横向连接型钢对型钢混凝土闸墩工作性能的影响研究

发布时间：2018-12-22 08:34

【摘要】：水利水电工程泄水建筑物中的弧形闸门闸墩是支撑弧形闸门并保证弧形闸门在水推力作用下安全运行的关键结构。随着水利水电事业的不断发展,大跨度、高水头的弧形闸门闸墩的应用不断增加,弧形闸门闸墩所承受的荷载也相应的加大。由于受到枢纽布置、投资等因素的制约,常规钢筋混凝土闸墩难以满足大推力作用下闸墩可靠运行而不加大闸墩尺寸及改变枢纽布置的要求。而预应力技术在闸墩上的应用,虽然部分解决了大推力弧门闸墩承载能力和控制混凝土开裂的问题,但预应力闸墩存在预应力锚索拉锚系数高、施工难度和施工耗材大等问题不易解决。初步的研究表明,利用型钢混凝土强度高、刚度大、延展性能好的优点,把弧形闸门闸墩设计成型钢混凝土结构是合理的,是解决大推力弧形闸门闸墩受力变形问题的有效途径之一,但目前国内外关于这方面的研究并不多,有很多问题有待进一步的深入研究。本文根据型钢混凝土的特点,在已有研究成果的基础之上,结合拟建工程实际情况开展型钢混凝土闸墩两侧型钢之间设置横向连接型钢对型钢混凝土闸墩工作性能的影响研究。本文结合拟建闸墩的实际情况,在已有的研究成果基础上,利用有限元软件ANSYS建立有限元模型,从闸墩的位移、应力、裂缝的分布及承载能力等方面,论证型钢混凝土闸墩内两侧型钢之间设置横向连接型钢的合理性,在此基础上对横向连接型钢的布置形式、截面形式对型钢混凝土闸墩工作性能的影响开展研究。通过分析研究得出以下主要结论：(1)在闸墩承受非对称荷载作用下,设置横向连接可以改善闸墩工作性能；在对称荷载作用下,型钢混凝土闸墩两侧型钢之间是否设置横向连接型钢对闸墩工作性能影响不明显。在非对称荷载作用下,以横向连接型钢总截面面积不变为原则,横向连接型钢的不同布置形式对闸墩的最大位移和应力都有影响。在牛腿型钢与墩体内型钢交接处及牛腿颈部处分别布置一根连接型钢的布置方案对提高闸墩的承载能力最有利。(2)设置横向连接型钢有利于提高闸墩初始裂缝荷载,在牛腿型钢与墩体内型钢交接处及牛腿颈部处分别布置一根连接型钢的布置方案对于提高闸墩初始裂缝荷载最有利。(3)横向连接型钢采用工字型、T型、槽型截面时,在相同荷载作用下,相对而言,工字型截面型钢闸墩的最大拉应力、最大位移均最小,更适合用作横向连接型钢。
[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.
【学位授予单位】：广西大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：TV66;TV33

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