摘要
不同荷载工况下拱轴线形对拱结构的内力分布及位移变形影响显著。为探究不同典型拱轴曲线的承载性能,通过对任意荷载作用下两铰拱的支反力及截面内力分析求解,推导建立了标准圆曲线拱、椭圆拱、抛物线拱及悬链线拱的拱轴方程,结合有限元分析探讨了不同拱轴线形的拱结构在全跨均布荷载与半跨均布偏载作用下拱结构的支座反力、拱轴内力和拱轴变形规律。研究结果表明:拱结构的支座反力与荷载布置方式关系密切;拱轴线形变化对拱轴轴力影响不大,但对拱轴弯矩分布影响突出;椭圆线拱轴相较抛物线拱轴的拱结构内力分布及位移变形对荷载变化的适应性低。
The arch axis alignment has a significant influence on the internal force distribution and displacement deformation of arch structure under different loading conditions. In order to explore the bearing performance of different typical arch axis curves,through the analysis and solution of the supporting force and section internal force of two-hinged arch under arbitrary load,the arch axis equations of standard circular curve arch,elliptical arch,parabolic arch and catenary arch are deduced and established. Combined with finite element analysis,the bearing reaction force,section internal force and arch axis deformation law of arch structure with different arch axis alignment under the effects of full-span load distribution and half-span partial load distribution are discussed. The results show that the bearing reaction of the arch structure is closely related to the load arrangement,and the change of archaxis shape has little influence on the axial force of arch axis,but has a prominent influence on the bending moment distribution of arch axis. Compared with the parabolic arch axis,the internal force distribution and displacement deformation of the elliptical arch axis are less adaptable to the load change.
作者
程麦理
王弘起
马越
李大卫
应仟壹
CHENG Maili;WANG Hongqi;MA Yue;LI Dawei;YING Qianyi(School of Civil Engineering,Yan’an University,Yan’an 716000;SCEGC NO.13 Construction Engineering Group Company Ltd.,Yan’an 716000,China)
出处
《延安大学学报（自然科学版）》
2022年第4期1-6,共6页
Journal of Yan'an University：Natural Science Edition
基金
国家自然科学基金项目(51807479)
陕西省自然科学基础研究计划项目(2018JQ5217)
延安市科技计划项目(SL2019ZCSY)
延安大学大学生创新创业训练项目(D2021038)。
关键词
两铰拱
拱轴线形
承载性能
截面内力
支座反力
拱轴变形
two-hinged arch
arch axis shape
bearing performance
internal force of cross section
support reaction
arch axis deformation
