By ACI Committee 314
Summary: (For structures of constrained dimension and peak, in line with ACI 318-11 and IPS-1, "Essential specifications for bolstered Concrete Buildings"
This consultant offers simplified equipment and layout innovations that facilitate and pace the engineering of low-rise constructions inside convinced obstacles. fabric is gifted in an order that follows general layout technique with systems brought because the clothier will want them during a construction layout.
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Extra info for 314R-11 Guide to Simplified Design for Reinforced Concrete Builidings
Their absolute values as time vectors, but also their phase relation. Then the value of the receptance F must be also regarded as a time vector. From the dynamic point of view not only the elastic properties of the parts of the struc ture but also their masses are significant. The structure of the machine tool must be consi dered as a vibratory system of springs and masses. For practical purposes it will be suffici ent to consider the structure of a machine as a system with a limited number of degrees of freedom.
Nevertheless, if the stiffness of the tailstock centre could be made not very different from that of the spindle, the effect would be negligible. In Fig. 12(b) is shown the case of a surface grinder. During the cross movement of the slide with the upright carrying the grinding headstock the bed and the foundation deform so that varying relative displacement occurs between the grinding wheel and the workpiece, disturbing the planeness of the ground surface along the cross section of the workpiece.
The columns in dicating the magnitude of the W errors are divided into three parts expressing in each the contribution of the table and slide, of the bed and of the column respectively. It may be seen that the design B gives considerably smaller deformations of the group "table and slide" and also to decrease in the deformations of the bed as compared with design A. The weight of machine A was 25,000 lb, of machine B 37,400 lb. 50 MACHINE TOOL STRUCTURES