HTY不对称斜交中承式钢管拱桥的变形和受力状态研究

发布时间：2018-01-14 22:14

本文关键词：HTY不对称斜交中承式钢管拱桥的变形和受力状态研究　出处：《中南大学》2014年硕士论文　论文类型：学位论文

【摘要】：摘要：HTY桥是一座1-90m不对称斜交中承式钢管拱桥。该桥两片拱肋在顺桥向错位15.4m,拱肋及其吊杆顺桥向和横桥向都不对称。全桥共有四排支座,每排两个,中支座处两个支座的连线与梁体轴线斜交成43。,梁体纵向为飘浮体系。该桥的结构形式和受力状态都很复杂。本文对该桥的施工过程和成桥状态的变形和受力状态进行了有限元分析,并对竖直、倾斜两种吊杆体系在活载作用下的受力性能进行了研究,主要工作和成果如下： 1、针对HTY桥的结构构造特点,对该桥的有限元模拟方法进行了研究。采用空间梁格法模拟纵横梁体系,对拱肋钢管和拱脚混凝土采用空间直梁单元模拟。 2、研究给出了恒载作用下每片拱肋的吊杆力。由于拱肋顺桥向和横桥向都不对称,单片拱肋吊杆顺桥向水平分力难以平衡。由本文给出的两片拱肋吊杆力作用于飘浮梁体顺桥向水平分力合力基本为零,单片拱肋吊杆作用于梁体顺桥向不平衡力较小,两片拱肋吊杆反方向的水平分力对梁体所形成的不平衡力矩也较小,可由支座横桥向的水平反力来平衡。 3、优化了施工过程,研究了恒载和最不利活载作用下的变形和受力状态。结果表明：施工过程中只在支架拆除前张拉吊杆和支架拆除前、后各张拉一次,桥梁的受力都是安全的；主力组合作用下,桥梁的强度和刚度满足要求。 4、计算分析了HTY桥在附加力作用下的变形和受力状态。结果表明：温度荷载在主梁中引起的变形和应力与最不利活载作用下的相当；风荷载引起的拱顶横桥向水平位移最大为48.6mm；支座不均匀沉降5mm对全桥的变形和受力状态影响较小。主力和附加力组合作用下桥梁的受力状态良好。 5、对采用竖直吊杆体系和倾斜吊杆体系两种情况在活载作用下的变形和受力性能进行对比研究,结果表明：两种吊杆体系主梁的内力和挠度差别较小,但倾斜吊杆体系拱肋的内力峰值和挠度较竖直吊杆体系的小。本文的研究成果为HTY桥设计提供了依据,对其他同类桥梁也有参考价值。图220幅,表14个,参考文献64篇。
[Abstract]:The W HTY bridge is a 1-90m asymmetrical skew through steel pipe arch bridge. The two arch ribs of the bridge are staggered 15.4 m in the direction of the forward bridge. The arch ribs and their suspenders are asymmetrical in the direction of the bridge and the transverse bridge. There are four rows of supports in the whole bridge, two in each row, and the line between the two supports at the middle support is skewed to the axis of the beam. The longitudinal beam is a floating system. The structure and stress state of the bridge are very complicated. The construction process of the bridge and the deformation and stress state of the bridge are analyzed by finite element method, and the vertical structure is analyzed in this paper. The mechanical behavior of two inclined suspenders under the action of live load is studied. The main work and results are as follows: 1. According to the structural characteristics of HTY bridge, the finite element simulation method of the bridge is studied. The spatial beam method is used to simulate the longitudinal and transverse beam system. The spatial straight beam element is used to simulate the arch ribbed steel tube and arch foot concrete. 2. Under the action of dead load, the suspender force of each arch rib is given because of the asymmetry of the direction of the arch rib along the bridge and the direction of the transverse bridge. It is difficult to balance the horizontal force of the single arch rib suspender. The force of the two arch ribbed suspenders acting on the floating beam is basically zero. The unbalance force of the single arch rib suspender acting on the beam is small, and the unbalanced moment of the horizontal split force of the two arch ribbed suspenders on the beam body is smaller, which can be balanced by the horizontal counterforce of the supporting transverse bridge. 3. The construction process is optimized, and the deformation and stress state under dead load and most unfavorable live load are studied. The results show that: in the construction process, only before pulling the suspenders before the removal of the support and before the removal of the support, after the tension once. The force of the bridge is safe; Under the action of the main force combination, the strength and stiffness of the bridge meet the requirements. 4. The deformation and stress state of HTY bridge under additional force are calculated and analyzed. The results show that the deformation and stress caused by temperature load in the main beam are equivalent to those under the most unfavorable live load. The maximum horizontal displacement caused by wind load is 48.6 mm. The bearing uneven settlement of 5 mm has little influence on the deformation and stress state of the whole bridge, and the stress state of the bridge under the combination of main force and additional force is good. 5. The deformation and mechanical behavior of the two systems under live load are compared. The results show that the difference between the internal force and deflection of the main beam of the two kinds of suspender system is small. However, the peak internal force and deflection of arch rib of inclined suspender system are smaller than that of vertical suspender system. The research results of this paper provide the basis for the design of HTY bridge, and also have reference value for other similar bridges. There are 220 figures, 14 tables and 64 references.
【学位授予单位】：中南大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U441;U448.22

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