發(fā)布時間：2018-07-01 19:01

  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】：水利水電工程泄水建筑物中的閘墩是支撐并保證弧形閘門在所受水推力等荷載作用下安全運(yùn)行的關(guān)鍵結(jié)構(gòu)。隨著我國水利水電事業(yè)的發(fā)展,超大型水電站相繼開工建設(shè),泄水建筑物下泄流量不斷增加,相應(yīng)的工作水頭不斷加大,閘墩所受荷載同樣不斷增大。受樞紐布置、投資等因素的制約,閘墩尺寸不可能不受限制的增加,常規(guī)的鋼筋混凝土閘墩的剛度和承載能力已很難滿足閘墩可靠運(yùn)行的要求。因此,很有必要尋求一種新型閘墩結(jié)構(gòu),確�；⌒伍l門在大推力作用下能可靠運(yùn)行。本文根據(jù)型鋼混凝土的特點(diǎn),提出了在閘墩內(nèi)用型鋼代替常規(guī)筋混凝土閘墩的扇形鋼筋的新型型鋼混凝土閘墩結(jié)構(gòu),并開展了型鋼截面形式對型鋼混凝土閘墩承載能力的影響研究。本文結(jié)合擬建的實際工程,采用有限元法對普通鋼筋混凝土閘墩和型鋼混凝土閘墩建立非線性有限元模型,并對兩種結(jié)構(gòu)型式的閘墩模型施加相同的荷載和邊界位移條件。通過兩種閘墩的對比分析,從閘墩位移,牛腿支座附近拉應(yīng)力減小的趨勢,抑制裂縫開展的效果,和極限承載能力的大小共同論證了型鋼混凝土閘墩的合理性。本文研究了T型鋼,H型鋼,槽型鋼,箱型鋼在型鋼混凝土閘墩的適用性,研究了型鋼截面形式對型鋼混凝土閘墩承載能力的影響,得出了如下結(jié)論：(1)以兩側(cè)閘門擋水工況下的設(shè)計荷載為基礎(chǔ)荷載進(jìn)行超載計算,得出配置T型鋼閘墩的極限承載力最高,為4.5倍正常運(yùn)行設(shè)計荷載,H型鋼混凝土閘墩、箱型鋼混凝土閘墩和槽型鋼混凝土閘墩的的極限承載力均小于T型鋼閘墩,極限承載力較T型鋼混凝土閘墩分別減小了3.78%、7.33%和20.44%。從極限承載力來看,T型截面型鋼更適合于型鋼混凝土閘墩。(2)通過閘墩位移分析得出,不同截面形式的型鋼混凝土閘墩整體變形規(guī)律相近。牛腿支座及下游的墩體出現(xiàn)向下游的相對變位,且墩尾上側(cè)出現(xiàn)較大的沿閘墩高度方向的變位。在正常運(yùn)行工況下,T型鋼、H型鋼、箱型鋼、槽鋼混凝土閘墩最大位移分別為0.91mm、0.87mm、0.93mm、 0.87mm。(3)從閘墩的裂縫分布和發(fā)展來判斷,型鋼形式對混凝土開裂和裂縫的發(fā)展影響不明顯,當(dāng)荷載為正常荷載的0.58倍時,配置了T型鋼、H型鋼、箱型鋼和槽型鋼的閘墩均在牛腿支座受力面與墩體相交兩角點(diǎn)首先開裂。隨著荷載的增加,牛腿支座受力面與墩體相交處開裂并向牛腿支座后方發(fā)展。(4)T型鋼、H型鋼、槽型鋼、箱型鋼混凝土閘墩墩體內(nèi)型鋼在加載過程中沿型鋼布置方向(向下游)位移增加,其中在墩體與牛腿支座內(nèi)型鋼交接處變形最大。沿墩厚方向,墩體與牛腿支座內(nèi)型鋼交接處變位以及變形最大。(5)T型鋼、H型鋼、槽型鋼、箱型鋼混凝土閘墩內(nèi)型鋼首達(dá)屈服時的荷載分別為2.9、2.75、2.83、2.67倍正常運(yùn)行工況設(shè)計荷載,極限荷載分別為4.5、4.33、3.58、4.17倍正常運(yùn)行工況設(shè)計荷載,表明槽型鋼混凝土閘墩延性最差。
[Abstract]:The piers in the drainage structures of water conservancy and hydropower projects are the key structures to support and ensure the safe operation of the arc-shaped gates under the action of water thrust and other loads. With the development of water conservancy and hydropower industry in China, superlarge hydropower stations have started construction one after another, the discharge under the discharge structure is increasing, the corresponding working head is increasing, and the load on the pier is also increasing. Restricted by the layout of the hub and investment, the size of the pier can not be increased without restriction. The stiffness and bearing capacity of the conventional reinforced concrete pier are difficult to meet the requirements of reliable operation of the pier. Therefore, it is necessary to seek a new type of pier structure to ensure the reliable operation of arc gate under the action of large thrust. According to the characteristics of steel reinforced concrete, a new type of steel reinforced concrete pier structure is proposed in this paper, in which section steel is used to replace the sector steel bar of conventional reinforced concrete pier. The influence of section form on the bearing capacity of SRC pier is studied. In this paper, the nonlinear finite element model of the common reinforced concrete pier and the steel reinforced concrete pier is established by finite element method, and the same load and boundary displacement conditions are applied to the two types of pier models. Through the comparative analysis of the two kinds of piers, the rationality of the SRC pier is demonstrated from the displacement of the pier, the decreasing tendency of tensile stress near the bracket support, the effect of restraining the crack development, and the size of the ultimate bearing capacity. In this paper, the applicability of T-section H-shaped steel, grooved steel and box steel in steel reinforced concrete pier is studied, and the influence of section form on the bearing capacity of steel reinforced concrete pier is studied. The conclusions are as follows: (1) based on the design load under the condition of water retaining on both sides of the gate, the ultimate bearing capacity of the T-shaped steel pier is the highest, which is 4.5 times the normal operating load of the H-shaped steel concrete pier. The ultimate bearing capacity of box steel concrete pier and slot steel concrete pier is smaller than that of T section steel pier, and the ultimate bearing capacity is 3.787.33% and 20.44% less than that of T section steel concrete pier, respectively. According to the ultimate bearing capacity, the T-section steel is more suitable for the steel reinforced concrete pier. (2) through the displacement analysis of the pier, it is concluded that the integral deformation law of the steel reinforced concrete pier with different sections is similar. The corbel support and the lower pier body appear the relative displacement to the downstream, and the upper side of the pier tail appears the bigger displacement along the height direction of the pier. Under normal operating conditions, the maximum displacements of T section steel, box steel and channel concrete pier are 0.91mm / 0.87mm / 0.93mm and 0.87mm / m respectively. (3) judging from the crack distribution and development of the pier, the shape of section steel has no obvious influence on the crack and crack development of concrete. When the load is 0.58 times of the normal load, the T-section H-section steel is arranged, and the gate piers of the box steel and the slot section are first cracked at the two corners of the corbel bearing surface and the pier body. With the increase of load, the interface between the bearing surface of the corbel bearing and the pier is cracked and developed to the rear of the corbel support. (4) T-section steel and grooved steel, During the loading process, the internal steel displacement of box steel concrete pier increases along the direction of section steel arrangement (downstream), in which the deformation is greatest at the junction of section steel between the pier and the corbel support. Along the direction of the thickness of the pier, the displacement and deformation of the section steel in the interface between the pier and the corbel support is the greatest. (5) the load of the section head in the T section steel bar, the slot section steel and the box steel concrete sluice pier reaches yield when it reaches the yield time, respectively, when the load is 2.79 / 2.75 / 2.83 / 2.67 times the normal operating condition design load, The ultimate load is 4.35 ~ 4.33 ~ 3.58 ~ 4.17 times the design load under normal working condition, which indicates that the ductility of the slotted steel reinforced concrete pier is the worst.
【學(xué)位授予單位】：廣西大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：TV33;TV662.2

【參考文獻(xiàn)】

相關(guān)碩士學(xué)位論文 前1條

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本文編號：2088803