本文選題：筒倉倉頂　切入點：旋轉(zhuǎn)盤口　出處：《天津大學(xué)》2014年碩士論文　論文類型：學(xué)位論文

【摘要】：隨著經(jīng)濟的發(fā)展,筒倉結(jié)構(gòu)因其貯存方便、貯存容量大得到越來越廣泛的應(yīng)用。在筒倉的設(shè)計和施工過程中,倉頂施工是其中的重點和難點。目前國內(nèi)外學(xué)者對筒倉倉頂支撐平臺的研究多集中在滿堂架形式,或空間桁架加中心井架形式,仍需依賴豎向支撐,施工安裝不便,因此有必要對倉頂支撐平臺展開詳細的研究。本文提出了一種新型旋轉(zhuǎn)盤口式桁架支撐平臺,該體系形式簡單、傳力路徑明確、組裝拆卸方便、可重復(fù)利用,采用空間水平支撐,擺脫了豎向支撐,能彌補其他支撐平臺的不足,大大縮短了工期,提高了安全保障。對新型旋轉(zhuǎn)盤口式桁架構(gòu)件進行試驗,包括桿件試驗、球節(jié)點試驗,分析構(gòu)件的承載力和失穩(wěn)情況。結(jié)果顯示受拉試件組承載力最大,斷面發(fā)生頸縮現(xiàn)象,承載力滿足要求;三組壓縮桿件均發(fā)生不同程度的壓彎失穩(wěn),壓彎失穩(wěn)發(fā)生鋼管中間部位。三組受壓球節(jié)點試件,屈曲位置發(fā)生在球節(jié)點與鋼管鏈接的焊縫附近;所有試件的承載力均滿足設(shè)計和使用要求,可用于桁架結(jié)構(gòu)。對21m直徑新型旋轉(zhuǎn)盤口式桁架進行足尺試驗,并根據(jù)試驗進行有限元分析,驗證桁架承載力,探尋桁架變形規(guī)律,為新型旋轉(zhuǎn)盤口式桁架的推廣使用和施工提供依據(jù)。結(jié)果表明21m直徑新型旋轉(zhuǎn)盤口式桁架在周邊設(shè)置一圈拉索情況下所能承受最大荷載為2260kN;桿件連接間隙對桁架撓度和桿件應(yīng)力影響較大,分析中采用剛度折減來考慮連接間隙等因素的影響;有限元分析結(jié)果表明旋轉(zhuǎn)盤口式扣件桁架計算值與試驗值吻合較好,說明建模和計算方法行之有效。根據(jù)21m直徑新型旋轉(zhuǎn)盤口式桁架進行足尺試驗和有限元分析模型,對30m直徑新型旋轉(zhuǎn)盤口式桁架進行有限元分析,研究其能否滿足施工要求,并對其行進施工安全分析。結(jié)果表明30m直徑的筒倉可以采用旋轉(zhuǎn)盤口桁架支撐平臺進行倉頂施工,平臺承載力滿足施工要求;對結(jié)構(gòu)進行施工安全分析,在第二階段施工中當(dāng)應(yīng)力最大的拉索連續(xù)失效時,結(jié)構(gòu)仍能滿足承載力要求;在第三階段施工中當(dāng)應(yīng)力最大的拉索連續(xù)失效時,結(jié)構(gòu)仍具有較高承載力,所以對第三圈拉索進行優(yōu)化設(shè)計,經(jīng)對比分析發(fā)現(xiàn),第三圈拉索為12根時為最優(yōu)方案,既能保證結(jié)構(gòu)有一定的安全性,又節(jié)省材料方便施工。
[Abstract]:With the development of economy, silos have been widely used in the design and construction of silos because of their convenient storage and large storage capacity. The construction of silo roof is one of the key and difficult points. At present, most of the researches on silo roof supporting platform are concentrated in the form of full roof frame or space truss plus central Derrick, which still depend on vertical support, so it is inconvenient to install in construction. Therefore, it is necessary to carry out detailed research on the roof support platform. In this paper, a new type of rotary disc mouth truss support platform is proposed, which has the advantages of simple form, clear force transfer path, convenient assembly and disassembly, and can be reused. The horizontal space support is used to get rid of the vertical support, which can make up for the deficiency of other supporting platforms, shorten the time limit greatly, and improve the safety and security. The test of the new type of rotating disc mouth type truss member, including the test of the bar and the test of the ball joint, is carried out. The results show that the bearing capacity of the tensile specimen group is the largest, the necking of the section occurs, the bearing capacity meets the requirements, and the three groups of compression members have different degrees of compression and bending instability. The buckling position of three groups of compressed spherical joints occurs near the weld of the connection between the ball joint and the steel pipe, and the bearing capacity of all the specimens meets the requirements of design and application. It can be used in truss structure. The full-scale test of 21m diameter rotating diskhead truss is carried out, and the finite element analysis is carried out according to the test to verify the bearing capacity of truss, and to find out the deformation law of truss. The results show that the maximum load of 21m diameter new rotary diskhead truss is 2260kNwhen a circle of cable is installed around the truss, and the connection clearance of the member to the truss is provided. The deflection and the stress of the bar are greatly affected. In the analysis, stiffness reduction is used to consider the influence of the connection clearance, and the finite element analysis results show that the calculated value of the rotary disc opening fastener truss is in good agreement with the experimental value. According to the full-scale test and finite element analysis model of the 21m diameter new rotary diskhead truss, the paper makes a finite element analysis of the 30m diameter new rotary diskhead truss, and studies whether it can meet the construction requirements. The results show that the silo with 30m diameter can be constructed by rotating disc mouth truss support platform, the bearing capacity of the platform can meet the construction requirements, and the construction safety of the structure can be analyzed. In the second stage of construction, the structure can still meet the bearing capacity requirements when the cable with the greatest stress fails continuously, and in the third stage, when the cable with the greatest stress fails continuously, the structure still has a higher bearing capacity. Therefore, the optimum design of the third circle cable is found by comparison and analysis. It is found that the optimal scheme is 12 cables in the third circle, which can not only guarantee the safety of the structure, but also save materials for construction.
【學(xué)位授予單位】：天津大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：TU731

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