考虑剪切效应的钢筋混凝土纤维梁单元徐变分析方法

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中图分类号：034；TU378.2 文献标志码：A 文章编号：1000-4939（2025）06-1330-10

Abstract：The classic fiber model based on Euler-Bernoulli beam theory overlooks the influence of shear deformation on the section of the beam.In order to establish a more accurate creep analysis method for reinforced concrete fiber beam elements ，this paper proposes a fiber beam element considering shear effects based on Timoshenko beam theory.The stiffness matrix of the fiber beam element is derived，and the finite element equation for the equivalent nodal force of creep analysis based on concrete creep analysis initial strain method is obtained.Finally，a finite element method for creep analysis of reinforced concrete fiber beam elements is established.A computing program is developed in FORTRAN language，and elastic analysis for normal beam and reinforced concrete beam，and creep analysis for reinforced concrete beam are conducted.The results are compared with analytical solutions，commercial software and other literature，indicating that the proposed method can accurately consider the shear efects and clearly define the behaviors of steel and concrete in the creep performance of reinforced concrete beams.Moreover，including steel in the creep analysis model can effectively improve the accuracy of the results.

Key words：reinforced concrete fiber beam element;creep;shear effect; Timoshenko beam theory;finite element analysis

经典的Euler-Bernoulli梁理论在实际工程结构分析中应用非常广泛，但由于未考虑剪切变形给截面带来的影响，在梁的高跨比较大时会有一定的误差[]。（剩余14155字）