Why redistribution of moments

The correctness of this "common-sense knowledge" is examined in the present study. A numerical test is performed on two-span continuous reinforced HSC beams with and without confinement using an experimentally validated nonlinear model. The results show that the effect of confinement on moment redistribution is totally different from that on flexural ductility. The moment redistribution at ultimate limit state is found to be almost independent of the confinement, provided that both the negative and positive plastic hinges have formed at failure.

The numerical findings are consistent with tests performed on prototype HSC beams. Several design codes are evaluated. Click here to choose a searching target image or drag and drop a searching target image. Article Info. Abstract Confinement is known to have important influence on ductility of high-strength concrete HSC members and it may therefore be anticipated that this parameter would also affect notably the moment redistribution in these members.

The section then transfers loads to other sections if the applied loads are further increased. This process continues till the structures have plastic binges at sufficient sections to form a failure mechanism when it actually collapses.

However, significant transfer of loads has occurred before the collapse of the structure. This transfer of loads after the formation of first plastic hinge at section having the highest bending moment till the collapse of the structure is known as redistribution of moments.

By this process, therefore, the structure continues to accommodate higher loads before it collapses. Products By Bayt. Use Our Mobile App. Therefore, there is more room for concrete to behave. For this purpose, the buildings were categorized as low rise and highrise buildings for ease of understanding. According to BS, when the number of stories is four or less, maximum redistribution can be done.

When the building becomes smaller, the lateral forces are less and therefore, less chance of moment distributions. If there are systems to maintain lateral stability, the percentage of redistribution could be increased. Further reading could be done by referring to the article Beam Design to BS