本文選題：高粘瀝青 + 鋼橋�。� 參考：《山東建筑大學(xué)》2017年碩士論文

【摘要】：改革開放以來,我國經(jīng)濟社會發(fā)展取得了舉世矚目的成就,與經(jīng)濟社會發(fā)展密切相關(guān)的交通運輸業(yè)有了重大的發(fā)展,橋梁建設(shè)也實現(xiàn)了跨越式的發(fā)展。20世紀(jì)90年代至今,我國建設(shè)了許多大跨徑橋梁,其中大型鋼橋結(jié)構(gòu)具有結(jié)構(gòu)較輕、經(jīng)濟性較好的特點,從而使得大跨徑鋼橋得到了廣泛的應(yīng)用。相關(guān)數(shù)據(jù)表明,截止到2016年我國已建成的跨度大于300米的鋼橋已超過50座。與此同時,交通量和重型車數(shù)量的迅速增加以及日益加重的超載現(xiàn)象使橋面鋪裝層的破壞情況變得越發(fā)嚴(yán)重,某些大跨徑橋梁在通車后不久,橋面鋪裝就不同程度的出現(xiàn)了開裂、擁包、車轍、推移、脫層、脫空、坑槽等病害。特別是一些交通量較大的大跨徑橋梁的橋面鋪裝,其維護相對困難,而且一旦破壞,就必須進行維修,進而導(dǎo)致交通擁堵,從而會對我國經(jīng)濟社會發(fā)展造成巨大的損失。由此可見,橋面鋪裝成為制約大型鋼橋建設(shè)和發(fā)展的一個關(guān)鍵因素。為了解決該問題,各國專家學(xué)者做了大量的研究工作,他們認(rèn)為采用高粘瀝青作為鋪裝層材料可有效的改善鋪裝層和鋼板交界面的受力狀況,減少鋪裝層剪切破壞。同時,由車輛荷載和溫度差所引起的鋪裝層開裂等病害也能得到有效的降低和改善。但是高粘瀝青混合料是一種新型橋面鋪裝材料,其在我國起步時間較晚,力學(xué)特性尚不明確,高粘瀝青鋪裝層的設(shè)計急需完善的理論研究做指導(dǎo)。鑒于此,本文開展了高粘瀝青作為大跨徑鋼橋橋面鋪裝材料的力學(xué)特性研究。本文利用有限元軟件ANSYS對高粘瀝青不同厚度的鋪裝層進行靜力學(xué)、動力學(xué)分析。在靜力學(xué)分析中采用了不同的加載位置,以靜態(tài)模量作為所需的彈性模量,在動力學(xué)分析中采用動態(tài)模量作為所需的彈性模量,以此來明確最佳鋪裝層厚度和形式,并且選取SBS瀝青、環(huán)氧瀝青來作為對比,分析其力學(xué)特性的差異,從而分析得出三種材料的優(yōu)劣性;在選定鋪裝層厚度和形式的前提下,分別選取60℃(高溫)、20℃(中溫)、-10℃(低溫)三個溫度條件,以此來分析高粘瀝青混合料作為鋪裝層材料隨溫度變化而發(fā)生的力學(xué)特性變化,從而明確溫度的效應(yīng);最后,本文對橋頭有無剪力鍵時的力學(xué)響應(yīng)進行了分析,以明確橋頭剪力鍵的作用。本文通過研究獲得以下結(jié)論;(1)大跨徑鋼橋高粘瀝青鋪裝層的最佳鋪裝形式與厚度為單層5cm,荷載最不利位置為荷載2;(2)同為大跨徑鋼橋鋪裝層材料,高粘瀝青混合料要優(yōu)于SBS瀝青混合料,與環(huán)氧瀝青混合料相比則各有優(yōu)劣,高粘瀝青混合料受抗特性好于環(huán)氧瀝青混合料,抗剪性不如環(huán)氧瀝青混合料;(3)鋪裝層溫度從60℃(高溫)變化到20℃(中溫),再到-10℃(低溫),高粘瀝青鋪裝層力學(xué)特性隨之發(fā)生了較大的變化;(4)橋頭設(shè)置剪力鍵對橋頭位置高粘瀝青鋪裝層底層的水平剪應(yīng)力(剪力鍵后方)具有有效的降低作用。
[Abstract]:Since the reform and opening up, China's economic and social development has made remarkable achievements, and the transportation industry, which is closely related to the economic and social development, has made great progress. The bridge construction has also achieved a leapfrog development from the 1990s to the present. Many long-span bridges have been built in China, among which the large steel bridges have the characteristics of lighter structure and better economy, which makes the long-span steel bridges widely used. By 2016, more than 50 steel bridges with a span of more than 300 meters had been built in China. At the same time, the rapid increase in traffic volume and the number of heavy vehicles, as well as the increasing phenomenon of overloading, have made the destruction of deck paving more serious, and some long-span bridges have not long been opened to traffic. Bridge deck pavement on varying degrees of cracking, pack, rut, bed, delamination, void, potholes and other diseases. In particular, the pavement of some long-span bridges with large traffic volume is relatively difficult to maintain, and once damaged, it must be repaired, which will lead to traffic congestion, which will cause huge losses to the economic and social development of our country. Thus, deck pavement becomes a key factor restricting the construction and development of large steel bridges. In order to solve this problem, experts and scholars all over the world have done a lot of research work. They think that using high viscosity asphalt as pavement material can effectively improve the stress condition of the interface between pavement and steel plate, and reduce the shear failure of pavement. At the same time, pavement cracking caused by vehicle load and temperature difference can also be effectively reduced and improved. However, high viscosity asphalt mixture is a new bridge deck pavement material, which started late in our country, and its mechanical properties are not clear yet. The design of high viscosity asphalt pavement needs to be guided by perfect theoretical research. In view of this, the mechanical properties of high-viscosity asphalt as bridge deck pavement material of long span steel bridge are studied in this paper. In this paper, the finite element software ANSYS is used to analyze the statics and dynamics of high viscosity asphalt pavement with different thickness. In the static analysis, different loading positions are adopted, the static modulus is taken as the required elastic modulus, and the dynamic modulus is used as the required elastic modulus in the dynamic analysis, so as to determine the best thickness and form of the pavement. And choose SBS asphalt and epoxy asphalt as contrast, analyze the difference of their mechanical properties, and then analyze the advantages and disadvantages of three kinds of materials; under the premise of selecting the thickness and form of pavement, Three temperature conditions, 60 鈩，

本文編號：2112688