井式梁的最大弯矩及剪力系数应予修正

本文运用有限单元法对《建筑结构静力计算手册》中的几种平面形状的井式梁进行了分析计算,将其内力与查系数算得的结果比较,发现按系数表近似计算的M、V值并不一定是该梁的最大弯矩及剪力。井式梁楼盖梁自重简化为梁上均布线荷载,板面荷载简化为作用梁上的三角形或梯形荷载,所算得的结果比较正确。提出应对《手册》中井式梁内力系数予以修正,以免结构设计人员采用查系数计算井式梁内力而引起较大误差。

MODIFICATION OF MAXIMUM BENDING MOMENT AND SHEAR COEFFICIENT IN GRIDER

In this paper, finite element method is used to analyse several typs of plan grider which are stated in Manual of static Analysis for Building Structures. By comparing the internal force from the presented method with that, from the Manual, it is discovered that moments and shears calculated in terms of the coefficients from the manual is not always the maximum.when the dead loads of grider roofs are simplified to uniform loads applied on grider and face loads to trignlar or ladder shape load, the calenlated results are comparazively correct. The internal force coefficient of grider stated in Manual should be modified in order to avoid generating langer errors when structural designers calculate the internal force of grider in terms of coefficient from the manual.