型钢布置形式对弧形闸门型钢混凝土闸墩工作性能的影响研究

发布时间：2018-05-06 05:05

本文选题：型钢混凝土 + 闸墩　；参考：《广西大学》2017年硕士论文

【摘要】：闸墩是泄水建筑物的关键组成部分,闸墩结构对整个水利枢纽的安全运行至关重要。随着水利事业的快速发展,大流量、高水头泄水建筑物越来越多,对闸墩承载力的要求也越来越高。由于地形地质条件、枢纽布置等因素影响,闸墩厚度受到限制,不可能通过无限增加闸墩厚度来满足对闸墩承载能力不断增加的要求。预应力闸墩的应用,一定程度上解决了闸墩承载力不足问题,但预应力锚索的应力松弛、闸墩抗震性能的提高等问题还不能得到有效解决。型钢混凝土具有承载能力强、刚度大、延展性能好等特点,将型钢混凝土应用于闸墩来提高其承载力已有一定数量的研究成果,但基本都是集中在闸墩每侧只布置一根型钢的研究,还尚欠缺墩体内布置多根型钢的研究。本文在型钢混凝土闸墩已有的研究基础上结合闸墩应力分布等特点,在闸墩中布置多根分布式型钢来研究型钢布置形式对弧形闸门型钢混凝土闸墩工作性能的影响。本文利用有限元软件ANSYS,采用弧门支座附近闸墩的局部受拉区的配钢量不变原则,分别建立单型钢和多型钢闸墩有限元模型。根据闸墩应力分布等特点,将多型钢闸墩内型钢数量设定为两根和三根,并分别以20°、25°、30°、40°四种不同的扩展角进行布置。本文从闸墩位移、应力、裂缝分布和承载能力等方面研究了型钢布置形式对闸墩工作性能的影响。研究结果表明:(1)闸墩在对称荷载作用下,保持型钢之间扩展角不变,闸墩最大位移随型钢数量增加而减小;保持型钢数量不变,闸墩最大位移随着扩展角的增加先减小后增大。非对称荷载作用下,扩展角为20°、25°时,墩体内布置两根型钢的闸墩最大位移较小;扩展角为30°、40°时,墩体内布置三根型钢的闸墩最大位移较小。保持型钢数量不变,闸墩最大位移随着扩展角的增加先减小后增大。(2)闸墩在对称荷载作用下,保持型钢之间扩展角不变,多型钢闸墩控制点应力随型钢数量增加而减小;保持墩体内型钢数量不变,闸墩控制点应力随着扩展角的增加先减小后增大。非对称荷载作用下,墩体内型钢数量对闸墩控制点应力影响不大;保持墩体内型钢数量不变,闸墩控制点应力随着扩展角的增加逐渐增大。(3)多型钢闸墩比单型钢闸墩裂缝发展慢。对称荷载作用下,多型钢闸墩不同布置形式对闸墩裂缝发展影响不大。非对称荷载作用下,型钢之间扩展角对多型钢闸墩裂缝发展有较大影响,在裂缝初期,扩展角较小的闸墩裂缝发展较慢;随着裂缝的扩散,扩展角较大的闸墩裂缝发展较慢,裂缝超过型钢布置范围后在闸墩内扩散速度加快。布置型钢数量对多型钢闸墩裂缝发展影响不大。(4)闸墩在对称荷载作用下,保持型钢之间扩展角不变,闸墩承载能力随着型钢数量的增加逐渐增强;保持型钢数量不变,闸墩承载能力随着扩展角的增加先增强后减弱。非对称荷载作用下,保持型钢之间扩展角不变,墩体内布置两根型钢的闸墩承载能力最强;保持型钢数量不变,闸墩承载能力随扩展角增加逐渐减弱。(5)从闸墩位移、应力、裂缝发展情况和承载能力等方面综合考虑,型钢混凝土闸墩内采用三根型钢以25°扩展角进行布置时为相对较好的布置形式。
[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.

【学位授予单位】：广西大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TV65

【参考文献】