本文選題：土木工程施工 + 懸挑腳手架　； 參考：《鄭州大學》2014年碩士論文

【摘要】：懸挑腳手架由于其在經(jīng)濟性、施工可行性和安全性等方面的技術(shù)優(yōu)勢，在高層建筑中被廣泛應(yīng)用。由于懸挑腳手架在設(shè)計和施工中的理論依據(jù)不足，多按施工經(jīng)驗進行設(shè)計和施工，對于懸挑腳手架的整體受力性能研究也偏少�，F(xiàn)行規(guī)范規(guī)定，懸挑腳手架可以用鋼絲繩（拉索）進行卸載，但是鋼絲繩不參與懸挑架的受力分析，僅作為一種安全儲備。本文對懸挑腳手架進行整體受力性能試驗研究，驗證鋼絲繩的卸載作用，，認為當鋼絲繩適當施加預應(yīng)力時，可以參與懸挑腳手架的受力計算。 結(jié)合鄭州市“昌建譽峰”項目，在懸挑腳手架的施工過程中，對懸挑型鋼、鋼絲繩和連墻件的內(nèi)力進行現(xiàn)場監(jiān)測，并對實測數(shù)據(jù)進行分析。在此基礎(chǔ)上，建立懸挑架的理論計算模型，假設(shè)鋼絲繩可以承擔外加荷載，得到鋼絲繩和懸挑型鋼端部受力，并與試驗值進行對比。建立懸挑腳手架的二維計算模型，進行有限元模擬計算。然后，改變懸挑架設(shè)計參數(shù)，得到一系列懸挑型鋼端部位移。綜合理論計算和模擬分析結(jié)果，認為鋼絲繩在可靠施加預應(yīng)力的條件下，可以承擔35%-40%的外加荷載，其余的外加荷載由懸挑型鋼承擔，由此建立懸挑架的計算模型，即同時考慮鋼絲繩的卸載作用和懸挑型鋼作用的超靜定“索梁共同工作模型”。根據(jù)索梁共同工作模型，懸挑架設(shè)計中懸挑梁截面更加合理，懸挑梁錨固端樓板的局部承壓驗算也更容易滿足。鋼絲繩可以承擔外加荷載的前提條件是，在施工過程中鋼絲繩始終保持適當?shù)念A拉力狀態(tài)。所以在高層建筑懸挑腳手架的施工過程中，要定期檢查鋼絲繩的拉緊狀態(tài)，使鋼絲繩在整個施工過程中一直保持張緊狀態(tài)，和懸挑型鋼一起承擔外加荷載。
[Abstract]:Cantilever scaffolding is widely used in high-rise buildings because of its technical advantages in economy, construction feasibility and safety. Because of the lack of theoretical basis in the design and construction of the cantilever scaffold, the design and construction of cantilever scaffold are mostly carried out according to the construction experience, and the research on the overall mechanical performance of the cantilever scaffold is also less. The current code stipulates that the cantilever scaffold can be unloaded by wire rope (cable), but the wire rope does not participate in the force analysis of the cantilever, so it is only a kind of safety reserve. In this paper, the experimental study on the overall mechanical behavior of the cantilever scaffold is carried out to verify the unloading effect of the wire rope. It is considered that the stress calculation of the cantilever scaffold can be participated when the wire rope is properly prestressed. Combined with the "Changjian Xianfeng" project in Zhengzhou City, the internal forces of cantilever steel, wire rope and wall parts were monitored in the construction process of cantilever scaffold, and the measured data were analyzed. On this basis, the theoretical calculation model of the cantilever frame is established. It is assumed that the wire rope can bear the external load, and the force on the end of the steel wire rope and cantilever steel is obtained, and the results are compared with the experimental values. The two-dimensional calculation model of cantilever scaffold was established, and the finite element simulation was carried out. Then, by changing the design parameters of the cantilever frame, a series of cantilever steel end positions are obtained. Synthesizing the theoretical calculation and simulation analysis results, it is concluded that under the condition of reliable prestressing, the wire rope can bear 35% to 40% of the external load, and the rest of the external load is borne by the cantilevered steel, so the calculation model of the cantilever frame is established. That is, the statically indeterminate "cable-beam working model" which considers both the unloading effect of wire rope and the action of cantilever steel. According to the joint work model of cable and beam, the section of cantilever beam is more reasonable in the design of cantilever frame, and the local pressure checking calculation of anchoring end floor slab of cantilever beam is easier to satisfy. The precondition for the wire rope to bear the external load is that the wire rope always maintains the proper pretension state during the construction process. Therefore, in the construction process of cantilever scaffold of high-rise building, the tension state of wire rope should be checked regularly, so that the wire rope can keep tensioning state all the time during the whole construction process, and bear the external load together with the cantilever steel.
【學位授予單位】：鄭州大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：TU731.2

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本文編號：1928982