混凝土圓柱劈裂試驗應力分佈及裂縫行為之研究

A Study on Stress Distribution and Crack Behavior of Concrete Cylinder Splitting Test

王文宏(Weng-Hone Wang) ； 陳清泉(Ching-Churn Chern)

《中國土木水利工程學刊》 23卷2期 (2011/06) Pp. 195-208

https://doi.org/10.6652/JoCICHE.201106_23(2).0007

摘要

混凝土圓柱試體進行劈裂試驗時，其達到破壞時裂縫分佈之型式，依ASTM C496文獻認知，裂縫發生於沿平行於試體受力直徑方向上，試體元素之力學行為而言，在平行於受力直徑方向上承受壓力，在垂直方向上承受拉力，其破壞機制為壓拉破壞。然劈裂試驗之應力及能量分佈未作研究，本研究除對圓柱試體進行劈裂試驗以觀察裂縫機制之發展模式，並藉重彈性理論分析平行及垂直方向直徑上應力分佈，再輔以有限元素法分析試體剖面能量分佈狀態，探討等應力線、梯度方向及等能量線分佈，藉以建立劈裂試驗破壞機制之較合理模式。

關鍵字

等應力線 ； 梯度方向 ； 等能量線

並列摘要

The fractural pattern after splitting test for concrete cylinder is traditionally expressed as the cracks passing along the direction parallel to test loading, in according to the specification of ASTM C496. The elements are under tension in the direction perpendicular to loading and under compression in the direction parallel to loading thus this behavior is so called compression-tension fracture mechanism. However, the stress distribution and energy distribution for the specimen were not well examined and explained. The cracking model, stress distribution and energy distribution for the specimen of splitting test will be well investigated and presented in this paper. The stress distribution in main directions can be analyzed by using elasticity approach and the energy distribution of cross section can be figured out by finite element method. Also the fracture pattern after splitting test can be sketched by equivalent stress curves, including gradient direction and equivalent energy curves.

並列關鍵字

equivalent stresses lines ； the gradient direction ； equivalent energy lines