Problem #1 Light-grade steel channel was used as a purlin of a truss. The top chord of the truss is inclined IV:3 H and distance between trusses is equal to 3 m. The purlin has a weight of 71 N/m and spaced at 1.2 m. on centers. The dead load including the roof materials is 1200 Pa, live load of 1000 Pa and wind load of 1440 Pa. Coefficient of pressure at leeward and windward are 0.6 and 0.2 respectively. Sag rods are placed at the middle thirds and Fbx = Fby = 138 MPa. Sx = 4.48 x 104 mm3 Sy = 1.18 x 104 mm3 %3D %D 1.2 1.2 Using interaction formula, determine the following: O Maximum ratio of actual to allowable bending stress for combination of (D + L) load. ® Maximum ratio of actual to allowable bending stress for combination of 0.75 (D + L + W). ® Maximum ratio of actual to allowable bending stress for combination of (D + L) if one line of sag rod was place at the mid-span.

Problem #1 Light-grade steel channel was used as a purlin of a truss. The top chord of the truss is inclined IV:3 H and distance between trusses is equal to 3 m. The purlin has a weight of 71 N/m and spaced at 1.2 m. on centers. The dead load including the roof materials is 1200 Pa, live load of 1000 Pa and wind load of 1440 Pa. Coefficient of pressure at leeward and windward are 0.6 and 0.2 respectively. Sag rods are placed at the middle thirds and Fbx = Fby = 138 MPa. Sx = 4.48 x 104 mm3 Sy = 1.18 x 104 mm3 %3D %D 1.2 1.2 Using interaction formula, determine the following: O Maximum ratio of actual to allowable bending stress for combination of (D + L) load. ® Maximum ratio of actual to allowable bending stress for combination of 0.75 (D + L + W). ® Maximum ratio of actual to allowable bending stress for combination of (D + L) if one line of sag rod was place at the mid-span.

Steel Design (Activate Learning with these NEW titles from Engineering!)

6th Edition

ISBN:9781337094740

Author:Segui, William T.

Publisher:Segui, William T.

Chapter10: Plate Girders

Section: Chapter Questions

Problem 10.7.9P

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Measuring site work, Excavation and Piling

Bid drawings typically include very little material about the precise requirements of site work operations, measuring site work and excavation work differs from measuring most other works on a construction project. The actual site work conditions are not provided and also the dimensions of the excavations are not known during the pre-construction phase. The precise measurement of the excavation and backfill of the earth material and topsoil is important for a contractor to decide upon the total cost required for the process. All the works should be carried out under OSHA (Occupational Safety and Health Administration) standards to ensure the safety of the workers.

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Problem #1
Light-grade steel channel was used as a purlin of a truss. The top chord
of the truss is inclined I V:3 H and distance between trusses is equal to
3 m. The purlin has a weight of 71 N/m and spaced at 1.2 m. on centers.
The dead load including the roof materials is 1200 Pa, live load of 1000
Pa and wind load of 1440 Pa. Coefficient of pressure at leeward and
windward are 0.6 and 0.2 respectively. Sag rods are placed at the
middle thirds and Fbx = Fby = 138 MPa.
Sx = 4.48 x 104 mm3
Sy = 1.18 x 104 mm3
%3D
%3D
1.2
1.2
Using interaction formula,
determine the following:
O Maximum ratio of actual to
allowable bending stress for
combination of (D + L) load.
® Maximum ratio of actual to allowable bending stress for
combination of 0.75 (D + L + W).
® Maximum ratio of actual to allowable bending stress for
combination of (D + L) if one line of sag rod was place at the
mid-span.

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