A simple log bridge in a remote area consists of two parallel logs with planks across them (see figure). W 895 N/m intim

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A Simple Log Bridge In A Remote Area Consists Of Two Parallel Logs With Planks Across Them See Figure W 895 N M Intim 1 (158.77 KiB) Viewed 41 times

A simple log bridge in a remote area consists of two parallel logs with planks across them (see figure). W 895 N/m intim 324 mm -2.5 m i The logs are Douglas fir with an average diameter 324 mm. A truck moves slowly across the bridge, which spans 2.5 m. Assume that the weight of the truck is equally distributed between the two logs. Because the wheelbase of the truck is greater than 2.5 m, only one set of wheels is on the bridge at a time. Thus, the wheel load on one log is equivalent to a concentrated load W acting at any position along the span. In addition, the weight of one log and the planks it supports is equivalent to a uniform load of 895 N/m acting on the log. Determine the maximum permissible wheel load win kN) based upon the following. (a) an allowable bending stress of 7.0 MPa KN (b) an allowable shear stress of 0.75 MPa KN