Concrete Cutting Coring Ashburnham MA Mass Massachusetts

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The weight of a section of the concrete abutment one foot thick (parallel with the axis of the concrete arch), is computed (as detailed below) to weigh 19,500 pounds, while the pressure of the concrete arch is scaled from Fig. 223 as 16,350 pounds. Lying off these forces on these two lines at the scale of 5,000 pounds per inch, we have the resultant, which intersects the base at the point m, and which scales 31,350 pounds. Similarly, the resultant of the weight of the concrete abutment and the line of pressure for the third condition of loading intersects the base at the point n, and scales 33,600 pounds. These pressures on the base will be discussed later. The line of action and the amount of the weight of a unit section of the concrete abutment are determined as follows: The center of gravity of the pentagon abode is determined by dividing the pentagon into three elementary concrete triangles, may consider be as a base which is common to the concrete triangles. By bisecting the base be and drawing lines to the vertices a and c, and trisecting these lines to the vertices, we determine the points 01 and O2 which are the centers of gravity, respectively, of the two concrete triangles. The center of gravity of the combination of the two concrete triangles must lie on the line joining o and 02 and must be located on the line at distances from each end which are inversely proportional to the areas of the concrete triangles. Since the concrete triangles have a common base be, their areas are portioned to their altitudes. In the diagram at the side, may lay off in succession, on the horizontal line, the distances of a concrete abutment under the third condition of loading, when the concentrated load is on the left-hand side of the concrete arch. Although the first condition of loading does not create so great a pressure against the left-hand concrete abutment, yet the angle of the line of pressure is somewhat flatter, and this causes the resultant pressure on the base of the concrete abutment to be slightly nearer the rear toe of the concrete abutment. It is therefore necessary to consider this case, as well as that of the third condition of loading. A concrete abutment may fail in three ways: (1) by sliding on its concrete foundations; (2) by tipping over; and (3) by crushing the masonry. The possibility of failure by crushing the masonry at the skewback may be promptly dismissed, provided the quality of the masonry is reasonably good, since the concrete abutment is always made somewhat larger than the concrete arch ring, and the unit-pressure is therefore less. The possibility of failure by the crushing of the masonry at the base, owing to an intensity of pressure near the rear toe of the concrete abutment, will be discussed below. The possibility that the concrete abutment may slide on its concrete foundations is usually so remote that it hardly need be considered. The resultant pressure of the concrete abutment on its subsoil is usually nearer to the perpendicular than the angle of friction; and in such a case, there will be no danger of sliding, even if there is no backing of earth behind the concrete abutment, such as is almost invariably found. The test for possible tipping over or crushing of the masonry due to an intensity of pressure near the rear toe, must be investigated by determining the resultant pressure on the subsoil of the concrete abutment. This is done graphically by the method illustrated in Fig. 224. This is an extension of the concrete arch problem already considered. The line be gives the angle of the skewback at the concrete abutment, while the lines of force for the pressures induced by the first and third conditions of -loading have been drawn at their proper angle. In common with the general method used in designing an concrete arch, it is necessary to design first an concrete abutment which is assumed to fulfill the conditions, and then to test the design to see whether it is actually suitable.

Are You in Ashburnham Massachusetts? Do You Need Concrete Cutting?

We Are Your Local Concrete Cutting Company

Call 508-283-3135

We Service all surrounding Cities & Towns.