Problems of steel pipe concrete structure

With excellent seismic performance is an important feature CFT for reasonable and safe to promote this type of structure in the earthquake zone, must be studied in depth the dynamic performance. However, recently studied abroad basically only ten experimental study on the dynamic performance of concrete pipe, still does not provide design formulas for calculation of the theoretical and specifications used; while relatively little research on steel concrete creep and fatigue properties, mainly in Experimental study mainly due to lack of reasonable design training methods, to a certain extent, restricted the steel concrete in high-rise buildings and railway bridges and other projects.

As a new steel concrete structure, China has not yet formulated the relevant steel and concrete structural fire design side provisions, so restrict the application of such structures. The structure has been built on, whether it is outsourced to concrete or coated with fire-resistant coating to ensure the safety and structural fire protection requirements are biased ten conservative and wasteful, the lack of scientific and unity. Therefore, on the basis of theoretical research and engineering practice, should be worked out for our country's steel concrete structure fire code as soon as possible.

N-point steel beams of concrete structures has been a focus of engineering applications and research. Although the design rules and many researchers recently made a number of nodes in the form, but it should be incorporated into the design rules as soon as possible, to provide a foundation for the promotion and application of steel pipe concrete structure. In addition, the dynamic performance of the node structure set up training as a key, relatively few studies of construction difficulties static properties.

Since most ordinary steel concrete structure is characterized by high Bian to a few anti-bearing capacity and good ductility, toughness, and can only be used as a pillar, not used as flexural members, it is of limited use. From the research literature at home and abroad to see prestressed steel concrete composite spatial structure and the advantages of prestressed concrete steel combination of technology, generally used only as a building pillars and arches of the bridge, not applied to the space frame or net title medium-sized racks space structure or member. If its in-depth study to ascertain the force deformation characteristics and failure mechanism of prestressed concrete steel structure, the establishment of computing theory and design methods, you can expand the applications of this new type of composite structure.