【摘要】 本文从一种新型索杆张力结构———环形张力索桁罩棚结构的施工成型分析出发,阐述了该问题的实质是一组已知构件原长的松弛索杆体系在其自重作用下的几何非稳定平衡形态的找形分析。根据力密度法的思想,本文提出了一种松弛索杆体系几何非稳定平衡形态的通用找形方法。该方法不受结构形式的限制,且引入了很少的计算假定,能够解决不同形式的索杆张力结构施工过程的形态分析问题。本文还模拟了一环形张力索桁罩棚结构的成型过程,利用该方法求解其施工过程每个步骤下的形态。算例分析结果表明,该找形方法能够有效地模拟索杆张力结构的实际成型过程。更多还原

【Abstract】 This paper concerns the during-erection shape analysis of Annular Tensile Cable-Truss Canopy Structure(ATCTCS),a new type of cable-strut tensile structures.The essential problem is expounded as the form-finding analysis of a slack cable-strut system of with comperents loose lengths and under geometrically unstable equilibrium state maintained by its deadweight with given loose lengths of components.Based on the principle of the force density method,a new shape finding method for the solution of this special problem is developed.With few theoretical assumptions,this method is suitable for the shape analysis of various types of cable-strut tensile structures.A simulation of the erection of an ATCTCS is carried out successfully,illustrating the accuracy and validity of this method for further applications in engineering.更多还原