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Share questions and knowledge in the civil engineer promotion exam.

2025/9/8 Edited to

... Read moreในประสบการณ์การเตรียมตัวสอบเลื่อนขั้นสามัญวิศวกรโยธา สิ่งที่ผมพบว่าช่วยได้มากคือการทำความเข้าใจสูตรหลักอย่างโมดูลัสยืดหยุ่น (Modulus of Elasticity) และโมเมนต์ความเฉื่อย (Moment of Inertia) ซึ่งเป็นหัวใจสำคัญในการวิเคราะห์โครงสร้างคอนกรีตและการออกแบบ ทางผมได้ศึกษาหน้าตัดคอนกรีตเสริมเหล็กและการคำนวณแรงดัดแบบต่างๆ โดยใช้สูตรและแผนภาพต่างๆ เช่น การคำนวณ Deflection, Flexural Stress และ Buckling ของเสา พร้อมทั้งเข้าใจการกระจายแรงเฉือนและโมเมนต์ดัดบนเสาเข็มและคาน ซึ่งข้อมูลเหล่านี้ช่วยทำให้ผมตอบคำถามสอบได้แม่นยำขึ้น จากภาพที่แนบมาทำให้เห็นตำแหน่งการเจาะคานที่เหมาะสมและไม่เหมาะสม ซึ่งเป็นเรื่องสำคัญเพราะถ้าพลาดจุดนี้อาจทำให้โครงสร้างเสียสมดุลได้ นอกจากนี้ ผมยังได้เรียนรู้เกี่ยวกับแรงอัดของคอนกรีตในรูปทรงต่างๆ และวิธีการทดสอบ Slump test เพื่อประเมิน Workability ของวัสดุที่ใช้ สิ่งที่อยากแชร์ก็คือการฝึกทำความเข้าใจกราฟ Stress-Strain และจุดสำคัญต่างๆ เช่น Yield, Ultimate และ Fracture ซึ่งทำให้ผมมองเห็นภาพรวมการทำงานของวัสดุภายใต้แรงต่างๆ ได้ชัดเจนขึ้น การมีความรู้เรื่อง Ro-Balance สำหรับหน้าตัดคอนกรีตเสริมเหล็กแบบ Under Reinforced และ Over Reinforced Concrete ก็เป็นประโยชน์ ช่วยให้เข้าใจข้อดีข้อเสียและสามารถออกแบบโครงสร้างได้เหมาะสม สุดท้าย การศึกษาทุกหัวข้อควบคู่กับการลองวาดแผนภาพ SFD และ BMD เอง ทำให้ผมเข้าใจการกระจายแรงและโมเมนต์ได้ดียิ่งขึ้น และพร้อมสำหรับการสอบจริงอย่างมั่นใจ ขอแนะนำให้ทุกคนเน้นความเข้าใจจริง ไม่ใช่แค่ท่องจำสูตรอย่างเดียวครับ

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