of the steel section, intermediate distance between steel sections and thickness of concrete slab. The objective function was constrained to the plastic theory, standards and construction experience. The generalized reduced gradient method (GRG) was used to generate optimal sections with minimum economical equivalent steel consumption under different spans and live loads. According to the optimization results, the composite floor within a span of 60 m and a variable load of 6 kN/m2 could efficiently facilitate the composite effect of composite structure and has good economic benefits. As for super-long span composite floor when the traditional I-section floor system is not economically suitable, the composite floor with corrugated web is recommended for improving the bearing efficiency of steel web. A new cable-supported composite floor system was proposed based on the cable-supported beam for its high efficiency in mechanism.
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Received: 29 April 2022
Published: 09 May 2023
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| Fund: 浙江省基础公益研究计划资助项目（LQ21E080020）；国家自然科学基金资助项目（52108181）；浙江大学平衡建筑研究中心科研项目（2021-KYY-512102-0016） |
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Corresponding Authors:
Wen-hao PAN
E-mail: wuyifann@zju.edu.cn;pan_wh@zju.edu.cn
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大跨钢-混凝土组合楼盖的优化设计
针对大跨度钢-混凝土组合楼盖的经济适用工况和优化方向，以重要参数为基础，对大跨钢-混凝土组合楼盖的优化设计问题进行研究. 在优化分析时，以组合楼盖的经济等效用钢量为目标函数，变量包括钢梁截面尺寸、钢梁间距和混凝土翼板厚度等8个参数，约束条件服从塑性设计理论、规范规定和工程经验. 在不同跨度和可变荷载下，利用广义简约梯度（GRG）算法求解获得经济等效用钢量最小的组合梁截面. 根据优化结果，跨度小于60 m、可变荷载小于6 kN/m2的组合楼盖能够有效地发挥组合结构的组合作用，具有较好的经济效益. 对于传统组合楼盖经济适用性不强的超大跨楼盖，从提高腹板承载效率的角度，可以使用波形钢腹板组合楼盖体系，考虑张弦梁受力高效的优点提出新型弦支组合楼盖体系.
关键词：
钢-混凝土组合楼盖,
优化设计,
大跨结构,
经济等效用钢量,
弦支组合楼盖,
广义简约梯度法
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