吊装自成型GFRP弹性网壳的找形方法与施工过程模拟

FROM-FINDING METHOD AND CONSTRUCTION SIMULATION OF HOSTING INDUCED SELF-FORMING GFRP ELASTIC GRIDSHELL

吊装自成型GFRP弹性网壳结构由统一规格的GFRP长直圆管杆件组成,并利用GFRP材料自重轻、弹性模量低的特点,使得杆件在吊装过程中由于自重作用产生弯曲变形,从而自动形成设计所需曲面。采用有限元方法并结合程序二次开发,针对一种具有单轴对称曲面的GFRP弹性网壳结构进行找形分析,提出相应的找形迭代算法并通过实例验证其有效性,在此基础上开展吊装施工全过程数值模拟。结果表明,找形算法具有很好的计算精度和计算效率,能满足此类网壳结构的设计和施工要求,成型后的网壳结构具有很好的承载能力储备。

Hoisting induced self-forming GFRP elastic gridshells are made of long-continuous standardized glass fiber reinforced polymer（ GFRP） circular tubes with properties of high elastic strain and low modulus. The space surfaces of the gridshells,which mainly behave as the bending deformations of the tubular members,are automatically formed because of the gravity effects during hoisting. By employing finite element method and programming tools,this paper presents a form-finding algorithm for a certain type of elastic gridshell that has the single symmetry plane,followed by the numerical simulation of hosting construction process. The proposed form-finding algorithm is proved to have good calculation accuracy and efficiency to meet the design and construction requirements. The constructed GFRP gridshell structures are found to behave reliable load bearing capacities.