【摘要】：本文將活性粉末混凝土(Reactive Powder Concrete,簡稱RPC)材料的優(yōu)點(diǎn)與箱型截面梁的優(yōu)點(diǎn)相結(jié)合,提出了大跨度整孔預(yù)制架設(shè)48米RPC簡支箱梁的結(jié)構(gòu)構(gòu)想,主要闡述以下三個(gè)方面的內(nèi)容： (1)對整孔預(yù)制架設(shè)48米RPC簡支箱梁進(jìn)行了變形、應(yīng)力、抗裂性計(jì)算分析；對其極限承載力進(jìn)行理論計(jì)算,并通過有限元軟件分析了跨中截面撓度隨荷載等級變化曲線、跨中截面上緣應(yīng)力及下緣應(yīng)力隨荷載等級變化曲線；求解了48米RPC簡支箱梁的自振頻率和振型；與32米普通混凝土箱梁進(jìn)行經(jīng)濟(jì)性對比分析。 (2)進(jìn)行了整孔預(yù)制架設(shè)48米RPC簡支箱梁的預(yù)制工藝分析,包括RPC的材料及配合比、攪拌、運(yùn)輸、澆筑、振搗工藝及養(yǎng)護(hù)制度；分析了普通混凝土與RPC共同作用性能；為今后大跨度RPC簡支箱梁在實(shí)際工程中的應(yīng)用提供了參考。 (3)基于現(xiàn)行的32米運(yùn)架設(shè)備,提出了整孔架設(shè)48米RPC簡支箱梁的運(yùn)架設(shè)備改造方案。 通過上述計(jì)算與分析,驗(yàn)證了大跨度整孔預(yù)制架設(shè)48米RPC簡支箱梁結(jié)構(gòu)的可行性。采用RPC設(shè)計(jì)整孔預(yù)制架設(shè)48米簡支箱梁將大幅度減小結(jié)構(gòu)自重,其力學(xué)性能滿足現(xiàn)有規(guī)范的要求：無需重新設(shè)計(jì)和研制大噸位運(yùn)架設(shè)備,只需對現(xiàn)有運(yùn)架設(shè)備進(jìn)行簡單的改造和加固,就能夠?qū)崿F(xiàn)整孔預(yù)制48米RPC簡支箱梁的架設(shè),不會造成既有設(shè)備的閑置和浪費(fèi)。 本文作為一種嘗試性研究,為今后RPC在工程領(lǐng)域的應(yīng)用和研究提供參考。
[Abstract]:In this paper, the advantages of reactive powder concrete (Reactive Powder Concrete,) material and box section beam are combined, and the structure conception of 48 m RPC simply supported box girder with long span whole hole precast is put forward. The main contents of this paper are as follows: (1) the deformation, stress and crack resistance of 48 m RPC simply supported box girder are calculated and analyzed. The theoretical calculation of the ultimate bearing capacity is carried out, and the curves of the deflection of the middle span with the load grade, the upper edge stress and the lower edge stress of the span middle section with the load grade are analyzed by finite element software. The natural vibration frequency and mode shape of 48m RPC simple-supported box girder are solved and compared with 32-meter ordinary concrete box girder. (2) the prefabrication process of 48 m RPC simply supported box girder is analyzed, including the material and mix ratio of RPC, mixing, transportation, pouring, vibrating technology and maintenance system, and the interaction performance between ordinary concrete and RPC is analyzed. It provides a reference for the application of long-span RPC simple-supported box girder in practical engineering in the future. (3) based on the existing 32-meter carrier equipment, the paper puts forward the modification scheme of 48-meter RPC simply supported box girder with the whole hole. Through the above calculation and analysis, the feasibility of 48 m RPC simply supported box girder structure with long span full hole prefabrication is verified. The design of prefabricated 48 m simply supported box girder with full hole with RPC will greatly reduce the weight of the structure, and its mechanical properties can meet the requirements of the existing codes: there is no need to redesign and develop the equipment for large tonnage transportation frame. As long as the existing equipment is simply modified and strengthened, the whole hole prefabricated 48 m RPC simply supported box girder can be built, and the existing equipment will not be idle or wasted. As a tentative study, this paper provides a reference for the application and research of RPC in the engineering field in the future.
【學(xué)位授予單位】：北京交通大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：U442.5;U448.213

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