本文選題：橋梁工程 + 設(shè)計方案　； 參考：《長安大學(xué)學(xué)報(自然科學(xué)版)》2017年02期

【摘要】：裝配式公路鋼橋在戰(zhàn)時搶修、抗震救災(zāi)中橋梁修復(fù)與加固等應(yīng)急工程中發(fā)揮了重要作用,但現(xiàn)有裝配式公路鋼橋最大理論跨越能力只有69m,導(dǎo)致部分交通要道的大跨度橋梁短時期無法修復(fù),造成了巨大的經(jīng)濟(jì)效益和社會效益損失。為滿足大跨度橋梁應(yīng)急搶修的要求,以單跨90m裝配式公路鋼橋為研究對象,提出采用抗彎和抗扭性能較好的矩形鋼管截面作為桁架構(gòu)件的主要截面以提高結(jié)構(gòu)的跨越能力,在繼承原有研究成果的基礎(chǔ)上設(shè)計了"321"型、"200"型矩形鋼管桁架方案,創(chuàng)新性地設(shè)計了"600"型矩形鋼管桁架方案和三角形桁架方案。在有限元建模分析的基礎(chǔ)上,詳細(xì)分析了4種設(shè)計結(jié)構(gòu)方案在移動荷載作用下的最大位移、組合應(yīng)力、用鋼量及1階穩(wěn)定屈曲系數(shù)這4個關(guān)鍵指標(biāo)各自的優(yōu)劣。為了方便橋梁設(shè)計方案的比選,以橋梁設(shè)計的基本目標(biāo)作為評價設(shè)計方案的影響因素,利用模糊數(shù)學(xué)和層次分析法分解評判指標(biāo)體系,建立了運用二級模糊綜合評價決策方法進(jìn)行設(shè)計方案優(yōu)選比較的指標(biāo)體系和方法。最后,結(jié)合單跨90m裝配式公路鋼橋的4種設(shè)計方案,給出了模糊層次分析評價和設(shè)計方案優(yōu)選的具體過程。研究結(jié)果表明:"600"型矩形鋼管桁架方案所對應(yīng)的判斷結(jié)果矩陣中的元素值最大,說明該設(shè)計方案在力學(xué)性能、經(jīng)濟(jì)合理性、技術(shù)可行性、施工方便性等方面優(yōu)勢明顯,為4個設(shè)計方案中的最優(yōu)方案。研究成果可為后續(xù)大跨裝配式公路鋼橋的研制方案提供設(shè)計思路和技術(shù)參考。
[Abstract]:Prefabricated highway steel bridges have played an important role in emergency projects such as emergency repair and reinforcement of bridges in times of war and earthquake relief. However, the maximum theoretical span capacity of existing prefabricated steel bridges is only 69m, which leads to the failure to repair the long-span bridges of some major roads in a short period of time, resulting in huge loss of economic and social benefits. In order to meet the requirements of emergency repair of long-span bridges, taking the single-span 90m assembled highway steel bridge as the research object, the rectangular steel pipe section with good flexural and torsional resistance is proposed as the main section of the truss members to improve the span ability of the structure. The "321" and "200" rectangular steel pipe truss schemes are designed on the basis of inheriting the original research results, and the "600" rectangular steel pipe truss schemes and triangular truss schemes are designed innovatively. On the basis of finite element modeling and analysis, the four key indexes of the four design schemes under moving load, such as maximum displacement, combined stress, steel quantity and first-order stable buckling coefficient, are analyzed in detail. In order to facilitate the comparison and selection of bridge design scheme, the basic objective of bridge design is taken as the influence factor of evaluating the design scheme, and the index system of decomposition and evaluation by fuzzy mathematics and analytic hierarchy process (AHP) is used. The index system and method of optimal selection and comparison of design schemes by using two level fuzzy comprehensive evaluation decision method are established. Finally, combined with four design schemes of single-span 90m assembled highway steel bridge, the concrete process of fuzzy AHP evaluation and design scheme optimization is given. The results show that the element value in the judgement matrix of the "600" rectangular steel pipe truss scheme is the largest, which indicates that the design scheme has obvious advantages in mechanical performance, economic rationality, technical feasibility, construction convenience and so on. The optimal scheme for the four design schemes. The research results can provide the design idea and technical reference for the development scheme of the long span assembled highway steel bridge.
【作者單位】： 長安大學(xué)公路學(xué)院;
【基金】：國家自然科學(xué)基金項目(51378068,51308056) 中央高�；究蒲袠I(yè)務(wù)費專項資金項目(2014G1211002,2014G2210003) 交通運輸部企業(yè)技術(shù)創(chuàng)新項目(2013315490060)
【分類號】：U448.36

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