Parametric optimization of pre-stressed steel arch-shaped trusses with ties

[摘要] An algorithm of searching for the efficient values of the parameters of pre-stressed steel arch trusses with high-strength ties is currently being developed. The task in focus is to reduce the cost of the operating trusses while taking into consideration the strength, rigidness, and stability limitations as per regulatory requirements. It is assumed that a truss shall be fastened to be displaced from its plane by the nodes, and its bars shall generally be subjected to stretching-compression and in-plane bending. The cross-section areas of bars and ties along with the pretension force vary within discrete sets of allowable values. The optimization is performed via a genetic algorithm. The strain-stress state of the structure variants is calculated basing upon the finite element method. The feasibility of the suggested method was illustrated for optimal engineering of a steel truss with a 60 m span, pre-stressed with a double-lay rope.

[发布机构] Construction Institute, Bryansk State Engineering and Technology University, Stanke Dimitrov Ave., 3, Bryansk; 241037, Russia^1

[学科分类] 土木及结构工程学

[关键词] Cross-section area;Discrete sets;High strength;In-plane bending;Parametric optimization;Pre-stressed steel;Regulatory requirements;Stress state