覆土式UHPC波折板拱橋力學(xué)性能分析
發(fā)布時間：2018-10-04 20:28
【摘要】：目前的中小跨徑拱橋主要是鋼筋混凝土拱橋或者圬工拱橋,在公路運(yùn)輸網(wǎng)中使用廣泛,隨著時間的推移這類結(jié)構(gòu)都發(fā)生了不同程度的病害,傳統(tǒng)實腹式拱橋的不足之處也逐漸的顯現(xiàn)出來:施工繁瑣、工期長,而且在使用的過程中會經(jīng)常出現(xiàn)混凝土開裂、基礎(chǔ)沉降等病害,尤其在地質(zhì)不良和溫度變化較大的地區(qū)更為明顯,影響結(jié)構(gòu)的正常使用和交通運(yùn)輸安全。因此尋找一種施工簡單、承載力強(qiáng)、高耐久性的結(jié)構(gòu)成為工程技術(shù)人員的重要任務(wù)。本文提出的覆土式UHPC波折板拱橋是將UHPC(Ultra-High-Performance Concrete超高性能混凝土)應(yīng)用于實腹式拱橋中,該結(jié)構(gòu)有著以下幾方面的優(yōu)勢:(1)結(jié)構(gòu)強(qiáng)度大,自重輕;(2)采用預(yù)制裝配式施工,施工速度快;(3)對基礎(chǔ)沉降和溫度變化適應(yīng)能力強(qiáng)。本文主要研究內(nèi)容及成果如下:(1)對覆土式UHPC波折板拱橋進(jìn)行設(shè)計,確定跨徑、矢跨比、板厚度、填土高度等具體尺寸,并充分利用UHPC的優(yōu)越性能,減小截面尺寸降低拱圈自重;(2)采用ANSYS對結(jié)構(gòu)進(jìn)行數(shù)值計算,分析結(jié)構(gòu)在施工階段和成橋階段的結(jié)構(gòu)受力變形情況,并對非對稱填土進(jìn)行模擬計算。結(jié)果表明:覆土式UHPC波折板拱橋可以滿足施工和成橋階段的受力要求,在施工過程中應(yīng)該加強(qiáng)對結(jié)構(gòu)的監(jiān)控,避免非對稱填土的不利影響;(3)對覆土式UHPC波折板拱橋進(jìn)行基礎(chǔ)變位、整體溫度變化和彈性穩(wěn)定性等力學(xué)性能分析,并探討波折截面對于結(jié)構(gòu)穩(wěn)定性的影響。同時針對該拱橋結(jié)構(gòu)的土-拱聯(lián)合作用進(jìn)行對比分析。結(jié)果表明:相比較傳統(tǒng)實腹式拱橋,本結(jié)構(gòu)對基礎(chǔ)沉降和溫度變化的適應(yīng)能力都有較明顯的提高,采用波折截面可以有效的提高結(jié)構(gòu)的穩(wěn)定性,在考慮土-拱作用的對比中可知由于土體圍壓和分散荷載的作用,結(jié)構(gòu)的受力較均勻,變形也有所降低;(4)對結(jié)構(gòu)進(jìn)行參數(shù)分析,并進(jìn)一步提出空腹式UHPC拱橋的構(gòu)想,通過設(shè)置鋼波紋管以減輕土體自重、提高結(jié)構(gòu)的跨越能力,并對其可行性進(jìn)行探討。
[Abstract]:At present, the middle and small span arch bridges are mainly reinforced concrete arch bridges or masonry arch bridges, which are widely used in the highway transport network. The shortcomings of the traditional full-web arch bridge are also gradually revealed: the construction is cumbersome, the construction period is long, and in the process of use, there will often be concrete cracking, foundation settlement and other diseases. Especially in areas with poor geology and large temperature change, it affects the normal use of structure and transportation safety. Therefore, it is an important task for engineers to find a structure with simple construction, strong bearing capacity and high durability. In this paper, the earth-covered UHPC corrugated plate arch bridge is applied to the full-web arch bridge with UHPC (Ultra-High-Performance Concrete ultra-high performance concrete). The structure has the following advantages: (1) the structure has large strength and light weight, (2) prefabricated construction, (3) strong adaptability to foundation settlement and temperature change. The main contents and achievements of this paper are as follows: (1) the design of UHPC corrugated arch bridge with overlying soil is carried out to determine the specific dimensions, such as span, rise-to-span ratio, thickness of plate, height of fill, etc., and make full use of the superior performance of UHPC. (2) using ANSYS to calculate the structure, analyze the deformation of the structure in the construction stage and the bridge stage, and simulate the asymmetric fill. The results show that the soil-covered UHPC corrugated arch bridge can meet the stress requirements of the construction and the completion stage, and the monitoring of the structure should be strengthened during the construction process. To avoid the adverse effects of asymmetric fill; (3) to analyze the foundation displacement, temperature change and elastic stability of UHPC corrugated arch bridge with overlying soil, and to discuss the influence of the corrugated cross section on the stability of the structure. At the same time, the soil-arch combined action of the arch bridge structure is compared and analyzed. The results show that compared with the traditional full-web arch bridge, the adaptability of the structure to the foundation settlement and temperature change is obviously improved, and the stability of the structure can be effectively improved by using the zigzag section. Considering the soil-arch effect, it can be seen that due to the effect of soil confining pressure and scattered load, the stress of the structure is uniform and the deformation is reduced. (4) the parameter analysis of the structure is carried out, and the conception of the hollow UHPC arch bridge is put forward. Steel bellows are set up to reduce the weight of soil and to improve the crossing ability of the structure, and the feasibility of the corrugated pipe is discussed.
【學(xué)位授予單位】：湖南大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：U441;U448.22
本文編號：2251770
[Abstract]:At present, the middle and small span arch bridges are mainly reinforced concrete arch bridges or masonry arch bridges, which are widely used in the highway transport network. The shortcomings of the traditional full-web arch bridge are also gradually revealed: the construction is cumbersome, the construction period is long, and in the process of use, there will often be concrete cracking, foundation settlement and other diseases. Especially in areas with poor geology and large temperature change, it affects the normal use of structure and transportation safety. Therefore, it is an important task for engineers to find a structure with simple construction, strong bearing capacity and high durability. In this paper, the earth-covered UHPC corrugated plate arch bridge is applied to the full-web arch bridge with UHPC (Ultra-High-Performance Concrete ultra-high performance concrete). The structure has the following advantages: (1) the structure has large strength and light weight, (2) prefabricated construction, (3) strong adaptability to foundation settlement and temperature change. The main contents and achievements of this paper are as follows: (1) the design of UHPC corrugated arch bridge with overlying soil is carried out to determine the specific dimensions, such as span, rise-to-span ratio, thickness of plate, height of fill, etc., and make full use of the superior performance of UHPC. (2) using ANSYS to calculate the structure, analyze the deformation of the structure in the construction stage and the bridge stage, and simulate the asymmetric fill. The results show that the soil-covered UHPC corrugated arch bridge can meet the stress requirements of the construction and the completion stage, and the monitoring of the structure should be strengthened during the construction process. To avoid the adverse effects of asymmetric fill; (3) to analyze the foundation displacement, temperature change and elastic stability of UHPC corrugated arch bridge with overlying soil, and to discuss the influence of the corrugated cross section on the stability of the structure. At the same time, the soil-arch combined action of the arch bridge structure is compared and analyzed. The results show that compared with the traditional full-web arch bridge, the adaptability of the structure to the foundation settlement and temperature change is obviously improved, and the stability of the structure can be effectively improved by using the zigzag section. Considering the soil-arch effect, it can be seen that due to the effect of soil confining pressure and scattered load, the stress of the structure is uniform and the deformation is reduced. (4) the parameter analysis of the structure is carried out, and the conception of the hollow UHPC arch bridge is put forward. Steel bellows are set up to reduce the weight of soil and to improve the crossing ability of the structure, and the feasibility of the corrugated pipe is discussed.
【學(xué)位授予單位】：湖南大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：U441;U448.22
【引證文獻(xiàn)】
相關(guān)碩士學(xué)位論文 前1條
1 朱增奇;9×66m上承式鋼筋混凝土板拱橋施工技術(shù)研究[D];石家莊鐵道大學(xué);2017年
，本文編號：2251770
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