Secondly it need to warm the steels to the definite temperature in the accordion pipe by electrifying, measure the length of the steels, compare it with the result of computing theory.

• 从实验上,通过对单位长度的钢筋电热性能的了解,然后再对穿过波纹管的钢筋进行通电加热,当加热到一定的温度下测出其伸长率,与理论计算值对比。