[請益] 側邊垂直筋的剪力貢獻
最近碰到一個案，想了解這部分做法是否有問題。
考慮一矩型斷面，當梁的深度較深時，
技師在斷面左右兩側各配置一排類似主筋、但較小號的鋼筋，
間距從中性軸起算、上下皆每10cm排一根，如下圖所示：
http://i.imgur.com/xbRsmqg.jpg?1
請問像這樣配在兩側的小號主筋，是否具抗剪功能？
技師是說在算其貢獻之剪力強度時，
可直接採Av*fy*d/S (因為跟垂直箍筋差90度，所以式子相同，其中S=10cm) 來算。
請問這樣的算法是否合理？
謝謝各位幫忙。
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