摘要
为明确上弦杆截面变化对拱式渡槽结构受力性能的影响,优化拱式渡槽结构上弦杆截面尺寸。文中以一跨度40 m,矢高7.4 m的上承式空腹桁架拱式渡槽为研究实例,利用三维有限元软件MIDAS/CIIVL建立上弦杆不同截面尺寸的空腹桁架拱模型,分析上弦杆截面尺寸变化对该拱式渡槽支撑结构体系——上承式空腹桁架拱各组成杆件受力性能的影响。结果表明:上弦杆截面尺寸变化对其自身、拱脚、下弦杆的变形、应力等受力性能有较大影响,对渡槽整体结构的稳定性影响也较大,对支撑结构其他组成构件的受力性能影响较小。在满足混凝土抗拉、抗压强度设计规范的基础上,为使该渡槽结构既安全又经济,建议选用上弦杆截面尺寸为30 cm×45 cm的方案较为合理。
In order to clarify how the changes of the upper rib section affect the performance of the mechanical behavior of arch - type aqueduct structure, and to optimize the section size of the upper rib of the structure of the arch aqueduct, taking a span of 40 m, 7.4 m height of the deck truss arch aqueduct as a research example, different section size models of top rib are established by using three dimensional finite element analysis software MIDAS/CIIVL. The effect of the change of the top rib section size on the mechanical behavior of the arch aqueduct support structure system are ana-lyzed and discussed. Results show that the change of top chord section dimension has a greater im-pact on itself, the arch of the foot and the bottom rib of the deformation and stress of the mechanical performance. In addition,the influence on the stability of the overall aqueduct structure is large, but is small on the other components of the support structural. On the base of meeting the concrete tensile strength and compressive strength design specification,in order to make the aqueduct struc-ture safe and economic, it is more reasonable to choose the scheme that the top rib section size is 30 cm × 45 cm.
出处
《青海大学学报（自然科学版）》
2017年第4期84-90,共7页
Journal of Qinghai University(Natural Science)
关键词
拱式渡槽
上弦杆截面
拱脚
受力性能
屈曲分析
有限元
arch aqueduct
arch rib section
the foot of arch
mechanical characteristics
analysis
