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1 STRUCTURAL DESIGN II ASSESSMENT 1 (Design 1) Weighting: 25% (250 marks out of 1000) Due date: 1 April 2022 A B A TYPICAL FLOOR PLAN SECTION Z-Z Fig.1. A typical floor plan and elevation (Sec Z-Z) of the building X X 7000 7000 7000 7000 28000 180 3000 Z Z 3200 3200 X X 3200 2X 300 9600 1800 600 CA C 2 3 4 5 1 B Centreline of the retaining wall naveen mahadeva Stamp 2 In this assignment, you need to demonstrate your understanding of concepts of load path, load estimation, analysis and design of frames, footings and retaining wall, so primarily, learning objectives 1, 3, 4, 6 (modules 1-5). Follow the instructions provided at the end of this assessment for completing this assessment. DESIGN BRIEF The figures above show a typical floor plan and section elevation of a three-storied reinforced concrete office building to be constructed at Toowoomba. Drawing is not to scale. All units are in mm. This is a framed reinforced concrete building monolithically cast with the beams along grids A, B and C supporting the RC floor. There are no beams along grids 2, 3 and 4, beams are running along grids 1 and 5, and along A, B and C. At each floor level, the brick wall is sitting on the beams at that floor level. All the glass windows are of dimensions 3000 mm x 1800 mm x 20 mm, and they are located centrally with respect to the adjacent grid lines. The brick masonry wall is 180 mm thick. Assume that the thickness of the floor slabs and the roof slab are 250 mm and they all have the same beam layout. Slope of the inaccessible roof (except for maintenance) can be ignored and can be considered as flat. The roof has an overhang of 300 mm all around the building as shown in the fig. above. Beams along grids 1 and 5 are of 300 mm width x 550 mm deep and support the brick walls completely and the slab as well. Cross-section dimensions of beams along other grids are shown in Table 1. Note that all the beam depth dimensions are the overall depth including the slab thickness. Furthermore, assume that the columns B1, B5 are of the same size (400 mm x 400 mm), similarly columns B2-B4 are of the same size (refer Table 1). All the columns of A and C grids are of the same size (400 mm x 400 mm). Centrelines of the columns are aligned along with the grid lines. The beams transfer the load to the columns rigidly connected to them at their supports. The ground floor slab is slab-on-ground so the load will be transferred directly to the soil below. The brick walls at the ground floor level have masonry footings, hence their load will not affect the footing design. Because of the space issues and to eliminate the differential settlement, combined footings are to be designed for columns A1, B1, C1, then A2, B2, C2 etc. All the columns are rigidly connected to footings. Because of the difference in elevation between the ground level where the building will be constructed and the adjacent area, a suitable retaining wall is to be designed to accommodate the step change. The retaining wall is parallel to grid 1 and is only on the left side of the building. Centreline of the wall is shown in Fig. 1. The wall will retain soil only on one side, i.e. on the side of the building. Because the wall is close to the building, assume that a part of the building load (20%) is to be carried by the retaining wall. In the absence of exact calculations, assume that the building loads up to Grid 2 will be carried by the retaining wall and this load can be considered as a surcharge load acting on the retaining wall. The height of the wall is the difference between the GL of the building and the GL of the bottom level of the wall, which is provided in Table 1 below. In reality, the calculation is more complicated, things have been simplified for the assignment purpose. If you want to do precise calculation, proceed without any problem. Assume data not supplied, however, explain the reasons of the assumed values. DESIGN PARAMETERS • Concrete characteristic strength, f'c = Y MPa • Yield strength of reinforcing steel, fy = 500 MPa. • Density of reinforced concrete can be taken as ρ = 2400 kg/m3. • Allowable bearing capacity of subsoil qa = 250 kPa, • Subsoil: gravelly clay with properties c=5 kPa, ?? = 30?? , ?? = 19kN/m3. • Glass windows are of unit weight, ρ = 2600 kg/m3. • Exposure classification: A2. 3 • Take appropriate values of X and Y and other values as appropriate from Table 1 depending on the last two digits of your Student ID number. Assume appropriate realistic values for other design data that are not provided. • Assume that a shear wall (not shown in fig.) would carry the lateral wind loading. Ignore this for preliminary design. • All design and detailing should be in accordance with AS 3600 2018 and loading should be in accordance with AS 1170.0, AS1170.1. • Ignore secondary effects. Table 1: Design Data PROBLEM STATEMENT Q1. Load estimation (60 marks) a) Estimate the loads acting on the building frame. Carry out frame analyses with appropriate loading combinations using Strand7. 2D model is sufficient, 3D model is not required. From the Strand7 analysis, determine the following: axial loads and bending moments acting on the columns i) A1 and ii) B1 at the footing level. Show the relevant axial force and bending moment diagrams of the frame with clear labels. Q2. Footing design and detailing (90 marks) a) Design a combined footing (dimensions L, W and D) for columns A1, B1 and C1 for strength and serviceability requirements. Ensure that the soil pressure distribution below the footing is uniform. Assume that clear cover at the bottom is 75 mm and cover all around is 50 mm. (45 marks) Student ID number (last two digits) X (mm) Y (MPa) Beam sizes (width x depth along grids A & C) (mm) Beam size (width x depth along grid B) (mm) B2 column size (mm) Height of the retaining wall (mm) 01/21/41/61/81 7000 20 300 x 450 300 x 500 500 x 500 5000 02/22/42/62/82 7000 25 300 x 450 300 x 500 500 x 500 5000 03/23/43/63/83 7000 32 300 x 450 300 x 500 500 x 500 5000 04/24/44/64/84 7000 40 300 x 450 300 x 500 500 x 500 5000 05/25/45/65/85 6500 20 300 x 400 300 x 500 500 x 500 5000 06/26/46/66/86 6500 25 300 x 400 300 x 500 500 x 500 6000 07/27/47/67/87 6500 32 300 x 400 300 x 500 500 x 500 6000 08/28/48/68/88 6500 40 300 x 400 300 x 500 500 x 500 4000 09/29/49/69/89 6000 20 300 x 350 300 x 450 450 x 450 4000 10/30/50/70/90 6000 25 300 x 350 300 x 450 450 x 450 4000 11/31/51/71/91 6000 32 300 x 350 300 x 450 450 x 450 4000 12/32/52/72/92 6000 40 300 x 350 300 x 450 450 x 450 6000 13/33/53/73/93 5000 20 300 x 300 300 x 400 450 x 450 6000 14/34/54/74/94 5000 25 300 x 300 300 x 400 450 x 450 8000 15/35/55/75/95 5000 32 300 x 300 300 x 400 450 x 450 8000 16/36/56/76/96 5000 40 300 x 300 300 x 400 450 x 450 8000 17/37/57/77/97 4000 20 300 x 250 300 x 350 400 x 400 7500 18/38/58/78/98 4000 25 300 x 250 300 x 350 400 x 400 7500 19/39/59/79/99 4000 32 300 x 250 300 x 350 400 x 400 7500 20/40/60/80/00 4000 40 300 x 250 300 x 350 400 x 400 7500 4 b) Design the reinforcement required and draw the reinforcement detailing clearly showing at least 2 views. (45 marks) Q3. Retaining wall design (100 marks) a) Calculate all the loads acting on the RC cantilever retaining wall for the height given in Table 1. The backfilled soil (with zero slope) is crushed gravel deposit with the properties: c=0 kPa, ?? = 30??, ?? = 18kN/m3. Neglect the effect of wind and seismic load (if any). Assume clear cover at the bottom of the base is 75 mm and cover all around is 50 mm. Draw a sketch of the wall showing the forces acting on it. (25 marks) b) Design the retaining wall for serviceability and stability requirements. (40 marks) c) Design the reinforcement required for the wall only considering both bending and shear. Draw the reinforcement detailing of the wall. (25 marks) d) Describe how you can provide an economic design of the retaining wall. (10 marks) Note the following: The assignment would contain one set of safe design for all structural elements showing all the necessary steps and all your trial designs should go in the Appendix in proper sequence. Marks will be given for systematic design with comments. If you are using worksheet (Excel type) for iterative design calculations, once your design is