本文選題：門式剛架　切入點(diǎn)：張弦門式剛架　出處：《昆明理工大學(xué)》2017年碩士論文　論文類型：學(xué)位論文

【摘要】：隨著經(jīng)濟(jì)的發(fā)展、新材料出現(xiàn)和新技術(shù)的發(fā)明,門式剛架輕型鋼結(jié)構(gòu)的運(yùn)用范圍不斷擴(kuò)展。現(xiàn)在,跨度超過(guò)30m的門式剛架輕型鋼結(jié)構(gòu)建筑已很常見(jiàn)。雖然門式剛架輕型鋼結(jié)構(gòu)具有自重輕、傳力簡(jiǎn)明、施工安裝方便、抗震性能較好等優(yōu)點(diǎn),但也存在承載力低、剛度弱等缺點(diǎn),特別是當(dāng)跨度增大后,其承載力和剛度減弱非常明顯,失去了門式剛架結(jié)構(gòu)的優(yōu)越性。本文通過(guò)在門式剛架的斜梁下方增加鋼索與撐桿,鋼索連接在斜梁端并施加預(yù)應(yīng)力,將普通門式剛架結(jié)構(gòu)變成"張弦門式剛架結(jié)構(gòu)"。由于在結(jié)構(gòu)中施加了預(yù)應(yīng)力,不但可以提高結(jié)構(gòu)的承載力和剛度,還可以適當(dāng)增大結(jié)構(gòu)的跨度,有利于輕型門式剛架結(jié)構(gòu)的發(fā)展和應(yīng)用。當(dāng)門式剛架斜梁采用張弦結(jié)構(gòu)形式后,其結(jié)構(gòu)性能大為改善。從受力角度分析,普通門式剛架隨著跨度的增大,梁柱內(nèi)力峰值越來(lái)越大,要求截面也越來(lái)越大。而對(duì)于張弦門式剛架結(jié)構(gòu),由于張弦的預(yù)應(yīng)力作用,通過(guò)撐桿向斜梁施加了一個(gè)向上的力,這樣的技術(shù)調(diào)整會(huì)改善斜梁的內(nèi)力分布,減小其內(nèi)力峰值和斜梁撓度,從而減小斜梁截面或增大結(jié)構(gòu)跨度。同時(shí),張弦中的拉力,還可以改善門式剛架柱頂端受力情況,有利于門式剛架柱的設(shè)計(jì)。本文應(yīng)用幾何非線性有限元分析理論,結(jié)合實(shí)際工程運(yùn)用,對(duì)張弦門式剛架輕型鋼結(jié)構(gòu)進(jìn)行較系統(tǒng)的結(jié)構(gòu)性能分析,比較了普通門式剛架和張弦門式剛架兩種結(jié)構(gòu)體系的優(yōu)缺點(diǎn),并對(duì)張弦門式剛架結(jié)構(gòu)設(shè)計(jì)參數(shù)進(jìn)行了優(yōu)化比較,研究工作對(duì)張弦門式剛架結(jié)構(gòu)的工程應(yīng)用有一定的參考價(jià)值。
[Abstract]:With the development of economy, the emergence of new materials and the invention of new technology, the scope of application of light steel structure of portal frame is expanding. Light steel structures with span of more than 30 m are very common. Although the light steel structures of portal frames have the advantages of light weight, simple force transfer, convenient installation and good seismic performance, they also have the disadvantages of low bearing capacity and weak stiffness, etc. Especially when the span increases, the bearing capacity and stiffness of the portal frame structure decrease obviously, and the superiority of the portal frame structure is lost. In this paper, the cable is connected at the end of the oblique beam and the prestressing force is applied by adding steel cable and bracing rod under the oblique beam of the portal frame. The ordinary portal frame structure is changed into "Zhang Xian portal frame structure". By applying prestress to the structure, not only the bearing capacity and stiffness of the structure can be increased, but also the span of the structure can be appropriately increased. It is beneficial to the development and application of light portal frame structure. When the oblique beam of portal frame adopts Zhang Xian structure, its structural performance is greatly improved. From the point of view of force, the common portal frame increases with the span. The peak value of Liang Zhu's internal force is increasing, and the section required is also becoming larger and larger. And for Zhang Xian's portal frame structure, due to the prestressing force of Zhang Xian, an upward force is exerted through the braced syncline beam. Such technical adjustment will improve the internal force distribution of the oblique beam, reduce its peak internal force and deflection of the inclined beam, thereby reducing the cross-section of the oblique beam or increasing the span of the structure. At the same time, the tension in Zhang Xian can also improve the stress on the top of the portal frame column. In this paper, the geometrical nonlinear finite element analysis theory is used to analyze the structural performance of Zhang Xian portal frame light steel structure by using the theory of geometric nonlinear finite element analysis and practical engineering application. The merits and demerits of the common portal frame and Zhang Xian portal frame are compared, and the structural design parameters of Zhang Xian portal frame are optimized and compared. The research work has a certain reference value for the engineering application of Zhang Xian portal frame structure.
【學(xué)位授予單位】：昆明理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TU392.5

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