【本著作除另有註明外，採取創用CC「姓名標示－非商業性－相同方式分享」臺灣3.0版授權釋出】

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1 【本著作除另有註明外，採取創用CC「姓名標示－非商業性－相同方式分享」臺灣3.0版授權釋出】
National Taiwan University Material Mechanics Chapter Five Stresses in beams 2014 Summer 國立臺灣大學土木工程學系 黃尹男 教授 【本著作除另有註明外，採取創用CC「姓名標示－非商業性－相同方式分享」臺灣3.0版授權釋出】

2 Stresses in beams Class 1. Introduction
Class Pure bending & Non-uniform bending Class Curvature of a beam Class Longitudinal Strains in Beams Class Normal Stresses in Beams (Linearly Elastic Materials) Class Design of Beams for Bending Stresses Class Shear Stresses in Beams of Rectangular Cross Section Class Shear Stresses in Beams of Circular Cross Section Class Shear Stresses in the Webs of Beams with Flames Class 10. Built-Up Beams and Shear Flows

3 Built-Up Beams and Shear Flows
Class 10 Built-Up Beams and Shear Flows

4 Built-Up Beams and Shear Flows

5 Built-Up Beams and Shear Flows
Areas Used When Calculating First Moment Q Built-Up Beams and Shear Flows 考試必考「找Area」，找錯就直接掰掰囉~

6 Built-Up Beams and Shear Flows
where Fweld = force resisted per unit length of weld F = allowable force for each nail/bolt s = the corresponding spacing of nail/bolt n = number of weld/nail/bolt.

7 Built-Up Beams and Shear Flows
Example A beam box is to be constructed from four boards nailed together as shown in the figure. If each nail can support a shear force of 30 N, determine the maximum spacing s of nails at B so that the beam will support the vertical force of 80 N. [PS]木板截面：1.5cm x 6.0cm Built-Up Beams and Shear Flows B s 80N

8 Built-Up Beams and Shear Flows
Key point 在於 「選擇正確的Area」 如果要算B的剪力流 Area就必須取這樣 Built-Up Beams and Shear Flows 想一想為什麼? (如果一時沒想通 (建議先按下暫停鍵

9 Built-Up Beams and Shear Flows
接下來就只是純粹代公式… Built-Up Beams and Shear Flows 有左右兩邊平分

10 Built-Up Beams and Shear Flows
如果今天是求C點呢?? Built-Up Beams and Shear Flows C

11 重點回顧 [材力小語] 一定要知道如何選擇「計算Q的Area」阿…

12 4 5 7 頁碼 作品 版權圖示 來源/作者 1-13 版權聲明 [李星慧_2014 . 7. _高雄攝影作品] 此圖經同意已進行藍階修改。
您如需利用本作品，請另行向權利人取得授權。 4 國立交通大學機械工程系 鄭文雅 教授，本作品以創用 CC BY-NC-SA 臺灣 3.0 版授權釋出。 5 7 版權聲明

13 頁碼 作品 版權圖示 來源/作者 7-10 國立交通大學機械工程系 鄭文雅 教授，本作品以創用 CC BY-NC-SA 臺灣 3.0 版授權釋出。 版權聲明