【摘要】：為了優(yōu)化空腹式連續(xù)剛構(gòu)橋的關(guān)鍵設(shè)計(jì)參數(shù),提高經(jīng)濟(jì)效益,以貴州水盤高速北盤江大橋?yàn)楸尘?根據(jù)上部結(jié)構(gòu)混凝土、普通鋼筋和預(yù)應(yīng)力鋼束的工程量及其造價(jià)提出延米經(jīng)濟(jì)指標(biāo)的概念,從工程造價(jià)的經(jīng)濟(jì)性角度研究了空腹式連續(xù)剛構(gòu)橋跨徑和根部梁高這2個(gè)關(guān)鍵結(jié)構(gòu)設(shè)計(jì)參數(shù)的取值范圍。采用有限元參數(shù)分析法研究了在橋梁主跨L=210,250,290,330,370m,且根部梁高分別為L/5、L/6、L/7、L/8、L/9、L/10、L/11等工況下,上部結(jié)構(gòu)延米經(jīng)濟(jì)指標(biāo)的變化規(guī)律。研究表明:混凝土造價(jià)的比重隨著根部梁高的減小和主跨的增大而不斷降低,預(yù)應(yīng)力鋼束造價(jià)的比重與混凝土剛好相反;上部結(jié)構(gòu)的延米經(jīng)濟(jì)指標(biāo)隨根部梁高的減小先降后增,根部梁高在L/8~L/7范圍內(nèi)取值時(shí),延米經(jīng)濟(jì)指標(biāo)最低;空腹式連續(xù)剛構(gòu)橋的經(jīng)濟(jì)跨徑約為210~290m,超過300m以后,上部結(jié)構(gòu)的經(jīng)濟(jì)性將顯著降低。
[Abstract]:In order to optimize the key design parameters of the hollow continuous rigid frame bridge and to improve the economic benefit, based on the background of the Guizhou Shuipan High Speed Beipanjiang Bridge, according to the superstructure concrete, The concept of Yanmi economic index is put forward for engineering quantity and cost of ordinary steel bar and prestressed steel bundle. The range of design parameters of span and root beam height of hollow continuous rigid frame bridge is studied from the point of view of engineering cost. By means of finite element parameter analysis method, the variation rule of the superstructure's economic index of the superstructure under the conditions of the main span of the bridge is 210250290330370m and the beam height at the root of the bridge is L ~ (5), L ~ (6), L ~ (7), L ~ (8), L ~ (9), L ~ (10), L ~ (11) and so on, are studied in this paper. The results show that the specific gravity of the concrete cost decreases with the decrease of the root beam height and the increase of the main span, and the specific gravity of the prestressed steel bundle is just opposite to that of the concrete. With the decrease of the root beam height, the economic index of the superstructure decreased first and then increased. When the root beam height was in the range of L/8~L/7, the economic index was the lowest. The economic span of the hollow continuous rigid frame bridge is about 210 m ~ 290 m, and when the span is more than 300 m, the economy of the superstructure will be greatly reduced.
【作者單位】： 重慶交通大學(xué)土木工程學(xué)院;中交第二公路勘察設(shè)計(jì)研究院有限公司;
【基金】：重慶市基礎(chǔ)與前沿研究計(jì)劃項(xiàng)目(cstc2015jcyjA30014) 交通運(yùn)輸部應(yīng)用基礎(chǔ)研究計(jì)劃項(xiàng)目(2014319814210) 山區(qū)橋梁與隧道工程國家重點(diǎn)實(shí)驗(yàn)室培育基地開放基金(CQSLBF-Y14-2)
【分類號(hào)】：U448.23
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本文編號(hào)：2458439