玻璃幕墙中钢板肋稳定性分析及设计方法研究

Design method for the stability of steel fins in curtain walls

近年来钢板肋支承玻璃幕墙在大型公共建筑中得到广泛使用,钢板肋截面面内受弯存在面外的稳定性问题,幕墙设计规范中未提及该部分设计方法,钢结构相关设计规范受弯稳定计算公式未明确板肋截面是否适用。结合以上问题,本文利用弹性稳定理论受弯构件临界弯矩通式,结合现行规范对稳定系数的修正,建议了钢板肋受弯稳定计算方法。为了验证该计算方法的适用性,对钢板肋分别进行弹性有限元分析和考虑初始缺陷、几何非线性以及材料非线性弹塑性有限元分析。结果表明,本文提出的钢板肋受弯稳定计算方法具有较高准确性,可为工程设计提供参考依据。

Steel fins supported glass curtain wall has been widely used in large public buildings in recent years.Steel fins are the main structure elements in curtain wall systems,which could become unstable under in-plane bending moment.The design method of steel fins is not mentioned in curtain wall design codes,and the calculation formula for bending stability of the steel structure related design codes doesn’t specify whether the plate fin section is applicable.In order to make up the blank in this field,based on elastic stability theories and combined with the modification of the stability coefficient in the current code,a design formula is put forward.In order to verify the accuracy of the design formula,in consideration of initial defect,geomertric nonlinearity and material nonlinearity,the plate fins’elastic and elastoplastic stability is analyzed by using the finite elements method software.The results show that the method proposed in this paper has high accuracy and can provide reference for engineering design.