【摘要】：輕型鋼桁網(wǎng)支架是一種用在中小跨徑拱橋施工中的新型支架,具有質(zhì)量輕,取材廣泛,制作工藝簡(jiǎn)單,施工便捷和造價(jià)低廉等優(yōu)點(diǎn),適用于對(duì)基礎(chǔ)要求較高的中小跨徑現(xiàn)澆混凝土拱或預(yù)制拼接鋼筋混凝土拱。它的推廣應(yīng)用可以縮短施工時(shí)間,降低施工成本,帶來(lái)巨大的社會(huì)經(jīng)濟(jì)效益。但是由于此施工方法屬于較新的工藝,因此缺少相關(guān)的理論和實(shí)踐經(jīng)驗(yàn)作為指導(dǎo),因此對(duì)輕型鋼桁網(wǎng)架做較為深入的研究,對(duì)其推廣應(yīng)用是十分必要的。本文針對(duì)浙江省湖州市長(zhǎng)田漾大橋的拱圈施工,對(duì)輕型鋼桁網(wǎng)支架做了實(shí)踐與理論相結(jié)合的研究,主要包括以下幾個(gè)內(nèi)容：(1)通過(guò)對(duì)結(jié)構(gòu)進(jìn)行理論分析,確定了檢驗(yàn)結(jié)構(gòu)是否能夠滿(mǎn)足施工要求的標(biāo)準(zhǔn)。結(jié)構(gòu)檢驗(yàn)包括強(qiáng)度驗(yàn)算,剛度驗(yàn)算與穩(wěn)定性驗(yàn)算三個(gè)方面。其中由于支架是由單榀鋼拱架通過(guò)橫向支撐聯(lián)系成一個(gè)整體,通過(guò)在節(jié)點(diǎn)處綁扎鋼管,將拱圈施工荷載轉(zhuǎn)化為鋼拱架面內(nèi)節(jié)點(diǎn)荷載,進(jìn)一步將鋼桁網(wǎng)架的強(qiáng)度驗(yàn)算簡(jiǎn)化為單榀鋼拱架的強(qiáng)度驗(yàn)算。(2)通過(guò)對(duì)施工過(guò)程中的鋼桁網(wǎng)架的主要節(jié)點(diǎn)和主要受力桿件分別進(jìn)行位移監(jiān)測(cè)和應(yīng)力監(jiān)測(cè),同時(shí)利用大型有限元分析軟件Midas Civil建立相應(yīng)的有限元模型,將監(jiān)測(cè)結(jié)果與有限元模型計(jì)算結(jié)果進(jìn)行對(duì)比分析,結(jié)果表明,計(jì)算結(jié)果與監(jiān)測(cè)結(jié)果擬合較好,該有限元模型可以反映用在該施工中的鋼桁網(wǎng)架的受力狀態(tài),因此可以將該有限元模型作為進(jìn)一步深入研究的理論模型。(3)利用校驗(yàn)正確的有限元模型進(jìn)行完整結(jié)構(gòu)的靜力分析和屈曲分析,檢驗(yàn)輕型鋼桁網(wǎng)架的強(qiáng)度,剛度和穩(wěn)定性是否能夠滿(mǎn)足施工要求,為輕型鋼桁網(wǎng)架的推廣應(yīng)用提供了理論基礎(chǔ)。(4)針對(duì)長(zhǎng)田漾大橋施工過(guò)程中出現(xiàn)了由于現(xiàn)場(chǎng)施工偶然因素造成的結(jié)構(gòu)中的個(gè)別桿件失去承載力的情況,為了防止由于桿件出現(xiàn)失效破壞,而導(dǎo)致結(jié)構(gòu)發(fā)生倒塌,因此對(duì)結(jié)構(gòu)進(jìn)行倒塌分析。本文選擇12種初始破壞狀態(tài)進(jìn)行倒塌分析,分析結(jié)果表明,在12種初始破壞狀態(tài)下,針對(duì)長(zhǎng)田漾大橋拱圈施工工序的輕型鋼桁網(wǎng)支架不會(huì)發(fā)生倒塌破壞。但是由于鋼桁網(wǎng)架的桿件眾多,因此有必要對(duì)所有桿件進(jìn)行深入分析,確保結(jié)構(gòu)在現(xiàn)場(chǎng)施工偶然作用下不會(huì)發(fā)生倒塌破壞。經(jīng)過(guò)以上分析,最后提出結(jié)論,輕型鋼桁網(wǎng)支架可以在中小跨徑拱橋施工中推廣應(yīng)用,本文的理論分析具有一定的針對(duì)性,可以作為鋼桁網(wǎng)架推廣應(yīng)用理論分析的基礎(chǔ),但是對(duì)應(yīng)不同的施工工序和施工參數(shù),需要重新檢驗(yàn)結(jié)構(gòu)的安全性,并對(duì)結(jié)構(gòu)進(jìn)行適當(dāng)?shù)膬?yōu)化設(shè)計(jì)。
[Abstract]:Light steel truss mesh support is a new type of support used in the construction of medium and small span arch bridge. It has the advantages of light weight, wide selection of materials, simple manufacturing technology, convenient construction and low cost, etc. It is suitable for medium and small span cast-in-place concrete arch or prefabricated reinforced concrete arch. Its popularization and application can shorten construction time, reduce construction cost and bring huge social and economic benefits. However, because this construction method is a relatively new technology, it is lack of relevant theory and practical experience to guide it. Therefore, it is necessary to do more in-depth research on the light steel truss grid, and its popularization and application are very necessary. Aiming at the arch circle construction of Tianyang Bridge of Huzhou Mayor of Zhejiang Province, this paper studies the combination of practice and theory of light steel truss mesh support, which mainly includes the following contents: (1) through theoretical analysis of the structure, It is determined whether the structure can meet the construction requirements. Structural inspection includes strength check, stiffness check and stability check. Because the support is connected into a whole by a single steel arch frame through transverse bracing, the construction load of the arch ring is transformed into the in-plane joint load of the steel arch frame by binding the steel pipe at the joint. Furthermore, the strength checking calculation of steel truss grid is simplified as that of a single steel arch frame. (2) displacement monitoring and stress monitoring are carried out on the main joints and the main stress members of the steel truss grid in the construction process. At the same time, the finite element model is established by using the large-scale finite element analysis software Midas Civil, and the results of monitoring and finite element model calculation are compared and analyzed. The results show that the calculated results fit well with the monitoring results. The finite element model can reflect the stress state of the steel truss grid used in the construction. Therefore, the finite element model can be used as the theoretical model for further research. (3) static analysis and buckling analysis of the complete structure are carried out by using the correct finite element model to test the strength of the light steel truss grid. Whether stiffness and stability can meet construction requirements, It provides a theoretical basis for the popularization and application of light steel truss grids. (4) in view of the loss of bearing capacity of individual members in the structure caused by accidental factors in site construction during the construction of Changtian Yang Bridge, In order to prevent the structure from collapsing due to the failure and failure of the member, the collapse analysis of the structure is carried out. In this paper, 12 kinds of initial failure states are selected for collapse analysis. The results show that under 12 initial failure states, the light steel truss mesh support for the arch ring construction process of Changtian Yang Bridge will not collapse and destroy. However, due to the large number of members of the steel truss grid, it is necessary to make a thorough analysis of all the members so as to ensure that the structure will not collapse and destroy under the accidental action of the field construction. After the above analysis, the conclusion is put forward that light steel truss mesh support can be popularized and applied in the construction of middle and small span arch bridge. The theoretical analysis in this paper has some pertinence and can be used as the basis of the theoretical analysis for the popularization and application of steel truss grid. However, for different construction procedures and construction parameters, it is necessary to re-examine the safety of the structure and carry out appropriate optimization design of the structure.
【學(xué)位授予單位】：東南大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類(lèi)號(hào)】：U445.4;U448.22

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