CAJ | 학술논문

针对现有关于张弦梁结构基于刚度的参数分析和优化研究较为缺乏的不足，采用有限元方法对此问题进行研究。首先，结合某实际张弦梁结构模型并通过变化其主要参数值(如上弦抗弯刚度与下弦轴向刚度比值、上弦轴向刚度与下弦轴向刚度比值、高跨比和下弦索面积等)建立了多个结构模型，然后进行相应刚度分析，得到了这些主要参数对结构竖向整体刚度的影响规律和刚度优化设计的建议。结果表明：在参数分析范围内，当结构高跨比、上弦轴向刚度与下弦轴向刚度比值和上弦长细比一定时，张弦梁结构刚度近似与下弦索面积成正比；在工程实践中，为了在经济效果较优的情形下获得较大的刚度，建议张弦梁结构选用较大的结构高跨比、索垂跨比和较小的上弦轴向刚度与下弦轴向刚度比值。
침대현유관우장현량결구기우강도적삼수분석화우화연구교위결핍적불족，채용유한원방법대차문제진행연구。수선，결합모실제장현량결구모형병통과변화기주요삼수치(여상현항만강도여하현축향강도비치、상현축향강도여하현축향강도비치、고과비화하현색면적등)건립료다개결구모형，연후진행상응강도분석，득도료저사주요삼수대결구수향정체강도적영향규률화강도우화설계적건의。결과표명：재삼수분석범위내，당결구고과비、상현축향강도여하현축향강도비치화상현장세비일정시，장현량결구강도근사여하현색면적성정비；재공정실천중，위료재경제효과교우적정형하획득교대적강도，건의장현량결구선용교대적결구고과비、색수과비화교소적상현축향강도여하현축향강도비치。
Stiffness analysis and optimization were performed for beam string structure ( BSS ) with the finite element method since it lacks sufficient discussion on parameter analysis and optimization on stiffness in current studies. Multiple models were built by varying the values of the major parame-ters ( e. g. ratio of the bending stiffness of upper chord to the axial stiffness of lower chord, ratio of the axial stiffness of upper chord to that of lower chord, height-to-span ratio and cable area of lower chord) of a beam string structure. The corresponding analysis was performed, and the effects of the major parameters on the global vertical stiffness and the suggestion on stiffness optimization were ob-tained. The results show that, within the mentioned ranges of the parameters, the stiffness of BSS is nearly proportion to its lower chord area when the height-to-span ratio, ratio of axial stiffness of up-per chord to that of lower chord and slenderness of upper chord are given;that it is recommended to adopt a large height-to-span ratio, a large sag-to-span ratio of cable and a small axial stiffness ratio of upper chord to lower chord for BSS design in order to obtain a large stiffness based on economic optimization.