本文關(guān)鍵詞： 張弦巨型網(wǎng)格結(jié)構(gòu) 模態(tài)分析 動(dòng)力特性 參數(shù)分析　出處：《防災(zāi)減災(zāi)工程學(xué)報(bào)》2016年05期 　論文類型：期刊論文

【摘要】：針對由張弦梁概念和巨型網(wǎng)格結(jié)構(gòu)組合而成的一種新型超大跨空間結(jié)構(gòu),通過模態(tài)分析研究結(jié)構(gòu)的動(dòng)力特性,首先將主體結(jié)構(gòu)單獨(dú)承載和子結(jié)構(gòu)協(xié)同承載兩種情況下張弦巨型網(wǎng)格結(jié)構(gòu)的前12階自振周期及相應(yīng)振型進(jìn)行比較,然后對結(jié)構(gòu)首階各向振型的出現(xiàn)次序及相應(yīng)自振周期進(jìn)行了主體結(jié)構(gòu)矢跨比、桁架梁高度、撐桿長度、預(yù)應(yīng)力大小等一系列參數(shù)分析并與未布索結(jié)構(gòu)作對比,詳細(xì)研究了結(jié)構(gòu)各方向剛度隨不同參數(shù)改變時(shí)的變化情況。結(jié)果表明,主體結(jié)構(gòu)單獨(dú)承載時(shí)結(jié)構(gòu)的縱向剛度最弱,子結(jié)構(gòu)的引入能夠極大地增強(qiáng)結(jié)構(gòu)水平縱向剛度;預(yù)應(yīng)力體系的引入可以顯著提高結(jié)構(gòu)的拱向及豎向剛度。為保證預(yù)應(yīng)力提高結(jié)構(gòu)豎向剛度的效果,主體結(jié)構(gòu)應(yīng)取較大矢跨比,且桁架梁高度的取值不宜太大。
[Abstract]:The dynamic characteristics of a new type of large span space structure, which is composed of the concept of beam string and the giant grid structure, are studied by modal analysis. Firstly, the first 12 order natural vibration periods and the corresponding vibration modes of Zhang Xian giant grid structure are compared under the condition of the main structure bearing alone and the substructure carrying together. Then a series of parameters, such as the rise-span ratio of the main structure, the height of the truss beam, the length of the bracing rod, the prestressing force and so on, are analyzed and compared with those of the uncabled structure. The variation of structural stiffness in different directions with different parameters is studied in detail. The results show that the longitudinal stiffness of the main structure is the weakest when the main structure is loaded alone. The introduction of substructure can greatly enhance the horizontal longitudinal stiffness of the structure. The introduction of prestressed system can significantly improve the arch and vertical stiffness of the structure. In order to ensure the effect of prestress to improve the vertical stiffness of the structure, the main structure should take a large rise-span ratio, and the value of the height of the truss beam should not be too large.
【作者單位】： 湖南大學(xué)土木工程學(xué)院;重慶大學(xué)土木工程學(xué)院;
【基金】：教育部博士點(diǎn)基金項(xiàng)目(0161110019) 湖南省高�？萍紕�(chuàng)新團(tuán)隊(duì)項(xiàng)目(湘財(cái)教指(2012)80號)資助
【分類號】：TU399
【正文快照】： 引言人類社會(huì)的發(fā)展,對空間結(jié)構(gòu)的跨度提出了更高的要求[1-2],而單一形式的結(jié)構(gòu)已無法滿足超大跨度的需求。為此,各國科技工作者不斷探索,將幾種單一形式的結(jié)構(gòu)進(jìn)行有機(jī)組合[3-4],以改善結(jié)構(gòu)受力性能,增加跨度。張弦梁結(jié)構(gòu)[5]是目前較成熟的一種組合結(jié)構(gòu),由撐桿、拉索及剛性壓，

本文編號：1460238