| 钢管混凝土空腹结构的双重非线性简化分析方法 |
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| 引用本文： | 孙潮,陈宝春.钢管混凝土空腹结构的双重非线性简化分析方法[J].公路交通科技,2009,26(8). |
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| 作者姓名： | 孙潮 陈宝春 |
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| 作者单位： | 福州大学土木工程学院,福建,福州,350108 |
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| 摘 要： | 采用考虑剪切变形的Timoshenko梁的刚度矩阵,用抗剪刚度和抗弯刚度之比来考虑剪切变形对抗弯刚度的影响,得出空腹结构连续化成一根杆件的刚度矩阵.在单元刚度计算时,弦杆(或柱肢)和腹杆均采用了有效轴压刚度,考虑了空腹结构组成杆件的初弯曲对整体结构稳定的影响.采用FORTRAN语言编制了程序.算例表明简化算法计算结果与传统杆系模型有限元方法计算结果吻合良好,用于钢管混凝土空腹结构的极限承载力分析,可大幅度减少单元数,从而简化计算,节省机时.探讨了相关屈曲和剪切变形对钢管混凝土空腹结构极限承载力的影响.研究结果表明,随着长细比的增大,剪切变形影响逐渐减小,随着弦杆与腹杆的面积比的增大,剪切变形影响增大.对于钢管混凝土格构柱,当λ1>λ(λ1为柱肢长细比;λ为柱整体长细比)时,发生柱肢局部屈曲失稳;当λ1<λ时,发生整体屈曲失稳;在λ1=λ及其附近时,柱肢与整体的相关屈曲最明显.
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| 关 键 词： | 桥梁工程 相关屈曲 有限元 钢管混凝土 空腹结构 非线性 剪切变形 |
Simplified Dual Nonlinear Analysis Method of CFST Laced Structure |
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| SUN Chao,CHEN Baochun.Simplified Dual Nonlinear Analysis Method of CFST Laced Structure[J].Journal of Highway and Transportation Research and Development,2009,26(8). |
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| Authors: | SUN Chao CHEN Baochun |
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| Institution: | School of Civil Engineering;Fuzhou University;Fuzhou Fujian 350108;China |
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| Abstract: | Based on continuous assumption,laced CFST member can be simplified as a beam element.Stiffness matrix of Timoshenko beam was adopted to calculate the equivalent solid member stiffness matrix of the laced structure,in which the ratio of shear rigidity to bending rigidity was taken into account.Efficient axial rigidity was used in the element stiffness matrix to consider initial deformation influence on ultimate stability load-carrying capacity.A program of finite element method in FORTRAN language was presen... |
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| Keywords: | bridge engineering correlative buckling finite element concrete-filled steel tube (CFST) lacedstmcture nonlinearity shear deformation |
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