MỘT SỐ BÀI TẬP MINH HỌA CHO NỘI DUNG THI ĐÃ PHỔ BIẾN CHO SINH VIÊN (Dạng liên kết, tải trọng, hình học mặt cắt ngang,… có tính tham khảo để minh họa cho nội dung ôn tập) January 8, 2021 I Internal force Prob Determine the resultant internal normal force, shear force, and bending moment at point C in the beam (F1-1, F14, page 16) I Internal force Prob Find the resultant internal loading acting on the cross section at point A (P1-1, page 15) Prob The blade of the hacksaw is subjected to a pretension force of F = 100 N a) Determine the resultant internal loadings acting on section a–a that passes through point D b) Determine the resultant internal loadings acting on section b–b that passes through point D II Bending stress & Shear stress Prob The beam shown in Fig a has a cross-sectional area in the shape of a channel, Fig b Determine the maximum bending stress and shear stress that occurs in the beam at section a–a (Example 6.13, page 299) Prob If the beam is subjected to a moment of M = 100 kN.m and a shear force Q = 40 kN a) Determine the bending stress at points A, B, and C; sketch the bending stress distribution on the cross section (P6-80, page 307) b) Determine the maximum shear stress that occurs on the section c) Determine equivalent stress at point D (using maximumdistortion energy theory of failure – TB4) Q D III Strength verification & Deflection of a beam Prob a) Draw the shear and moment diagrams for the beam; b) If d = 450 mm, determine the absolute maximum bending stress in the overhanging beam; c) If the allowable bending stress is allow = MPa, determine the minimum dimension d of the beam’s cross-sectional area to the nearest mm (P6-100/101, page 309) d) If the modulus of elasticity (Young’s modulus) is E, find the vertical displacement of point C and the rotational angle of the section at C (Using Vereshchagin's rule) C III Strength verification & Deflection of a beam Prob Determine the displacement at point C EI is constant (P14-87, page 775) (Using Vereshchagin's rule) III Strength verification & Deflection of a beam Prob a) Draw the shear and moment diagrams for the beam b) Determine the minimum dimension b to the nearest mm of the beam’s cross section to safely support the load The wood has an allowable normal stress of allow = 12 MPa and an allowable shear stress of allow = 1.5 MPa (F11-5, page 556) b) Determine the displacement at point C as a function of b and EI (EI is constant) C IV Combined loading Prob The tubular shaft has an inner diameter of 15 mm Determine to the nearest millimeter its minimum outer diameter if it is subjected to the gear loading The bearings at A and B exert force components only in the y and z directions on the shaft a) Use an allowable shear stress of allow = [] = 70 MPa, and base the design on the maximum shear stress theory of failure (TB3) (P11-39, page 589) b) Use the maximum-distortion energy theory of failure (TB4) with allow = [] = 80 MPa V Statically Indeterminate Prob Determine the reactions at the supports, then draw the shear and moment diagrams EI is constant (P12-118, page 674) Prob Determine the reactions at the supports, then draw the shear and moment diagrams EI is constant (P12-123, page 674) ... the beam is subjected to a moment of M = 100 kN.m and a shear force Q = 40 kN a) Determine the bending stress at points A, B, and C; sketch the bending stress distribution on the cross section (P6-80,... through point D II Bending stress & Shear stress Prob The beam shown in Fig a has a cross-sectional area in the shape of a channel, Fig b Determine the maximum bending stress and shear stress that... Determine the resultant internal normal force, shear force, and bending moment at point C in the beam (F1-1, F14, page 16) I Internal force Prob Find the resultant internal loading acting on the cross