本文選題：型鋼混凝土 + 閘墩　； 參考：《廣西大學(xué)》2014年碩士論文

【摘要】：閘墩是水利水電工程泄水建筑物的重要組成部分,閘墩結(jié)構(gòu)的安全直接影響著整個(gè)水利樞紐的安全。隨著我國水利水電事業(yè)的發(fā)展,越來越多的大型水利水電工程開工建設(shè),泄水建筑物的泄流量、工作水頭也越來越大,閘墩受到閘門推力的作用也越來越大,單純采用普通鋼筋混凝土結(jié)構(gòu)已經(jīng)很難滿足大推力閘墩結(jié)構(gòu)的安全要求。預(yù)應(yīng)力閘墩在泄水建筑物閘墩中的應(yīng)用,在一定程度上解決了這個(gè)問題,但預(yù)應(yīng)力閘墩存在預(yù)應(yīng)力錨索在提高閘墩剛度方面作用不大、施工工藝比較復(fù)雜以及工期長等不足,仍然不能徹底解決大推力閘墩的安全問題。本論文根據(jù)型鋼混凝土結(jié)構(gòu)具有承載能力高、剛度大、延展性好的特點(diǎn),結(jié)合工程實(shí)際提出了一種利用型鋼混凝土技術(shù)在墩體和牛腿支座處配置一定H型鋼的新型閘墩結(jié)構(gòu),也就是H型鋼混凝土閘墩,并重點(diǎn)開展了保護(hù)層厚度對(duì)H型鋼混凝土閘墩承載能力的影響研究。本論文利用大型通用有限元軟件ANSYS來進(jìn)行閘墩的承載能力分析,從閘墩的位移、應(yīng)力、裂縫的分布以及承載能力等方面,論證型鋼混凝土閘墩的合理性,在此基礎(chǔ)上重點(diǎn)分析了保護(hù)層厚度對(duì)H型鋼混凝土閘墩承載能力的影響,根據(jù)閘墩結(jié)構(gòu)和型鋼混凝土的特點(diǎn),保護(hù)層厚度范圍采用300mm-600mm,分別研究了300mm、400mm、500mm以及600mm四種不同保護(hù)層厚度閘墩的承載能力,通過研究分析得出如下結(jié)論：(1)在相同配鋼量的情況下,閘墩在達(dá)到其極限承載能力之前,型鋼混凝土閘墩各個(gè)部位的位移、應(yīng)力、裂縫的分布和常規(guī)鋼筋混凝土閘墩相近；閘墩達(dá)到極限承載能力狀態(tài)時(shí),型鋼混凝土閘墩荷載比常規(guī)鋼筋混凝土閘墩荷載稍大。說明型鋼能代替常規(guī)鋼筋混凝土閘墩墩體扇形分布的受力鋼筋和牛腿支座中的縱向受力鋼筋,并且型鋼在閘墩內(nèi)所占的空間小,有利于型鋼混凝土閘墩在大推力閘墩中的應(yīng)用。(2)閘墩在達(dá)到其極限承載能力之前,保護(hù)層厚度對(duì)閘墩的混凝土以及型鋼各個(gè)部位的位移分布沒有明顯影響；閘墩達(dá)到其極限承載能力狀態(tài)時(shí),不同保護(hù)層厚度的閘墩其極限位移有所不同,隨混凝土保護(hù)層厚度的增加閘墩的極限位移先增加后減小,保護(hù)層厚度為400mm的閘墩,混凝土以及型鋼的極限位移位移最大。(3)H型鋼在其進(jìn)入屈服狀態(tài)前,保護(hù)層厚度對(duì)H型鋼的各個(gè)部位的應(yīng)力分布無明顯影響,但是對(duì)型鋼屈服后的應(yīng)力有一定的影響,閘墩達(dá)到其極限承載能力狀態(tài)時(shí),保護(hù)層厚度為400mm的型鋼屈服長度最長,應(yīng)力也最大；混凝土的應(yīng)力在荷載作用的不同階段下分布以及大小相近。(4)保護(hù)層厚度對(duì)H型鋼混凝土閘墩各個(gè)部位的裂縫分布以及發(fā)展無明顯影響,在荷載作用的整個(gè)過程中,閘墩的裂縫分布范圍以及裂縫的發(fā)展速度相近,閘墩的裂縫主要由混凝土材料的性能決定。(5)保護(hù)層厚度對(duì)H型鋼混凝土閘墩結(jié)構(gòu)的極限承載能力有著較大的影響,混凝土保護(hù)層厚度從300mm增加到600mm時(shí),承載能力先增加后減小,保護(hù)層厚度為400mm的閘墩承載能力最高。
[Abstract]:The pier is an important part of the discharge structure of water conservancy and hydropower project. The safety of the pier structure directly affects the safety of the whole water conservancy project. With the development of water conservancy and hydropower development in China, more and more large water conservancy and hydropower projects have been built, the discharge of the discharge buildings and the head of the working water are becoming larger and larger, and the gate piers are pushed by the gate. The effect of force is becoming more and more big, it is difficult to meet the safety requirements of the structure of large thrust pier simply using ordinary reinforced concrete structure. The application of the prestressed pier in the sluice pier of the discharge building has solved this problem to a certain extent, but the prestressed anchorage cable has little effect on improving the rigidity of the pier. The safety of large thrust piers can not be solved thoroughly. This paper has the characteristics of high bearing capacity, large stiffness and good ductility in this paper. A steel concrete technique of use type steel concrete technique is put forward to configure a certain type of H steel at pier body and leg support according to the engineering practice. The new type of pier structure is the H type steel concrete sluice pier, and the influence of the thickness of the protective layer on the bearing capacity of the H type steel concrete sluice pier is emphatically studied. This paper uses the large general finite element software ANSYS to analyze the bearing capacity of the pier, from the displacement of the pier, the stress, the distribution of the crack and the bearing capacity, and so on. On the basis of this, the influence of the thickness of the protective layer on the bearing capacity of the H steel concrete sluice pier is emphatically analyzed. According to the characteristics of the pier structure and the type steel concrete, the thickness range of the protective layer is 300mm-600mm, and the bearing capacity of the four different protective layers of the protective layer of 600mm and the 300mm, 400mm, 500mm and the thickness of the thickness of the protective layer are studied respectively. Through the research and analysis, the following conclusions are drawn: (1) in the case of the same amount of steel, the displacement, stress and distribution of the cracks are close to the conventional reinforced concrete pier before the pier reaches its ultimate bearing capacity. When the pier reaches the limit bearing capacity state, the load ratio of the type steel concrete sluice pier is conventional. The load of the reinforced concrete sluice pier is slightly larger. The explanatory steel can replace the conventional Reinforced Concrete Sluice Piers and the longitudinal force steel in the supporting bar and the leg support, and the space of the type steel in the pier is small, which is beneficial to the application of the steel concrete sluice pier in the large thrust pier. (2) the pier has reached its ultimate bearing capacity. Before, the thickness of the protective layer has no obvious influence on the displacement distribution of the concrete of the pier and the different parts of the steel. When the pier reaches its ultimate bearing capacity, the ultimate displacement of the pier with different thickness of the protective layer is different. With the thickness of the concrete protective layer, the limit displacement of the pier increases first and then decreases, the thickness of the protective layer is 4. The maximum displacement displacement of the pier, concrete and type steel in 00mm is the largest. (3) the thickness of the protective layer has no obvious influence on the stress distribution in each part of the H steel before it enters the yield state, but it has a certain influence on the stress after the yield of the steel type steel. When the pier reaches its limit bearing capacity state, the thickness of the protective layer is 400mm of the type steel. The length of the yield is the longest and the stress is the greatest. The stress of concrete is distributed and the size is close to the different stages of the load. (4) the thickness of the protective layer has no obvious influence on the distribution and development of the cracks in each part of the H type steel concrete sluice pier. In the whole process of the load action, the distribution of the cracks in the pier and the speed of the crack development The cracks of the pier are mainly determined by the performance of the concrete material. (5) the thickness of the protective layer has a great influence on the ultimate bearing capacity of the H type steel concrete sluice pier structure. When the thickness of the concrete protective layer is increased from 300mm to 600mm, the bearing capacity increases first and then decreases, and the bearing capacity of the pier with the thickness of the protective layer is the highest for the pier of 400mm.
【學(xué)位授予單位】：廣西大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：TV662.2

【參考文獻(xiàn)】

相關(guān)碩士學(xué)位論文 前1條

1 楊佳林;型鋼混凝土柱的工程應(yīng)用及配置不同截面型鋼的分析研究[D];太原理工大學(xué);2007年

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本文編號(hào)：2029356