本文選題：大跨度 + 鋼桁架　； 參考：《河北工程大學》2014年碩士論文

【摘要】：本文從大跨度鋼桁架結(jié)構(gòu)出發(fā)，通過運用PKPM軟件的STS模塊并且結(jié)合相關(guān)規(guī)范和設(shè)計經(jīng)驗對其進行建模、分析和優(yōu)化。 本文從實際案例出發(fā)，首先對屋架的選型和支撐體系進行設(shè)計，運用軟件對一榀鋼桁架進行建模，分析和節(jié)點驗算。然后提出了四個優(yōu)化方案：縮短下弦節(jié)間長度、在經(jīng)驗限值范圍內(nèi)增大和減小屋架的端部高度和跨度的比值、將屋架桿件變?yōu)榉戒摴�，再次運用軟件建模與分析，通過前后對比得出了以下結(jié)論： （1）下弦節(jié)間長度從6m變?yōu)?m，節(jié)點荷載有所減小，但是并沒有有效的減小桿件截面的尺寸，反而使結(jié)構(gòu)內(nèi)力有所增大，結(jié)構(gòu)的豎向位移也加大，，總的用鋼量也增大。從施工上來說，桿件數(shù)量和節(jié)點增多，施工不便。 （2）增大端部高度，會提高結(jié)構(gòu)豎向剛度，但是桿件截面比原始設(shè)計的截面略有增大，結(jié)構(gòu)內(nèi)力大，總用鋼量大。從施工上來說，端部高度增大勢必會增大結(jié)構(gòu)部分桿件的尺寸，從桿件的制作、運輸還是安裝都會帶來不便。 （3）減小端部高度，結(jié)構(gòu)豎向剛度減小，內(nèi)力增大，桿件截面尺寸和原始設(shè)計大致一樣，但是結(jié)構(gòu)端斜桿和連接垂直支撐的豎腹桿的截面能有效的減小，用鋼量大幅度的減少。同時減小端部高度也會使結(jié)構(gòu)部分桿件尺寸有所減小，方便施工。由此可見減小端部高度對于傳統(tǒng)的桿件采用雙角鋼組合形式的鋼屋架是一個切實可行的優(yōu)化方案。 （4）方鋼管桁架無論從受力、施工、還是用鋼量都占有明顯的優(yōu)勢。
[Abstract]:Based on the large-span steel truss structure, this paper models, analyzes and optimizes the structure by using STS module of PKPM software and combining relevant specifications and design experience. In this paper, starting from the actual cases, the selection of roof truss and supporting system are designed, and a steel truss is modeled, analyzed and checked by software. Then four optimization schemes are proposed: shortening the length of the lower chord Internode, increasing and reducing the ratio of the end height and span of the roof truss within the range of the empirical limit, changing the truss member into a square steel tube, and using software to model and analyze again. The conclusions are as follows: (1) when the length of the lower chord is changed from 6 m to 5 m, the load of the joint decreases, but the size of the section of the member is not effectively reduced, but the internal force of the structure is increased. The vertical displacement of the structure is also increased, and the total amount of steel used is also increased. In construction, the number of members and joints increase, and the construction is inconvenient. Increasing the height of the end part will increase the vertical stiffness of the structure, but the cross section of the member is slightly larger than the original design, the internal force of the structure is large, and the total amount of steel used is large. From the construction point of view, the increase of the end height will inevitably increase the size of the members of the structure, and it will be inconvenient to make, transport or install the members. 3) reduce the height of the end, reduce the vertical stiffness of the structure, and increase the internal force. The cross section size of the member is approximately the same as the original design, but the cross section of the end inclined bar and the vertical web rod connected to the vertical support can be reduced effectively, and the amount of steel used is greatly reduced. At the same time, reducing the height of the end part of the structure will also reduce the size of the bar, easy construction. It can be seen that reducing the end height is a feasible and feasible optimization scheme for the traditional steel truss with double angle steel combination. The square steel pipe truss has obvious advantages both in force construction and steel consumption.
【學位授予單位】：河北工程大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：TU393.3

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