Am Exams Paper 2011

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Associate-Membership Examination A

Associate-Membership Examination

Thursday 28 April 2011

Structural Engineering Design and Practice

09.30 13.00 and 13.30 17.00 (Discussionbetween individuals is not permitted during lunchperiod). A period o teen minutes is provided orreading the question paper, immediately be ore thecommencement o the examination. Candidates arenot permitted to write in answer sheets, or ondrawing paper or to use a calculator during this time.Candidates must satis y the Examiners in ONEquestion.

Important

The written answer to the question selected and any

A3 drawings must bear the candidates number andthe question number at the bottom o the page. Onlythe answer sheets supplied by the Institution maybe used. The candidates name should not appearanywhere in the script.

Notes to Candidates

1. TO PASS THE EXAMINATION,CANDIDATES MUST SATISFY THEEXAMINERS IN BOTH PARTS OF THEQUESTION ATTEMPTED.

2. Examiners will only mark work written by handduring the examination.

3. A air proportion o marks will be awarded orthe demonstration o an understanding o

undamental engineering concepts, as distinctrom calculation o member orces and sizes.

NOTE: In the calculation part o all questions,establishing orm and size is taken to meancompliance with all relevant design criteria, i.e.bending, shear, defection, etc.

4. In all questions 30 marks are allocated to Section1 and 70 marks to Section 2.

5. The Examiners are looking or sound structuraldesigns. It should also be remembered thataesthetics, economy and unction are importantin any competent engineering scheme.

6. Any assumptions made and the design data andcriteria adopted must be stated.

7. Portable computers or programmable calculatorsmay be used but su cient calculations must besubmitted to substantiate the design, and theseshould be set out as in practice.

8. Good clear drawings and sketches are required;they should show all salient and structural

eatures to suitable scales and shouldincorporate adequate details.

9. Candidates will not be allowed to include anypreviously prepared calculations, notes,sketches, diagrams, computer output or othersimilar material in their answer sheets or A3drawings. Any previously prepared in ormationsubmitted by candidates will be ignored by theexaminers.

10. Strictly no external electronic contact is allowedbetween a candidate and anyone outside theexamination venue. Mobile phones must be

switched o throughout the duration o theexamination.

11. This paper is set in SI Units.

Now read Reminder on page 3.


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2 Associate-Membership Examination


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Associate-Membership Examination 3

Associate-Membership Examination,a reminder from your Examiners

The work you are about to start has many eaturesin common with other examinations which you havetackled success ully but it also has some which areunusual.

As in every examination you must ollow care ully theNOTES FOR CANDIDATES set out or your guidanceon the ront cover o this paper; allocate the availabletime sensibly and set out your work in a logical andclear way.

The unusual requirement o the examination is thatyou demonstrate the validity o the training andexperience that you have acquired in recent years.

The Institution must be satis ed that you are able tobring all the various skills you are expected topossess to the e ective solution o structural designproblems whether or not the problem is presentedin terms that are within your actual experience.

Incorporated Structural Engineers must have theability to design and a acility to communicate theirdesign intentions. Where you are required to describestructural solutions you must show by brie , clear,logical and systematic presentation that youunderstood the general structural engineering

principles involved.

In selecting and developing your design you shouldalso remember the guidance given in theInstitutions report, Aims o Structural Design, and inparticular:(1) the structure must be sa e,(2) a good design has certain typical eatures

simplicity, unity and necessity,(3) the structure must ul l its intended unction.

I you have di culty in deciding the correctinterpretation o a question, pay particular attention topoint 6. notes to candidates, on the ront cover. Theexaminers will take into account your interpretation and the design you base on this i this is clearlystated at the beginning o your answer.


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Question 1. Student Accommodation Block

Clients Requirements

1. A new block o student accommodation situated on an open campus site, comprising student bedrooms,store rooms, study/dining room and common areas. See Figure Q1.

2. There is to be 30 bedrooms and 2 stores rooms at each foor level. Each bedroom and store room is to havean overall plan area o 6.0m long by 4.0m wide. A 2.0m wide corridor is required or access.

3. No columns are permitted within any bedroom, the study/dining room or the common areas.

4. The overall height o the building is not to exceed 16.0m and each foor is to have a clear foor to ceiling heighto 2.6m. A 150mm raised foor void is required or services.

5. The external cladding to the building is to be o cavity wall construction comprising 102mm brickwork, 100mmblockwork and 60mm insulation.

6. The roo construction is to be o plain clay tiles on battens with insulation supported by timber ra ters.

Imposed Loading

7. Roo 1.0kN/mFloors 3.0kN/mImposed loading includes allowances or nishes, services and partitions.

Site Conditions

8. The site is level and located on the outskirts o a town.9. Basic wind speed 46m/s based on a 3 second gust; the equivalent mean hourly wind speed is 23m/s.10. Ground conditions:

Ground 1.0m Top soil and ll1.0m 3.0m Alluvial deposits, C = 10kN/m 2

3.0m 8.0m Sand and gravel, N = 15Below 8.0m Firm to sti clay, C = 200kN/m 2

Ground water was encountered 4.0m below ground level.

Omit From Consideration

11. Detailed design o the stair and li t sha ts, although their contribution (i any) to the overall stability and loadtrans er must be stated in Section 1(a).

SECTION 1 (30 marks)

a. Prepare a design appraisal with appropriate sketches indicating a viable structural solution or the proposedscheme. Indicate clearly the unctional raming, load trans er and stability aspects o the scheme. Justi y thereasons or your solution. (20 marks)

b. The client proposes, a ter completion o the construction, and be ore occupation, that the two recessed

areas are in lled to create more accommodation and a rectangular building. Explain the e ect this will haveon the construction and the original design. (10 marks)

SECTION 2 (70 marks)For the solution recommended in Section 1(a):

c. Prepare su cient design calculations to establish the orm and size o all principal structural elementsincluding the oundations. (30 marks)

d. Prepare general arrangement plans, sections and elevations to show the dimensions, layout and dispositiono the structural elements or estimating purposes. Prepare clearly annotated sketches to illustrate details o :(i) The roo and external wall at eaves level.(ii) A perimeter column at ground foor level. (30 marks)

e. Prepare a detailed method statement or the sa e construction o the building. (10 marks)


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Question 2. Sculpture Platform and Visitor Centre


1. A visitor centre is required or the 2012 London Olympic games. It must also support a monumental sculptureThe Turbine Blades. See gure Q2.

2. The visitor centre is to be an equal sided pentagon in plan. Its roo must be designed to support the sculpturewhich is placed centrally. The sculpture will include an integral rigid plinth which imposes a vertical load, a lateralwind orce and an overturning moment to the roo structure. To keep the visitor centre as open as possibleonly one internal column is allowed and this must t inside a 500mm internal diameter circular casing.

3. Clear headroom o 4.0m and a services zone o 0.5m are required. The bottom o the sculpture base plinth isrequired to be no more than 7.5m above ground so that the sculpture does not extend beyond a 40m height limit.

Imposed Loading

4. Roo , other than sculpture 1.5kN/mLoads rom sculpture Vertical load 400kN

Lateral wind orce (in any direction) 240kNOverturning moment (in any direction) 3600kNm

Floor 10.0kN/mThe roo and foor loadings include allowances or nishes and services.

Site Conditions

5. The site or the visitor centre is level and open. A canal runs within 30m o the proposed building. The completed sculpture will be placed horizontally on a barge and transported to the site along this canal.

6. Basic wind speed 40m/s based on a 3 second gust; the equivalent mean hourly wind speed is 20m/s.

7. Ground conditions:Ground level 2.0m Topsoil2.0m 12.0m Medium clay, C = 75kN/m 2

12.0m 35.0m Sti clay, C = 175kN/m 2

The highest recorded ground water level is 1m below ground level.


8. Design o the sculpture and its integral rigid plinth.



b. During site ormation works the remains o a mosaic foor o a Roman villa are ound in the centre o the

proposed building. The remains are 5m in diameter. The client asks what the implication or the roo structurewould be i it is decided to preserve and display the mosaic. Describe how this could be achieved, usingsketches to illustrate your solution. (10 marks)


For the solution recommended in Section 1(a):c. Prepare su cient design calculations to establish the orm and size o all principal structural elements including

the oundations. (30 marks)

d. Prepare general arrangement plans, sections and elevations to show the dimensions, layout and disposition o the structural elements or estimating purposes. Prepare clearly annotated sketches to illustrate details o :(i) The central connection o the roo members under the sculpture plinth.(ii) A typical perimeter oundation, ground foor and column connection at ground foor level. (30 marks)

e. Prepare a detailed method statement or the sa e erection o the sculpture onto the roo . (10 marks)


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Question 3. Watertight Tanks


1. A pair or watertight tanks. See Figure Q3.

2. The tanks are to be constructed in rein orced concrete.3. The tanks are part o a drainage system. Water fows along a channel into the selected tank and out again

at the ar end. One or other o the tanks is selected using a pair o gates.

4. For maintenance purposes, one tank may be completely emptied while the other tank remains ull.

5. A large paved area surrounds the inlet channel and tanks to provide access or maintenance plant and equipment.

Imposed Loading

6. Paved area 10.0kN/m

Site Conditions

7. The site is a level and open area.

8. Ground conditions:Ground level 1.6m Granular llBelow 1.6m Horizontally bedded limestoneNo groundwater was encountered.



b. A ter completion o the design the client raises concerns about the sa ety o operation and maintenance activitiesadjacent to the open tanks. Explain how the tanks can be sa ely operated and maintained. (10 marks)


c. Prepare su cient design calculations to establish the orm and size o all principal structural elements includingthe oundations. (30 marks)

d. Prepare general arrangement plans, sections and elevations to show the dimensions, layout and dispositiono the structural elements or estimating purposes. Prepare clearly annotated sketches to illustrate details o :(i) Construction joints in the tanks.(ii) The gates and their guiding rame. (30 marks)

e. Prepare a detailed method statement or the sa e construction o the tanks. (10 marks)


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Question 4. Viewing Tower


1. A viewing tower is required to overlook an exposed coastal site. The tower is to have an observation arealocated at a height o 12m, accessed by a spiral staircase. See gure Q4.

2. A roo is required over the observation area.

3. The sides o the observation area are to be constructed with the minimum o obstructions.

4. The staircase is to be provided with a weatherproo envelope to protect users.

Imposed Loading

5. Roo 0.75kN/mObservation area foor 5.0kN/m

Site Conditions

6. The site is level and open.7. Basic wind speed 44m/s based on a 3 second gust; the equivalent mean hourly wind speed is 22m/s.8. Ground conditions:

Ground level 3.0m Loose sand, N = 5Below 3.0m Chalk, allowable bearing pressure 100kN/mNo groundwater was encountered.


9. Local design o the spiral staircase.



b. Upon completion o the design the client asks whether the tower can be increased in height to 15m to theobservation area. Describe the implications this will have on the original design. (10 marks)


c. Prepare su cient design calculations to establish the orm and size o all principal structural elements includingthe oundations. (30 marks)

d. Prepare general arrangement plans, sections and elevations to show the dimensions, layout and disposition o the structural elements or estimating purposes. Prepare clearly annotated sketches to illustrate details o :(i) The ormation o the opening in the foor o the observation area.(ii) The connection o the barrier with the supporting structure. (30 marks)

e. Prepare a detailed method statement or the sa e construction o the tower. (10 marks)


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The Institution o Structural EngineersInternational HQ11 Upper Belgrave StreetLondon SW1X 8BHUnited Kingdomtel: +44 (0)20 7235 4535

ax: +44 (0)20 7235 [email protected] Charity

Am Exams Paper 2011

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