Reg. No.

:

Question Paper Code : 55251 B.E./B.Tech. DEGREE EXAMINATION, NOVEMBER/DE Seventh Semester

Civil Engineering

CE2401 _

l'.': "t DESIGN OF RE]NFORCED CONCRETE AND BRICK MASONRY STRUCTURES '

'

(Regulatior 2008)

Time : Three hours

Maximum : l0O marks Use ofIS 456 and sB."1Q

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cii\tion$.

PARTA-(m.2.E0marks)

2. 3. 4. 5. 6. 7. 8. 9.

Wlat are the BDes of retaining walls? What are the stability checks in dase o*ehjning

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waJJ?

How will you classi[, the water hnks?

List the conditions to be cllrsidered while designing a undergrcund tank. What are the different tj.pes oistairs? What are the limitations of direct design method for flat slab? What are the assumptions made in yield line analysis of slabs? What artg!rc g,haraotgristic features of yield lines? HowrLhebriq! md€gnry:walls are classfied?

10.

How will you d-etefiDine the permissible srress in masonry?

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PART B

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(s x 16 = 80 marks)

(a) DS3iglte (al Da3igrr\@ stem of a cantilever retaining rer,inihs wall u to retain an ear.then ; 9:. embailment with a horizortal top 3.S mibove ground f*ef. O.osity ,eg$t is 18 kN/m3. Aagle oi internal fricion is SO;. SBC or 1 ..,'of soil;200 kN/mr.

11ir ::

The coefficient of friction bet$reeir soil arrd concrete is 0.5. Adopt M20 concrcte and Fe415 steel. Or

(b)

12. {a)

13.

Design a counterfon reraining wa[, if the height of rhe wall is 5.5m aoove ground jevel. SBC of soit is I E0 kN/mr. Angle of friclion is 30. Unir weiBhr of bacl.:filt js t8kN/mj. Xe.p ipa.ingif cou,li;;;;;3 m. (oellrcteni oI fricfion between soil and concr;te = O.S. AdoDi M2o concrete and Fe4lS steel. Check the stability and desjgn *. it"_ of the reLaining wall.

Design an underground warer Lank of size 3m follov/ing data. Type of soil : Submerged sandy soil Unit weight of soil : 16 kN/m3 Angle of friction : 30" Water table can raise upto Ground level Adopt M25 concrere ard Fe4l S steel Design the side walis of lhe rank

x

8rrx x 3m for tLe,

(b)

a flat bottom circular water tank of diameter 1Om heighl 4m which is ro be supporled by ring beal'r .f 7.S* and total ;;;i.; rne nn8 beam is to be supported by 6Lx columns equally spaced. M25 concrele a',d Fe4lS steel. qeiign ,h. r"il.",iris ;;_;.;;;;":;;Use Top dome (ii) Top ring beam (iij) CyLiniricalwJr.

(a)

Design a dog legged srairs for an oflice building in a room measuring : s.Bm clear. Vertical alisrance berween ihe floors is 3.6m width of flishr is ro be r.2s rn. ruroty ii*-ioui or concrete and Fe4l5 steel. Assune the mm walls at the eid ofouter 6dg;s of landing "tdr"slab.

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2.Bm

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Or

14.

-, (b) I square slab of size 6 m x 6 m is reinforced srith 10 mrn diametcr at. a spacins or 18o mm r" t.ir. ari.ri.""_ ^il. ., avenge Y-t!: *.l.bais effective deplh may be ia_ken as : zo __ ,rJ.*.uu l"rif, "l I-so mm. D.€rermjne thi permissible

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supporred all around. Adopt M20 concrete.

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15. (a)

A brick masonry wall of a s buildinS is 20 cm thick and rs supported ty to it tr.,t"l"g:l?om slal' at iL top and botlom The carries a venicat r"ri "- i""i,li.It wall

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", cross walls, The .1. oetween

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f,? TJi" :i H i: ff ?,:;ltl, storev""lis ""

3 m Derermine tr,. ..q,;.J1,.i"r,";"I':,;:i1]"*.'ol.Lhe lglh ol brjck and rype of mortar ro be used. Or

1b; exphin iG

(i) (i.i)

roUowing terms

:

Effective tength of brick masonry wall Effecrive heighr oI brick masonry

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{iii} Permissible sLresses for brick masonry [iv) l,ateral support to a vrall.

a :..

55251