首页|用于夹层梁静动力及屈曲分析的新型组合结构单元

用于夹层梁静动力及屈曲分析的新型组合结构单元

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推导出新型组合结构单元，用于考虑界面滑移的 3 层部分作用夹层组合梁的静动力及屈曲特性分析。基于铁木辛柯梁理论，建立考虑夹层梁部分作用效应的能量原理。针对其受力特性，在节点位移、横截面转角和界面滑移插值时均采用含内部自由度的高阶插值函数，以解决含界面有限元数值分析中常遇到的"滑移锁定"现象。通过变分原理得到夹层梁的刚度矩阵、质量矩阵以及几何刚度矩阵的显示表达式。基于MATLAB编译相应夹层结构的有限元程序并验证其准确性。对不同截面 3 层夹层组合梁进行不同荷载条件和边界条件下的静动力及屈曲特性分析，并探讨不同夹层组合梁跨高比和不同界面抗剪连接刚度下的计算结果及其误差的变化规律。所推导的显示表达式新型组合结构单元计算效率高，并便于推广应用于其他有限元程序或商业软件子程序中。
New composite finite element for static,dynamic and buckling analysis of sandwich composite beams
A new composite finite element of a three-layer partial-interaction sandwich composite beam with interlayer interfacial slip was derived for static,dynamic and buckling analysis.The partial-interaction effects of the sandwich beam were considered by deriving the energy principle based on the Timoshenko beam theory.Then a high-order interpolation function with internal degrees of freedom was used for determining the nodal displacement,section rotary angle and interfacial slips of the sandwich beam,which could solve the frequent"slip locking"phenomenon in numerical analysis.The explicit stiffness matrix,mass matrix and geometric stiffness matrix of the sandwich beam were obtained through variational principle.The accuracy of the proposed composite finite element for the corresponding sandwich structure was verified through the numerical program which was developed based on the MATLAB software.The static,dynamic and buckling analysis of the three-layer sandwich beam with different cross-sections were then carried out,under the circumstances of various loads and different boundary conditions.The variation laws of the calculation results and their errors of sandwich composite beams with different span-depth ratios and different interfacial shear stiffnesses were also analyzed.The proposed composite finite element with explicit expressions has high calculation efficiency and is easy to be applied into other finite element programs or commercial software subroutines.

sandwich composite beampartial-interactionstatic and dynamic analysisstiffness matrixmass matrixTimoshenko beam theory

林建平、陈昆、潘剑超、王冠楠、冯倩

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华侨大学土木工程学院,福建厦门 361021

福建省智慧基础设施与监测重点实验室(华侨大学),福建厦门 361021

浙江大学建筑工程学院,浙江杭州 310058

公路数智养护浙江省工程研究中心,浙江杭州 310058

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夹层组合梁 部分作用 静动力分析 刚度矩阵 质量矩阵 铁木辛柯梁理论

国家自然科学基金资助项目国家自然科学基金资助项目国家自然科学基金资助项目浙江省'尖兵''领雁'研发攻关计划资助项目福建省自然科学基金资助项目浙江大学-浙江交工协同创新联合研究中心资助项目厦门市自然科学基金资助项目

5237815812322206120023032022C011432023J01106ZDJG20210023502Z20227200

2024

10.3785/j.issn.1008-973X.2024.03.009

浙江大学学报(工学版)
浙江大学

浙江大学学报(工学版)

CSTPCD北大核心
影响因子：0.625
ISSN：1008-973X
年,卷(期)：2024.58(3)
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