Abstract
This paper describes a system of diagonal beam reinforcing for reinforced concrete ductile frame buildings in seismic areas. The development and application of the system is described with reference to the design of an 18 storey building. The proposed reinforcing system has a number of major structural advantages over conventional reinforcing. Moments and shears within the beam span can be resisted entirely by the main reinforcing. Plastic hinge lengths are substantially increased and the hinging is kept away from the column face allowing concrete strut action to be effective in resisting forces within the elastic beam column joint.
Highlights
The principal objective in seismic design of reinforced concrete structures is to provide a system that allows significant amounts of energy to be dissipated in a controlled ductile mechanism
Specific aspects of the design have generally followed the recommendations of the New Zealand National Society for Earthquake Engineering's Discussion Group on Seismic Design of Ductile Moment Resisting Reinforced Concrete Frames [9]
A system of diagonal reinforcing has been proposed for the beams of multistorey reinforced concrete ductile frame buildings for seismic areas
Summary
The principal objective in seismic design of reinforced concrete structures is to provide a system that allows significant amounts of energy to be dissipated in a controlled ductile mechanism. In a conventionally reinforced frame structure under seismic loading, plastic hinges generally occur at the ends of the beams where moments are highest. Secondary reinforcing ensures that hinging occurs only in the main diagonal reinforcing. Major advantages are that plastic hinges are remote from the column face, plastic hinge lengths This diagonal reinforcing system has been developed for the design of a proposed eighteen storey building. The main beam reinforcing crosses diagonally at mid-span between beam stuvs which are heavily reinforced to prevent beam hinging at the column face. The geometry and reinforcing steel areas are such that, under increasing lateral load, yielding occurs first at the end of the stuv at point A on figures 1 and 2. The diagonal reinforcing creates a simple truss which can resist all applied forces as shown in figure 3
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