不同长度和直径桩核的三维光弹性应力分析

目的 对比不同长度和直径的桩核受力后应国分布情况。方法 根据桩的长短、粗细胞将实验分成四组，通过垂直和斜向加载，采用三维光弹性应力冻结法，经模型切片观察计算出模型各测点的最大剪应力。结果 桩的直径增加根尖区最大剪应力相应增高，桩核交界处和核与根面交界面最大剪应力的明显增高。桩的长度增加，应力分布更为均匀。结论 从抗力固位角度出发有一定和蔗的粗细合适的柱形桩核较为理想。

Three-dimensiopal Photoelastic Stress Analysis of Post-core with different Lengh and Diameter

Objective To compare the stress distribution of post cores with different length and diameter after loading. Methods Post cores were divided into four groups according to their length and diameters. Slices of the models were observed and maximal shear stress of each testing point was calculated through 3 dimensional photoelastic stress freezing method,after vertical and oblique loading. Result With the increasing of diametes of post cores the maximal apical shear stress increased accordingly, especially those at the post core junction as well as the core root junctional surface. The longer the post, the more even the stress distribution was. Conclusion From the anti force and retentive points of view, cylindrical post core with a propes length and diameter would be ideal.