Question

"Annexure B" ASSIGNMENT 2 DESIGN BRIEF Due to increasing pedestrian traffic of students travelling from halls of residence to the engineering block at one of its devised a plan, which includes a new means of crossing a busy road safely and without causing traffic delay. A solution to protect student safety for crossing the busy road is to design and build a pedestrian bridge. This will eliminate traffic congestion and delays as well as eliminate conflict between pedestrians and motorists. The main purpose is to safely merge the halls of residence and the engineering block with the implementation of a pedestrian bridge. With such projects it is always necessary to obtain permission, any permits that may be required from the city planning department as well as carry out a site survey. Some of the design information is given in the Table 1 below Table 1: Design Information University of South Africa (UNISA) has many campuses, the Engineer responsible: wISA Student Building Regulation Authority Relevant Building Regulations and Client Architecture Whesa Asseute 1 Natimal Builaine Regulations. Ast No, 103 of 1997 tDesign Codes 2. SA sistone. The chsetu 'at use of concrete . Tant t 5 2 S, SANSİOteo-Basis of structural design and actions for euildings a inustrial structures, Part t.2. 5 s pedestrian bridg .5 hour for all elements Intended use of structure Fire resistance requirements Ganeral loading condions Wind loading conditions Fandamental basic wind speed revain categpry Seveit Exposure conditions Subsoil conditions Atlowabie bearing pressure - 200 kN/M Foundation type enete grade so with 19 m max aggrtgate charateisic srtngth main steel, f 450 N num haradteristie strtngth linkes steel,fe 250 N/m Material data Other relevant information All dinensions shtvs on drawings art in millimetvts (ww) RCD3602/101/0/2019 aure 1 shows a section through the proposed reinforced concrete pedestrian bridge. I will be ndinuous over two spans of 8 m and 12 m respectively and supported on 500 x 300 mm Grade 30/19 concrete will be used and the cover to all steel must be a minimum of 50 All finishes will be off-shutter' and the top surface of the bridge deck will be finist layer of asphalt between the masonry parapets. The para pets will be constructed using day face-bricks to form a solid 220 mm thick wall. Manufacture of the masonry units does not comply with the necessary requirements, but the necessary construction control will be exercised. Carry out structural design of the pedestrian crossing by answering the questions below Any other information not given here should be reasonably assumed and clearly stated. 220 mm masonry parapet 50 mm asphalt 600 250, 300 250 600 Figure 1: Section of pedestrian bridge Explain why it is necessary to obtain permission and any permits that may be required from the city planning department and carry out a site survey. (10 Markks) 1 vertical clearance between the bottom of the bridge and the road is 4700 mm. Propose (do not design) an access ramp (stair-case) on to the bridge deck by providing a neat sketch (section and elevation) to show the access ramp 2 In order to reduce the risk of vehicle collisions with the superstructure of the bridge the 23 3 Calculate the nominal dead and live load of the bridge deck (4 Morks 4 Design the bridge deck by 0) Drawing the shear force and bending moment envelopes considering all combinations of load at the ultimate limit state. Use the method of moment distribution in your analysis. (15 Mariks) () Calculating suitable reinforcement to resist the maximum positive moment. Consider curtailment of reinforcement where appropriate to Marks) (ii) Calculating suitable reinforcement to resist the maximum negative moment over the interior support. e Mares) (v) Checking the deflection of the 12 m span using the allowable span/ratio(s Mares) (v) Design suitable transverse reinforcement to resist the ultimate bending moment in the flange (5 MarRs) 5 Design the internal column and check all code requirements. Use sub-frame analysis in calculating axial loading and moments in the columns. (45 Markes) 6 Design the foundation, reinforced concrete pad footing, based on internal column loading to Marks) and check all code requirements. 7 Provide neat sketches (section and elevation) including reinforcement to illustrate your (10 Mares) design. 8 Neatness and layout of report, method and accuracy of calculations (5 Marks) NB. Your final report for submission shall adhere to the contents of a technical report, see annexure A. 100 marks "Annexure B" ASSIGNMENT 2 DESIGN BRIEF Due to increasing pedestrian traffic of students travelling from halls of re engineering block at one of its many campuses, the University of South Africa devised a plan, which includes a new means of crossing a busy traffic delay. A solution to protect student safety for crossing the busy road is to design and build a pedestrian bridge. This will eliminate traffic congestion and delays as well as eliminate conflict between pedestrians and motorists. The main purpose is to safely merge the halls of residence and the engineering block with the implementation of a pedestrian bridge. With such projects it is always necessary to obtain permission, any permits that may be required from the city planning department as well as carry out a site survey. Some of the design information is given in the Table 1 below. Table 1: Design Information Client Architecture Wekesa S Associates sidence to the (UNISA) has road safely and without causing Engineer responsible: WNISA Student Building Regulation Authority Relevant Building Regulations and Design Codes t. National Building Regulations, Act No. 103叶1977 2. SANS1cso0-The structural use of conerete Part 1 52 3. SANS10160-Basis of structural design and actions for cuildings and industrial srvictures, Part 1.2, s peslestrian briddge t-5 hour for all elements Intended use of structure Fire resistance requirements General loading conditions Wind loading conditions c wind speed Tervain category Exposure conditions Subsoil conditions Allewable bearing pressure E.C feotinas to columns Conarete grode 30 with 19 max max, aggregate character(Sele strength-main steel , f. = 450 시 wun Ckaracteristic strength-lnies steel. f250 Self welght of cendert Foundation type Material data Other relevant information

Answer 1

0.0-F 6.30-6.12. 0.53 1-0.58二.0.42