拟协调等腰梯形薄板弯曲元和薄壳元

用拟协调方法推导了正交各向异性等腰梯形薄板弯曲元和薄平面壳元的显式刚度阵。计算结果表明，这种单元由于不需要进行数值积分，收敛愉、精度好，具有良好的适用性和可靠性。该单元已装配到ＤＤＪＴＪＱ程序系统中。

Quasi-conformal trapezoidal element for orthotropic thin plate and thin shell

Based on the quasi-conformal technique,an isoscales trapezoidal element foranalysing the thin plate and thin shell with isotropic and orthotropic material is developed.Thecomputer program of the element is coded and intdroduced into DDJTJQ,which is a generalpurposed finite element program developed by Research Institute of Engineering Mechanics ofDalian University of Technology in China,for static and buckling analysis of the engineeringstructures.The calculation of element stiffness matrix is simple without numerical integration.The numerical examples show that the element has higher accuracy and faster convengence rate.