本文關(guān)鍵詞：超高性能混凝土在肋拱橋中的應(yīng)用　出處：《長(zhǎng)沙理工大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 超高性能混凝土肋拱橋 RPC 力學(xué)性能 動(dòng)力特性 靜力特性 穩(wěn)定性

【摘要】：超高性能混凝土是一種新型的復(fù)合材料,也叫活性粉末混凝土(Reactive Powder Concrete,RPC),對(duì)比普通混凝土來(lái)說(shuō),它具有超高強(qiáng)度、高韌性、高抗?jié)B性和耐久性好等優(yōu)點(diǎn)。實(shí)際工程中使用超高性能混凝土材料,可達(dá)到減小構(gòu)件截面尺寸,減輕結(jié)構(gòu)自重,節(jié)省材料用量,增長(zhǎng)材料使用壽命的效果。超高性能混凝土最顯著的優(yōu)點(diǎn)是抗壓強(qiáng)度極高,而拱體系結(jié)構(gòu)屬于壓彎構(gòu)件,充分利用了超高性能混凝土抗壓強(qiáng)度高的特點(diǎn),對(duì)于RPC肋拱橋優(yōu)異的受力性能非常值得研究探討。在國(guó)內(nèi)外對(duì)超高性能混凝土展開(kāi)的研究和應(yīng)用背景下,本文對(duì)超高性能混凝土在肋拱橋中的應(yīng)用進(jìn)行了嘗試性的探討和研究,證明了超高性能混凝土應(yīng)用到肋拱橋中的可行性和優(yōu)越性。其主要內(nèi)容和相應(yīng)的研究成果如下：(1)用ANSYS軟件對(duì)RPC矩形截面拱肋進(jìn)行優(yōu)化設(shè)計(jì)分析。優(yōu)化設(shè)計(jì)以混凝土材料和拱肋截面尺寸為設(shè)計(jì)變量,在一定的撓度和應(yīng)力范圍內(nèi),使得拱肋體積取得最小值,得出矩形截面拱肋的最優(yōu)截面尺寸,其高度和寬度約為普通混凝土的0.80h倍和0.833b;(2)對(duì)RPC肋拱橋和普通混凝土肋拱橋進(jìn)行Midas建模,研究了兩者的靜力性能,對(duì)比RPC肋拱橋和普通混凝土肋拱橋的應(yīng)力、彎矩、軸力、剪力的大小,得出RPC肋拱橋由于截面尺寸的減小,其拱肋應(yīng)力要比普通混凝土的要高出20%～34%,而各荷載工況下RPC肋拱橋的彎矩、軸力、剪力要比普通混凝土肋拱橋的要小,減小大約14%～5%；(3)對(duì)RPC肋拱橋和普通混凝土肋拱橋進(jìn)行動(dòng)力特性分析,對(duì)比研究?jī)烧叩淖哉耦l率和振型,得出截面尺寸減小后RPC肋拱橋前十階自振頻率比普通混凝土肋拱橋的要小,減小1%～15%；(4)通過(guò)比較兩者拱肋豎向位移,研究了它們的剛度,得出RPC肋拱橋拱肋各控制截面的豎向位移要比普通混凝土的要大,前者是后者的1.01～1.12倍,證明RPC肋拱橋的剛度比普通混凝土肋拱橋的要小,并在理論上簡(jiǎn)要分析了RPC肋拱橋的抗裂性,得出其抗裂性得到增強(qiáng)；(5)對(duì)RPC肋拱橋和普通混凝土肋拱橋進(jìn)行了穩(wěn)定性分析,對(duì)比了它們穩(wěn)定系數(shù)的大小,得出RPC肋拱橋由于結(jié)構(gòu)尺寸的減小使得其穩(wěn)定系數(shù)減小,減小23%～33%。
[Abstract]:Ultra-high performance concrete (UHPC) is a new type of composite material, also called reactive Powder concrete (RPC), compared with ordinary concrete. It has the advantages of ultra-high strength, high toughness, high impermeability and good durability. The use of ultra-high performance concrete material in practical engineering can reduce the section size of members, reduce the weight of the structure, and save the amount of materials. The most significant advantage of UHPC is that the compressive strength is very high, while the arch system structure belongs to the compression and bending member, which makes full use of the high compressive strength of UHPC. The excellent mechanical performance of RPC rib arch bridge is worth studying and discussing. In the research and application background of UHPC at home and abroad. In this paper, the application of ultra-high performance concrete in rib arch bridge is discussed and studied. The feasibility and superiority of UHPC applied to rib arch bridge are proved. The main contents and corresponding research results are as follows: 1). The optimum design of RPC rectangular section arch rib is analyzed by ANSYS software. The concrete material and arch rib section size are taken as the design variables in the optimization design. In a certain range of deflection and stress, the volume of arch rib is minimized, and the optimum section size of rectangular section arch rib is obtained. The height and width of arch rib are about 0.80h and 0.833bcompared with ordinary concrete. The static behavior of RPC rib arch bridge and ordinary concrete rib arch bridge is studied. The stress, bending moment and axial force of RPC rib arch bridge and ordinary concrete rib arch bridge are compared. Because of the decrease of section size, the stress of RPC rib arch bridge is 20% higher than that of ordinary concrete, and the bending moment and axial force of RPC rib arch bridge under different load conditions. The shear force is smaller than that of the ordinary concrete rib arch bridge. The dynamic characteristics of RPC rib arch bridge and ordinary concrete rib arch bridge are analyzed, and the natural vibration frequency and vibration mode of the two bridges are compared and studied. It is concluded that the natural vibration frequency of the first ten steps of the RPC rib arch bridge is smaller than that of the ordinary concrete rib arch bridge after the section size is reduced, and the frequency of the first ten steps of the RPC rib arch bridge is reduced by 15%. 4) by comparing the vertical displacement of the two arch ribs and studying their stiffness, it is concluded that the vertical displacement of each control section of the arch rib of RPC rib bridge is larger than that of ordinary concrete. The former is 1.01 ~ 1.12 times of the latter, which proves that the stiffness of RPC rib arch bridge is smaller than that of ordinary concrete rib arch bridge, and briefly analyzes the crack resistance of RPC rib arch bridge in theory. It is concluded that the crack resistance is enhanced. The stability of RPC rib arch bridge and ordinary concrete rib arch bridge is analyzed, and the stability coefficient of RPC rib arch bridge is obtained by comparing their stability coefficients. Reduce the number 23 to 33.
【學(xué)位授予單位】：長(zhǎng)沙理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：U444

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