發(fā)布時間：2018-05-06 05:05

  本文選題：型鋼混凝土 + 閘墩　； 參考：《廣西大學(xué)》2017年碩士論文

【摘要】：閘墩是泄水建筑物的關(guān)鍵組成部分,閘墩結(jié)構(gòu)對整個水利樞紐的安全運行至關(guān)重要。隨著水利事業(yè)的快速發(fā)展,大流量、高水頭泄水建筑物越來越多,對閘墩承載力的要求也越來越高。由于地形地質(zhì)條件、樞紐布置等因素影響,閘墩厚度受到限制,不可能通過無限增加閘墩厚度來滿足對閘墩承載能力不斷增加的要求。預(yù)應(yīng)力閘墩的應(yīng)用,一定程度上解決了閘墩承載力不足問題,但預(yù)應(yīng)力錨索的應(yīng)力松弛、閘墩抗震性能的提高等問題還不能得到有效解決。型鋼混凝土具有承載能力強(qiáng)、剛度大、延展性能好等特點,將型鋼混凝土應(yīng)用于閘墩來提高其承載力已有一定數(shù)量的研究成果,但基本都是集中在閘墩每側(cè)只布置一根型鋼的研究,還尚欠缺墩體內(nèi)布置多根型鋼的研究。本文在型鋼混凝土閘墩已有的研究基礎(chǔ)上結(jié)合閘墩應(yīng)力分布等特點,在閘墩中布置多根分布式型鋼來研究型鋼布置形式對弧形閘門型鋼混凝土閘墩工作性能的影響。本文利用有限元軟件ANSYS,采用弧門支座附近閘墩的局部受拉區(qū)的配鋼量不變原則,分別建立單型鋼和多型鋼閘墩有限元模型。根據(jù)閘墩應(yīng)力分布等特點,將多型鋼閘墩內(nèi)型鋼數(shù)量設(shè)定為兩根和三根,并分別以20°、25°、30°、40°四種不同的擴(kuò)展角進(jìn)行布置。本文從閘墩位移、應(yīng)力、裂縫分布和承載能力等方面研究了型鋼布置形式對閘墩工作性能的影響。研究結(jié)果表明:(1)閘墩在對稱荷載作用下,保持型鋼之間擴(kuò)展角不變,閘墩最大位移隨型鋼數(shù)量增加而減小;保持型鋼數(shù)量不變,閘墩最大位移隨著擴(kuò)展角的增加先減小后增大。非對稱荷載作用下,擴(kuò)展角為20°、25°時,墩體內(nèi)布置兩根型鋼的閘墩最大位移較小;擴(kuò)展角為30°、40°時,墩體內(nèi)布置三根型鋼的閘墩最大位移較小。保持型鋼數(shù)量不變,閘墩最大位移隨著擴(kuò)展角的增加先減小后增大。(2)閘墩在對稱荷載作用下,保持型鋼之間擴(kuò)展角不變,多型鋼閘墩控制點應(yīng)力隨型鋼數(shù)量增加而減小;保持墩體內(nèi)型鋼數(shù)量不變,閘墩控制點應(yīng)力隨著擴(kuò)展角的增加先減小后增大。非對稱荷載作用下,墩體內(nèi)型鋼數(shù)量對閘墩控制點應(yīng)力影響不大;保持墩體內(nèi)型鋼數(shù)量不變,閘墩控制點應(yīng)力隨著擴(kuò)展角的增加逐漸增大。(3)多型鋼閘墩比單型鋼閘墩裂縫發(fā)展慢。對稱荷載作用下,多型鋼閘墩不同布置形式對閘墩裂縫發(fā)展影響不大。非對稱荷載作用下,型鋼之間擴(kuò)展角對多型鋼閘墩裂縫發(fā)展有較大影響,在裂縫初期,擴(kuò)展角較小的閘墩裂縫發(fā)展較慢;隨著裂縫的擴(kuò)散,擴(kuò)展角較大的閘墩裂縫發(fā)展較慢,裂縫超過型鋼布置范圍后在閘墩內(nèi)擴(kuò)散速度加快。布置型鋼數(shù)量對多型鋼閘墩裂縫發(fā)展影響不大。(4)閘墩在對稱荷載作用下,保持型鋼之間擴(kuò)展角不變,閘墩承載能力隨著型鋼數(shù)量的增加逐漸增強(qiáng);保持型鋼數(shù)量不變,閘墩承載能力隨著擴(kuò)展角的增加先增強(qiáng)后減弱。非對稱荷載作用下,保持型鋼之間擴(kuò)展角不變,墩體內(nèi)布置兩根型鋼的閘墩承載能力最強(qiáng);保持型鋼數(shù)量不變,閘墩承載能力隨擴(kuò)展角增加逐漸減弱。(5)從閘墩位移、應(yīng)力、裂縫發(fā)展情況和承載能力等方面綜合考慮,型鋼混凝土閘墩內(nèi)采用三根型鋼以25°擴(kuò)展角進(jìn)行布置時為相對較好的布置形式。
[Abstract]:The pier is the key part of the discharge building. The structure of the pier is very important to the safe operation of the whole water control project. With the rapid development of the water conservancy, the large flow and high water head discharge buildings are increasing, and the demand for the bearing capacity of the pier is increasing. The thickness of the pier is affected by the terrain quality conditions and the layout of the hub. To the limit, it is impossible to meet the requirement of increasing the bearing capacity of the pier by infinitely increasing the thickness of the pier. The application of the prestressed pier solves the problem of the insufficient bearing capacity of the pier to a certain extent, but the stress relaxation of the prestressed anchor cable and the improvement of the seismic performance of the pier can not be effectively solved. With the characteristics of strong bearing capacity, large stiffness and good ductility, the research results of the application of steel concrete to the pier to improve its bearing capacity have a certain number of research achievements, but the research on the layout of a type of steel at each side of the pier is mainly focused on. The research on the arrangement of multi type steel in the pier is still lacking. On the basis of the characteristics of the stress distribution of the pier, many distributed steels are arranged in the pier to influence the performance of the arc gate type steel concrete sluice pier. In this paper, the finite element software ANSYS is used to establish the single type steel in the local pulling area of the pier near the gate support. According to the characteristics of the stress distribution of the pier, the number of internal steel in the multi type steel sluice pier is set to two and three roots, and the different expansion angles are arranged at 20 degrees, 25 degrees, 30 degrees and 40 degrees respectively. This paper studies the type steel layout form to the pier workers from the displacement of the pier, the stress, the distribution of the cracks and the bearing capacity. The results show that: (1) under the action of symmetrical load, the expansion angle between the retaining type steel is constant, the maximum displacement of the pier decreases with the increase of the number of type steel, and the maximum displacement of the retaining type steel decreases first and then increases with the increase of the expansion angle. Under asymmetric load, the expansion angle is 20 degrees and 25 degrees, the pier body. The maximum displacement of the pier with two types of steel is smaller; the expansion angle is 30 degrees, and the maximum displacement of the pier in the pier is less. The maximum displacement of the retaining type steel is less. The maximum displacement of the retaining type steel decreases first and then increases with the increase of the expansion angle. (2) the pier has the constant expansion angle between the retaining steel, and the multi type steel sluice pier under the symmetrical load. The control point stress decreases with the increase of the number of type steel. The stress of the pier's control point decreases and then increases with the increase of the expansion angle. Under asymmetric load, the number of steel in the pier has little effect on the stress of the control point of the pier; the stress of the pier in the pier is constant, and the stress of the control point of the pier is with the expansion angle. The increase gradually increases. (3) the crack development of multi type steel sluice pier is slower than that of single type steel gate. Under symmetrical load, different layout forms have little influence on the crack development of the pier. Under asymmetric load, the expansion angle between steel type steel has a great influence on the crack development of multi type steel sluice pier, and in the early stage of the crack, the sluice pier crack is smaller. The development of seams is slower; with the diffusion of the cracks, the crack development of the pier with larger angle of expansion is slower, and the diffusion speed of the cracks in the pier is accelerated. The number of arranged steel has little effect on the crack development of the multi type steel sluice pier. (4) under the symmetrical load, the expansion angle between the retaining steel is constant, and the bearing capacity of the pier with the sluice pier will be along with the bearing capacity. The increase of the number of type steel increases gradually; the bearing capacity of the retaining type steel increases first and then decreases with the increase of the expansion angle. Under asymmetric load, the expansion angle between the retaining steel is the same, and the pier bearing capacity of the pier in the pier is the strongest; the bearing capacity of the retaining type steel is constant, and the bearing capacity of the pier increases with the expansion angle. Gradually weakening. (5) considering the displacement of the pier, the stress, the development of the crack and the bearing capacity, it is a relatively better arrangement of the three type steel in the sluice pier with 25 degree extension angle.

【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】：2017
【分類號】：TV65

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