https://drive.google.com/file/d/1UCCX-psjPu1lTWHOMoPXjyZrk-NnJYo9/view?usp=sharing
一直希望用漫長的學習人生去慢慢一個個structural calculation excel 整出來，整教學和公式的根據。 希望而家職位低微唔會令我放棄呢個興趣。
石矢lap length
取決因素:
steel bar strength
Under tension or compression
concrete strength
根據steel bar 和 石矢的接觸面愈大,黏力愈大
steel bar接觸面的formula 係: 2R*PI()*Length
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Tuesday, January 7, 2020
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