Overview of Heavy Prestressed Bumpy Ridge Joining Structure with Steel Wire Wound

Abstract

Heavy overall structure developing into heavy bolts prestressed sectional structure, further into heavy winding wire prestressed bumpy ridge joining structure, is a development result of science, technology, engineering. Prestress technology is a key factor to promote this development. The advantages and disadvantages of these types of structures and their application backgrounds are analyzed theoretically from the point of view such as the allowable stress of pretightening pieces, stress fluctuations ratio of pretightened pieces, pretightening coefficient, pretightening stiffness, residual pretightening stress, fatigue resistance, technical and economic target. Principle shortcomings of the heavy bolts prestressed sectional structure are pointed out emphatically. Owing to the limit of lower allowable stress of pretightening pieces, it is difficult to obtain high mechanical indicators in the application of heavy and super heavy structures; furthermore,pretightening pieces not only need to occupy a big space but also cannot offer the normal stress protection to pretightened pieces. Comparatively, a detailed study of the mechanical characteristics and advantages of heavy winding wire prestressed bumpy ridge joining structure is made,which can provide high reliability pretightening force besides the residual compressive stress of pretightened pieces remaining on the ratio of pre-stress up to 50%. All these are favorable to prevent the shearing offset of pieces. The design parameter optimization table is given, which provides a scientific reference for heavy prestress structure design.