Tài liệu The Design of Prestressed Concrete Bridges ppt

... cracking of the concrete, either due to the aggressiveness of the environment or the sensitivity of the structure. Class 1 and Class 2 (see 4.2.4) prestressed concrete structures are designed at the ... walls at the ends of the excavation. 3.12.3 Bridge deck slabs A further example of the practical importance of arching action is the design of the...

Ngày tải lên: 18/02/2014, 18:20

... assumed that the production rate (r ijt ) of the main product j of each such scheme is proportional to the capacity of the plant. where M i denotes the index set of main products of the alternative ... chop off the solution point from the space of the LP relaxation polyhedron. The process is repeated, thereby reducing the gap between the MILP and its LP re...

Ngày tải lên: 19/01/2014, 18:20

... Typically, the designer designs a product with minimal knowledge about the capabilities and limitations of the manufacturing technology. The designer then tries to find out if the design can be ... that the designer can easily interact with the system. Ranking of Redesign Alternatives Another area requiring research attention in the context of generation of redes...

Ngày tải lên: 25/01/2014, 13:20

... accuracy of the workpiece mainly depend on the axial rigidity of the spindle headstock and of the rotary table. Therefore, the rigidity of the thrust bear- ings is especially important. To increase the ... conditions as the expansion of the rotating parts due to the effects of heat and centrifugal force do not cause jamming of the outer rings in the housi...

Ngày tải lên: 25/12/2013, 05:17

... clearance Due to the tight fits, the inner ring of the bearing is expanded and the outer ring with the roller-and-cage assembly is contracted. Thus the radial clearance of the bearing is reduced ... V1. Bearing selection The selection of the bearings is primarily based on the main thrust, which is directed downwards. It is made up of the weight of the rotor...

Ngày tải lên: 25/12/2013, 05:17

... Typically, the designer designs a product with minimal knowledge about the capabilities and limitations of the manufacturing technology. The designer then tries to find out if the design can be ... that the designer can easily interact with the system. Ranking of Redesign Alternatives Another area requiring research attention in the context of generation of redes...

Ngày tải lên: 19/01/2014, 18:20

... selection The axial load of 130 kN is made up of the weight of the rotor and the two variable top and bottom fan im- pellers as well as the thrust of these fan impellers. They are supported by the ... V1. Bearing selection The selection of the bearings is primarily based on the main thrust, which is directed downwards. It is made up of the weight of the rot...

Ngày tải lên: 23/01/2014, 04:20

... bearing aspects of the applications. The operation of the machine allows conclusions to be drawn about the operating conditions which dictate the bearing type and design, the size and arrangement, ... roughening of the surfaces (increased running noise). Bearing dimensioning The size of the bearings is dictated by the shaft diame- ter, which in turn is based on t...

Ngày tải lên: 23/01/2014, 04:20

... assumed that the production rate (r ijt ) of the main product j of each such scheme is proportional to the capacity of the plant. where M i denotes the index set of main products of the alternative ... chop off the solution point from the space of the LP relaxation polyhedron. The process is repeated, thereby reducing the gap between the MILP and its LP re...

Ngày tải lên: 25/01/2014, 13:20