摘要
世博温室项目屋盖为任意不规则曲线组成的无曲率平面,采用异形多边形网格加大透光率,基于这些特点,选型最终定为张弦铝合金网格结构。本项目挤压出新型“日”字型挤压铝合金构件以更好地承受屋盖面内弯矩,保证杆件与整体结构平面内有效传力。设计了新型刚接板式节点并通过足尺试验和精细化有限元分析研究了节点刚度与极限承载力,试验及有限元对比分析结果表明,该类节点有较高的抗剪、平面内和平面外承载力。阐述了弯扭构件数字化加工工艺及不规则铝合金特殊单元式的装配式预拼装技术,引入立面幕墙与主体结构一体化设计技术,其中立面幕墙面板设计首次通过整体协同分析考虑了主体结构变形的影响,计算结果表明设计构造满足要求。重点说明了双向正交布置拉索的施工张拉模拟计算方法,验证了索力分级张拉时结构处于安全状态,张拉完毕结构变形满足要求。
The World Expo Greenhouse project roof is a curvature-free plane composed of arbitrary irregular curves,and adopts a shaped polygonal mesh to increase light transmittance.Based on these characteristics,structure selection adopted a string aluminium alloy grid structure.The new extruded“日”type aluminium alloy members were extruded to better withstand bending moment in the roof surface and to ensure effective force transmission between members and overall structure plane.The new type of rigid gusset plate joint was designed,its stiffness and ultimate bearing capacity were investigated through full-scale tests and refined finite element analysis.Test’s results and finite element comparison analysis show that this type joint has high shear resistance and in-plane and out-of-plane load capacity.Digital processing techniques for bending-twisting components and the assembly pre-fabrication technology for irregular aluminum alloy special units were elaborated and integration design technology of façade curtain wall and main structure was introduced,in which façade curtain wall panels design for the first time takes into account deformation of the main structure through the overall synergistic analysis,and the calculation results show that design structure meets the requirements.Construction tensioning simulation method of two-way orthogonal arrangement of tensioning cables is highlighted,and it is verified that this structure is in a safe state with graded tensioning of cables,and structure deformation after tensioning meets the requirements.
作者
刘小蔚
李志强
欧阳元文
LIU Xiaowei;LI Zhiqiang;OUYANG Yuanwen(Shanghai Tongzheng Aluminium Structure Construction&Technology Co.,Ltd,Shanghai 201106,China;Shanghai Jianke Aluminium Structure&Engineering Research Institute,Shanghai 201199,China)
出处
《建筑结构》
北大核心
2024年第10期73-80,共8页
Building Structure
基金
上海市2021年度“科技创新行动计划”社会发展科技攻关项目(21DZ1203003)。
关键词
张弦铝合金网格结构
“日”字型挤压构件
刚接板式节点
足尺试验
装配式预拼装
张拉成形
string aluminum alloy grid structure
"日"shaped extruded member
rigid gusset plate joint
full-scale test
prefabricated pre-assembly
tensioned shaping
作者简介
第一作者:刘小蔚,硕士,高级工程师,主要从事铝合金结构相关技术研究工作,Email:liuxiaowei@tal⁃china.com。
