I – Determine (approximately) the internal moments at joint H (M H ), at joint I (M I ) and reaction forces at A (Ax, Ay, M A ). 7 pts II – Determine (approximately) the internal moments at joint...

I – Determine (approximately) the internal moments at joint H (M_H), at joint I (M_I) and reaction forces at A (Ax, Ay, M_A). 7 pts

II – Determine (approximately) the internal moments at joint H (M_H), Joint D (M_D) and the support reactions at C (Cx, Cy, M_C). 7 pts

III –Determine (approximately) the support reactions at C (Cy, Cx, M_C). 5 pts

练习题 Determine (approximately) the reaction at the base of joint B. Use portal method of analysis. Please don’t forget each unit and its sign convention. A J I H G F E D R O C B K Q P S N M L 20 kN 30 kN Bx= By= M B = ? I – Determine (approximately) the internal moments at joint H (MH), at joint I (MI) and reaction forces at A (Ax, Ay, MA). 7 pts II – Determine (approximately) the internal moments at joint H (MH), Joint D (MD) and the support reactions at C (Cx, Cy, MC). 7 pts III –Determine (approximately) the support reactions at C (Cy, Cx, MC). 5 pts