用等效降温法模拟预应力来实现张弦梁结构找形

Application of the equivalent lowering temperature method in simulating pre-stress tension procedure to solve the form-search of BSS

主要采用等效降温法来模拟预应力完成预应力张弦梁结构找形问题,并将此方法和力模拟法、初应变模拟法进行比较,发现等效降温法更加有效.从而采用等效降温法获得零状态几何放样,和相应的初始态预应力分布来完成张弦梁结构的施工.同时将考虑几何非线性计算和线性计算的结构位移进行比较,得出在张弦梁结构找形分析时考虑几何非线性的结果.

Beam string structure （abbrev. BSS） is an inner equilibrium system whose bending resistance member and tension member is linked by brace strut. Application of the equivalent lowering temperature method in simulating pre-stress tension procedure to solve the form finding of BSS was studied in the paper. This method, force method and initial strain method were compared. It is found that the equivalent lowering temperature method is most effective. It makes use of the equivalent lowering temperature method to obtain initial geometry in zero status and stress distribution in initial equilibrium state which can finish construction of BSS. Structure displacement based on geometric linear and non-linear calculations were compared, it is proposed that considering geometric non-linear is necessary in form-search of BSS.