【摘要】 本文采用半解析有限元法建立了用于U型薄壳渡槽稳定性分析的柱壳有限条元模型,推导出了稳定性问题的特征方程,确定了渡槽结构失稳的临界应力,编制了相应的计算程序。通过与简支的单向受压板和四边简支单向纯弯板的稳定性问题的理论解的对比,验证了模型的合理性和精确性。计算结果说明,以结构的最大压应力小于失稳临界应力为准则,可对预应力U型薄壳渡槽稳定性进行判断。更多还原

【Abstract】 The semi-analytical finite element method is adopted to establish a finite element model for stability analysis of prestressed U-shaped thin shell aqueduct.The characteristic equation of the stability analysis is deduced and the corresponding computational program is developed.The reasonability and accuracy of the proposed model are verified by the theoretical stability analysis results of a simple supported plate under the action of uni-axial pressure and a simple supported plate bending in one direction.The critical stress during the failure of construction is deduced.The criterion of the aqueduct failure may define as whether the maximum stress in the structure is exceeded the critical stress or not.更多还原