- 摘 要
-
（天津大學(xué)建筑工程學(xué)院，天津 300072）
［摘要］在已有研究成果的基礎(chǔ)上，著重分析研究了影響弦支混凝土集成屋蓋結(jié)構(gòu)靜力學(xué)特性及其自振特性的主要因素。研究表明，適當增大結(jié)構(gòu)的垂跨比和拉索截面均可有效地改善結(jié)構(gòu)受力；增大板厚可在一定程度上改善結(jié)構(gòu)的整體剛度，但同時也增大了結(jié)構(gòu)自重；撐桿截面對結(jié)構(gòu)靜力學(xué)特性影響較小；對結(jié)構(gòu)前30階自振頻率研究發(fā)現(xiàn)，垂跨比、拉索截面和撐桿截面對其影響均較小，盡管板厚度對結(jié)構(gòu)基頻的影響較小，但其對結(jié)構(gòu)較高階自振頻率的影響較大，從第2階模態(tài)開始，隨著板厚度的增大，各階頻率基本呈遞增趨勢，隨著各參數(shù)的變化，結(jié)構(gòu)的各階振型基本保持一致。
［關(guān)鍵詞］預(yù)應(yīng)力；復(fù)合屋面結(jié)構(gòu)；弦支混凝土集成屋蓋結(jié)構(gòu)；靜力學(xué)特性； 自振特性Structural characteristics analysis and parameter discussion of cable supported concrete roof structure
Qiao Wentao, Chen Zhihua
(School of Civil Engineering, Tianjin University, Tianjin 300072, China)
Abstract:Based on the existing research results, the influence parameters on statics and natural vibration characteristics of the cable supported concrete roof structure were mainly investigated. The results indicate that the statics characteristics of the structure are improved by increasing sag-span ratio of the structure or the section of the cables. The rigidity of the structure is improved to a certain extent by increasing the thickness of slabs, but in the meantime, the weight of the structure is increased. The influence of the section of struts on the statics characteristics of the structure is weak. The first thirty natural frequencies of the structure are researched, and it is found that the influence of sag-span ratio, section of cables and section of struts on the structure are all weak. Although the influence of the thickness of slab on the first natural frequency is weak, this influence is noticeable for the higher natural frequencies. Starting from the second mode, each of natural frequencies increases as the thickness of slab increases, and every mode shape keep similar as every parameter involved above change.
Keywords:prestress; compound roof structure; cable supported concrete roof structure; statics characteristics; natural vibration characteristics
新世紀優(yōu)秀人才支持計劃（NCET
