钢管混凝土抛物线空腹拱平面内稳定性能  

In-plane Stability of Concrete-filled Steel Tubular Parabola Virendeel Arches

作　　者：陈立旗 袁波[1,2] CHEN Li-qi;YUAN Bo(Space Structures Research Center, Guizhou University, Guiyang 550025, China;Key Laboratory of Structural Engineering of Guizhou Province, Guiyang 550025, China)

机构地区：[1]贵州大学空间结构研究中心,贵阳550025 [2]贵州省结构工程重点实验室,贵阳550025

出　　处：《科学技术与工程》2022年第14期5752-5759,共8页Science Technology and Engineering

基　　金：国家自然科学基金(51168010)。

摘　　要：钢管混凝土抛物线空腹拱是在钢管混凝土桁架拱上取消斜腹杆的拱结构。采取理论推导和数值模拟相结合的方式,对钢管混凝土抛物线空腹拱的平面内稳定性能进行深入研究。首先,使用有限元软件建立钢管混凝土圆管拱模型,与实验进行对比,证明建模方法的正确性。其次,推导出钢管混凝土抛物线空腹拱的换算长细比,并基于ABAQUS软件的分析结果,采用考虑矢跨比的轴压稳定系数公式,发现该公式能预测有限元计算结果。再次,对跨中加载和半跨加载分别进行一阶线弹性分析,研究钢管混凝土抛物线空腹拱中压力和弯矩的变化规律,并分析不均匀轴力和不均匀弯矩对压弯设计公式的影响。最后,推导出空腹拱的全截面塑性弯矩公式,根据二分法原理利用Python语言求出全截面塑性弯矩的数值,并根据有限元的计算结果,提出压弯共同作用下钢管混凝土抛物线空腹拱的设计公式,使其能用于指导工程实践。Concrete-filled steel tubular parabolic vierendeel arch is a new kind of arched without diagonal web member on concrete-filled steel tubular parabolic truss arches.The concrete-filled steel tubular parabolic vierendeel arches was investigated by adopting methods of theoretical derivation and numerical simulation.Firstly,the finite element software was used to establish the model of concrete-filled steel tubular circular arch,which was compared with the experiment to prove the correctness of the modeling method.Then,the equivalent slenderness ratio of concrete-filled steel tubular parabolic Vierendeel arch was derived.Based on the analysis results of ABAQUS,the axial compression stability coefficient formula considering rise span ratio was adopted.It was found that the formula can predict the finite element calculation results.What's more,the first-order linear elastic analysis of mid span load and half span load was carried out to study the variation of pressure and bending moment in concrete-filled steel tubular parabolic vierendeel arch,and the influence of non-uniform axial force and non-uniform bending moment on the design formula was analyzed.Finally,the plastic bending moment formula of the full section of the vierendeel arch was deduced,and the plastic bending moment of the full section was calculated by using Python and dichotomy method.According to the calculation results of the finite element method,the design formula of concrete-filled steel tubular parabolic vierendeel arch under the combined action of bending and compression was put forward,so that it can be used in guiding engineering practice.

关 键 词：钢管混凝土抛物线空腹拱 换算长细比 平面内稳定 全截面塑性弯矩 压弯共同作用 

分 类 号：TU393.3[建筑科学—结构工程]