【摘要】：水利水電工程泄水建筑物中的弧形閘門(mén)閘墩是支撐弧形閘門(mén)并保證弧形閘門(mén)在水推力作用下安全運(yùn)行的關(guān)鍵結(jié)構(gòu)。隨著水利水電事業(yè)的不斷發(fā)展,大跨度、高水頭的弧形閘門(mén)閘墩的應(yīng)用不斷增加,弧形閘門(mén)閘墩所承受的荷載也相應(yīng)的加大。由于受到樞紐布置、投資等因素的制約,常規(guī)鋼筋混凝土閘墩難以滿足大推力作用下閘墩可靠運(yùn)行而不加大閘墩尺寸及改變樞紐布置的要求。而預(yù)應(yīng)力技術(shù)在閘墩上的應(yīng)用,雖然部分解決了大推力弧門(mén)閘墩承載能力和控制混凝土開(kāi)裂的問(wèn)題,但預(yù)應(yīng)力閘墩存在預(yù)應(yīng)力錨索拉錨系數(shù)高、施工難度和施工耗材大等問(wèn)題不易解決。初步的研究表明,利用型鋼混凝土強(qiáng)度高、剛度大、延展性能好的優(yōu)點(diǎn),把弧形閘門(mén)閘墩設(shè)計(jì)成型鋼混凝土結(jié)構(gòu)是合理的,是解決大推力弧形閘門(mén)閘墩受力變形問(wèn)題的有效途徑之一,但目前國(guó)內(nèi)外關(guān)于這方面的研究并不多,有很多問(wèn)題有待進(jìn)一步的深入研究。本文根據(jù)型鋼混凝土的特點(diǎn),在已有研究成果的基礎(chǔ)之上,結(jié)合擬建工程實(shí)際情況開(kāi)展型鋼混凝土閘墩兩側(cè)型鋼之間設(shè)置橫向連接型鋼對(duì)型鋼混凝土閘墩工作性能的影響研究。本文結(jié)合擬建閘墩的實(shí)際情況,在已有的研究成果基礎(chǔ)上,利用有限元軟件ANSYS建立有限元模型,從閘墩的位移、應(yīng)力、裂縫的分布及承載能力等方面,論證型鋼混凝土閘墩內(nèi)兩側(cè)型鋼之間設(shè)置橫向連接型鋼的合理性,在此基礎(chǔ)上對(duì)橫向連接型鋼的布置形式、截面形式對(duì)型鋼混凝土閘墩工作性能的影響開(kāi)展研究。通過(guò)分析研究得出以下主要結(jié)論：(1)在閘墩承受非對(duì)稱荷載作用下,設(shè)置橫向連接可以改善閘墩工作性能；在對(duì)稱荷載作用下,型鋼混凝土閘墩兩側(cè)型鋼之間是否設(shè)置橫向連接型鋼對(duì)閘墩工作性能影響不明顯。在非對(duì)稱荷載作用下,以橫向連接型鋼總截面面積不變?yōu)樵瓌t,橫向連接型鋼的不同布置形式對(duì)閘墩的最大位移和應(yīng)力都有影響。在牛腿型鋼與墩體內(nèi)型鋼交接處及牛腿頸部處分別布置一根連接型鋼的布置方案對(duì)提高閘墩的承載能力最有利。(2)設(shè)置橫向連接型鋼有利于提高閘墩初始裂縫荷載,在牛腿型鋼與墩體內(nèi)型鋼交接處及牛腿頸部處分別布置一根連接型鋼的布置方案對(duì)于提高閘墩初始裂縫荷載最有利。(3)橫向連接型鋼采用工字型、T型、槽型截面時(shí),在相同荷載作用下,相對(duì)而言,工字型截面型鋼閘墩的最大拉應(yīng)力、最大位移均最小,更適合用作橫向連接型鋼。
[Abstract]:The arch gate pier in the drainage structure of water conservancy and hydropower project is the key structure to support the arc gate and ensure the safe operation of the arc gate under the action of water thrust. With the continuous development of water conservancy and hydropower industry, the application of arc gate pier with large span and high water head is increasing, and the load of arc gate pier is also increased accordingly. Due to the constraints of hub layout and investment, it is difficult for conventional reinforced concrete piers to meet the requirements of reliable operation of the pier under the action of large thrust without increasing the size of the pier and changing the layout of the hub. The application of prestressed technology in the pier, although it partly solves the problems of bearing capacity and controlling concrete cracking of the high-thrust arc-gate pier, but the prestressed pier has high coefficient of pulling and anchoring with prestressed anchor cable. Construction difficulty and construction consumables are difficult to solve. The preliminary study shows that it is reasonable to design the arch gate pier into a steel reinforced concrete structure by taking advantage of the advantages of high strength, high stiffness and good extension performance of steel reinforced concrete (SRC). It is one of the effective ways to solve the problem of stress and deformation of large thrust arc gate pier. However, there are few researches on this aspect at home and abroad, and many problems need to be further studied. According to the characteristics of steel reinforced concrete (SRC) and on the basis of the existing research results, combined with the actual situation of the proposed project, this paper studies the influence of the transverse connection between the sections of steel reinforced concrete (SRC) piers on the working performance of SRC piers. Combined with the actual situation of the proposed pier, based on the existing research results, the finite element model is established by using the finite element software ANSYS, from the displacement, stress, crack distribution and bearing capacity of the pier, etc. This paper demonstrates the rationality of setting transverse connections between sections of steel reinforced concrete piers. On the basis of this, the layout of transverse connections and the influence of cross section on the working performance of steel reinforced concrete piers are studied. The main conclusions are as follows: (1) under the action of asymmetric load on the pier, the working performance of the pier can be improved by setting the transverse connection; Under symmetrical load, whether or not the transverse connections between the sections on both sides of the SRC pier have no obvious influence on the working performance of the pier. Under the action of asymmetric load, the total cross-section area of the transverse connection steel is not changed into the principle, and the different arrangement forms of the transverse connection section steel have influence on the maximum displacement and stress of the pier. The arrangement of a connecting section at the junction of the corbel steel and the inner section of the pier and the corbel neck is the most favorable to improve the bearing capacity of the pier. (2) setting the transverse connection steel is beneficial to increase the initial crack load of the pier. The arrangement of a connecting section at the junction between the corbel steel and the inner section of the pier and at the corbel neck is the most advantageous to increase the initial crack load of the pier. (3) when the transverse connection section is I-shaped, T-shaped and grooved, Under the same load, the maximum tensile stress and the maximum displacement of I-shaped section steel pier are minimum, so it is more suitable to be used as transverse connecting steel.
【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】：2016
【分類號(hào)】：TV66;TV33

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