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The optimization of the design strength characteristics of the frame of the tractor

Babushkin A. E., Kosov O., Shekhovtsov V., Lyashenko M.

Journal of KONES

2011

Vol. 18, No. 1

10-14

At present there are a many constructions of the carrier systems of motor transport means, bodies with the systems of communications in the form of rigid triangles executed in the form. This makes it possible to assume that the technical solution has high efficiency and correctly it can be examined in application to the tractors. An increase in the hardness, strength and longevity of frame due to an increase in the dimensions of the profile used or improvement of technology and design of the welded connections, which decrease the stress concentration in the region of the welds, can prove to be not the most rational solution from the point of view of labor expense and material consumption. More preferable in this respect the frame, made in the form of three-dimensional truss in lower part of which is fastened running apparatus, and inside are located engine, transmission, panels of skin of cowling and cab, control station. But since farm in “pure” form because of the impossibility to have struts on the front is hardly possible, although the inclined cross connection in the aperture of front glass of cab and does not contradict the requirements of field of view, has sense to speak about skeleton type frame, where only the sidewalls and the top of body to a greater or lesser extent answer the classical determination of farm.

Wzmocnienie kompozytami ustroju nośnego wielopoziomowego parkingu w porcie lotniczym im. F. Chopina w Warszawie

Łagoda G., Łagoda M.

Archiwum Instytutu Inżynierii Lądowej

2011

Nr 10

169-174

To increase the load bearing capacity of steel and concrete bridges, external prestressing can also be applied. In the paper an example of such strengthening of a bridge span is described. The span consists of prestressed precast WBS type girders and three cross-beams, also prestressed. The spans were erected by longitudinal and transversal launching method. Complex construction technology enabled to use minimal (record) quantities of constructional materials. In the paper the attention is paid to the fact that in the calculations of load bearing capacity of rehabilitated bridges, their construction technology must be taken into account. This is particularly important in the case of verifying calculations of prestressed bridges, especially those consisting of prefabricated elements.