Cyclopedia of architecture, carpentry, and building : a general reference work (1912)
American Technical Society · Chicago : American Technical Society · leaf 251
5-1,900 X 22.5-950x30+ 7,600 X 30 = 0; or, -1,900x7.5-1,900x15-1,900x22.5-950x30+7,600x30Fi-- j5 = 7,600 pounds Since the sign of Fj is plus, the stress in rk is tensile. 203 70 STATICS Now lay off KR to represent the value of the stress in Jcijnst found, and then construct the polygon for joint 4.… … FGHIJ polygon for joint 6 or joint 7; for 6 it is PDEQP, EQ and QPrepresenting the stresses in eq and qp. At joint 7 there is nowbut one unknown force, namely, that in qr. The polygon for thethree others at that joint is ROPQ; and since the unknown forcemust close the polygon, QR must represent…
Architecture · Building
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