strain test

On the basis of the static strain test and crack observation for type D-T, pre stressed concrete sleepers, by means of curve fitting to the test data in the sense of least square,the strain of concrete and steel wire,the position of neutral axis and other mehcanical parameters are determined.

以DT—1型预应力混凝土轨枕静态应变试验和裂缝观测为基础，通过对试验数据在最小二乘意义下的曲线拟合处理，可以确定轨枕在某一使用状态时混凝土应变、钢丝应变和中性轴位置等力学参数；同时，对轨枕控制截面的力学性能进行了分析。