問題詳情
38. 如圖 ( 十一 ) 所示在中央 ( L / 2 ) 處承受集中負荷 P = 2880 N 的簡支樑，樑長度 L = 6 m，其橫截面為寬度 b 高度 h 的矩形，已知 h = 4 b，若欲安全承受此集中負荷作用，且樑的容許彎曲應力為60MPa，不計簡支樑本身的重量，則此矩形橫截面的最小尺寸為多少？ 
(A) 40mm× 160mm
(B) 30mm× 120mm
(C) 20mm× 80mm
(D) 10mm× 40mm
(A) 40mm× 160mm
(B) 30mm× 120mm
(C) 20mm× 80mm
(D) 10mm× 40mm
參考答案
答案：B
難度：適中0.510638
統計：A(6),B(48),C(16),D(4),E(0)
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