CIV 4506 - Concrete Structures Analysis and Design of Beam

Assignment Task

Aim

The aim of this assignment is to allow you to demonstrate your ability to apply the theory developed in Topics 1 to 6, and particularly the design of reinforced concrete beams following the provisions in AS3600-2018.

A 2-storey commercial building is to be constructed in a non-industrial area and in location listed in Parameter Cains X A concrete compressive strength, f’. specified in Parameter Band where standard formwork and compaction are to be used. The general lay-out of the building and the beam is shown in Figure 1a. In addition to its self-weight, the beam is subject to uniform superimposed dead and live loads on the slab strip given in Parameter. The 2-span continuous beams are supported by 400 mm x 400 mm columns as . The spans of the beam have lengths of LZ; and L2, respectively (ParameterD) which are measured from centre to-centre of columns. A 150 mm thick slab is cast monolithically with stiff beams which are spaced LZ; from centre-to-centre of beams (Parameter,E) as shown in Figure 1c. You are asked to design the exterior beam (refer to Figure 1c shaded area). The density of reinforced concrete can be taken as

(i) Determine the minimum beam dimensions (6 and D in the nearest 25 mm) that can safely carry its self-weight, and the superimposed dead and live load as well as can comply with the strength and serviceability requirements. Also, determine the minimum required concrete cover to satisfy the Ww durability requirements and fire resistance period of 90 minutes. Note that you will need to assume starting dimensions first to allow you to calculate the design loads and the initial bending moment and shear forces to design the beam in (ii). This may not be your final dimensions and will likely change as your design progresses. Report your final dimensions of the beam that comply requirements (iii) to (vi)."

(ii) Determine the design bending moments and transverse shear forces using the simplified method in at AS3600 (verify and show that the simplified method can be applied for this beam). Draw the bendingmoment and shear diagram complete with units.

(iii) Design the necessary flexural reinforcement required for positive and negative bending along the length of the beam. Ensure that the minimum strength requirements are satisfied.

(iv) Design the necessary shear reinforcement along the length of the beam.

(v) Draw the reinforcement detailing of the beam (including both flexure and shear), with appropriate sections.

(vi) Determine the total long-term deflection and the incremental deflection of the beam in the end and interior spans. You may assume yy, = 0.7 and yi = 0.4. Check whether these deflections are within the limit specified in AS3600. If they are not within the limits, suggest on ways on how this design requirement can be satisfied.

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