基于ANSYS的小箱梁截面优化设计

发布时间：2018-07-02 12:53

本文选题：截面优化 + 小箱梁　；参考：《东北林业大学》2014年硕士论文

【摘要】：在中小跨径的简支转连续桥梁中,主梁截面形式主要有T形、空心板、工字形、箱形、组合箱形等。其中箱形截面被广泛应用是基于其截面特点优于其他截面形式,结构受力上箱梁为闭口薄壁截面,具有较好的截面抗弯和抗扭刚度,能有效的抵抗汽车荷载、风荷载和自重等引起的弯矩和扭矩。相比T形截面梁横向偏载下的各片梁受力更加的均匀,其受力整体性好；预制梁截面高度与宽度一般相差不大,使得梁体在施工与使用过程中都具有较好的稳定性；从美观角度上看,箱梁截面外形简洁,线条简单明了,适用于跨线桥、立交桥等。正是由于箱型截面梁桥的广泛应用所以对箱梁截面尺寸的优化以取得更好的经济效益具有非常重要的实用意义。本文依托实际工程项目,通过梁体预制施工时预埋混凝土传感器,待成桥时对箱梁桥进行荷载试验,对加载下的桥梁进行应变和挠度的测量。利用ANSYS有限元软件建立箱梁模型,模拟实际试验荷载作用下的箱梁桥,通过有限元分析后与实测数据对比分析,验证了有限元模型的合理性。按照上面的建模规则建立优化模型,利用ANSYS的优化模块,使用子问题近似法在满足规范要求的和使用条件下对设计荷载下的箱梁进行抗弯承载能力的截面优化设计,得出小箱梁的截面优化尺寸,并对其材料用量进行经济效益分析。
[Abstract]:In the small and medium span simply supported continuous bridge, the main beam section is mainly T-shaped, hollow slab, I-shaped, box-shaped, combined box, and so on. The box section is widely used because its cross section is superior to other sections, and the box girder is a closed thin-walled section, which has good flexural and torsional stiffness, and can effectively resist the vehicle load. Bending moment and torque caused by wind load and deadweight. Compared with T-section beam under transverse eccentric load, the beam has a more uniform force, its stress integrity is good, the section height and width of the precast beam generally have little difference, so the beam body has better stability in the construction and use process. From an aesthetic point of view, box girder section shape is simple, simple and clear lines, suitable for span bridges, overpasses, etc. Because of the wide application of box girder bridge, it is of great practical significance to optimize the section size of box girder in order to obtain better economic benefits. This paper relies on the actual engineering project, through the beam body prefabricated construction pre-buried concrete sensor, waiting for the bridge to complete the load test of the box girder bridge, the strain and deflection of the bridge under the load measurement. The box girder model is established by ANSYS finite element software, and the box girder bridge under the actual test load is simulated. The rationality of the finite element model is verified by comparing the finite element analysis with the measured data. The optimization model is established according to the above modeling rules, and the optimization model is established by using the optimization module of ANSYS, and the sub-problem approximation method is used to optimize the section design of the box girder under the design load, which meets the requirements of the specification and under the conditions of use. The optimum size of the cross section of the box girder is obtained, and the economic benefit of its material consumption is analyzed.
【学位授予单位】：东北林业大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U448.213;U442.5

【参考文献】