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IS 1343: 2012 of reinforced concrete and prestressed concrete codes, these changes are relevant to prestressed concrete code also. Considering this aspect as also the need for a complete review of the provisions of the Code in light of the latest international developments and the improved practices being followed now, a full scale revision of the. Why IS 1343 in their recent code for Prestressed Design (IS 1343-2012) has removed Table No. 12 which provides details for Unbonded PSC design?
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Cross References:
EN 1936
EN 12371
EN 12372
EN 12407
EN 12440
EN 13373:2003
EN 13755
EN 12670
EN 13161
All current amendments available at time of purchase are included with the purchase of this document.
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DEPARTMENT OF CIVILENGINEERING
Selaiyur, Chennai-73
Branch:CIVIL Semester:VII
Subject Name: PRE-STRESS CONCRETE
Marks: 2
1)Whatis the basic principle of prestressed concrete?
2)Namethe various types of tensioning devices used in prestressed concrete.
3)Distinguishbetween pre-tensioned and post-tensioned members.
4)Listthe various types of losses in prestressed concrete.
5)Whatare the advantages of pre-stressed concrete over the conventional reinforcedconcrete?
Marks: 16
1)Arectangle concrete beam of cross section 30cm deep and 20cm wide, ispre-stressed by means of 10 wires diameter located 75mm from the bottom of the beamand 3 wires of 5mm diameter located 500mm from the top of the beam. Assumingthe pre-stress in the steel as 840 N/mm2 , calculate the stresses atthe extreme fibres of the mid span section when the beam is supporting its ownweight over a span of 6m. If a uniformly distributed load of 6KN/m is imposed,calculate the maximum working stress in concrete. The density of concrete is24KN/m3.
2)Explainin detail the different losses that occur in prestressed concrete members.
Is 1343 Code 2012 Pdf Free Download
3)Aconcrete beam with a cross sectional area of 32X103 mm2and radius of gyration of 72mm is prestressed by a parabolic cable carrying aneffective stress of 1000n/mm2. The span of the beam is 8m. Thecable, composed of 6 wires of 7mm diameter, has an eccentricity of 50mm at thecentre and zero at the support. Neglecting all losses, find the centraldeflection of the beamas follows:
b)Self-weight+ prestress + live load of 2KN/m.
4)Aconcrete beam, 100mm wide and 300mm deep, is pre-stressed by straight wirescarrying an effective force of 150KN at an eccentricity of 50mm. The modulus ofelasticity of steel and concrete are 210 and 35KN/mm2 respectively.Estimate the percentage loss of prestress in steel due to elastic deformationof concrete if the area of steel wires is 188mm2.
UNIT – II
1)Listthe different types of prestressing?
2)Whatare the various methods generally used for the investigation of anchorage zonestress?
4)Whatdo you mean by loss due to elastic shortening?
1)Aconcrete beam with a cross sectional area of 32X103 mm2and radius of gyration of 72mm is pre-stressed by a paradolic cable carrying aneffective stress of 1000N/mm2. The span of the beam is 8m. The cablecomposed of 6 wires of 7mm diameter has an eccentricity of 50mm at the centreand zero at the support. Neglecting all losses, find the central deflection fora load of 2 KN/m. Calculate also the long term deflection assuming a creepcoefficient of 1.8 and a loss ratio of 0.8.
2)Whatare the different types of flexural failure modes observed in prestressedconcrete beams? Explain with sketches.
3)Apretensioned prestressed concrete beam having a rectangular section, 150mm wide and 350mm deep has an effective cover of50mm. If fck = 40N/mm2, fp = 1600N/mm2,and the area of prestressing steel Ap =461mm2, calculatethe ultimate flexural strength of the section using IS:1343 code provisions.
4)Theend block of a post-tensioned prestressed concrete beam, 300mm wide and 300mmdeep, is subjected to a concentric anchorage force 832800M by freyssinetanchorage ofarea 11720mm2. Design and detail the anchoragereinforcement for the end block.
UNIT – III
Marks: 2
Marks: 2
1)Mentionany two losses that occur in prestress concrete.
3)Givetwo application of circular prestressing.
4)Listthe different types of joints used between walls and floor slab of PSC tanks.
1)Acylindrical prestressed concrete water tank of internal diameter 30m isrequired to store water over a depth of 7.5m. The permissible compressivestress in concrete at transfer is 13N/mm2 and the minimumcompressive stress under working pressure is 1N/mm2. The loss ratiois 0.75 wires of 5mm diameter with an initial stress of 1000N/mm2are available for circumferential winding and freyssinet cables made up of 12wires of 8mm diameter stressed to 1200N/mm2 are to be used for verticalprestressing. Design the tank walls assuming the base as fixed. The cubestrength of concrete is 40N/mm2.
2)Apartially prestressed pre-tensioned mast is to be designed to suit thefollowing data:
Free – standing height of the pole above the ground= 10m
The pole is to carry twin-conductor high voltagelines (60cm apart) on a cross tree at 9m above ground level.
Conductor size: effective over all diameter = 10mm
Poles are to be located in Mangalore
28-days cube strength of concrete = 50N/mm2
Modulus of rapture of concrete = 5N/mm2
Ultimate tensile strength =1600N/mm2
Permissible stress in concrete under service loads:
Tensile stress in concrete, ftw = 5N/mm2
3)Writea note on prestressed concrete poles with its advantages.
4)Explainin details with sketches about the design consideration of sleepers.
UNIT – IV
1)Definethe term End block?
2)Giveany two advantages of composite construction.
4)Explainthe effect of creep on deflection of prestress concrete member.
1)Aprecast pre-tensioned beam of rectangular section beam of rectangular sectionhas a breadth of 100mm and depth of 200mm. The beam, with an effective span of5m, is prestressed by tendon with their centroids coinciding with the bottomkern. The initial force in tendons is 150KN. The loss of prestress may beassumed to be 15%. The beam is incorporated in a composite T-beam by casting atop flange of breadth 400mm and thickness 40mm. If the composite beam supportsa live load of 8KN/m2, calculate the resultant stresses developed inprecast and in situ cast concrete assuming the pre-tensioned beams as: (a)unpropped and (b) propped during the casting of the slab. Assuming the samemodulus of elasticity for concrete in precast beam and in situ slab.
2)Thecross-section of a composite beam is of T-section having a pretensioned rib,80mm wide and 240mm deep, and an in situ cast slab, 350mm wide and 80mm thick,the pre-tensioned beam is reinforced with eight wires of 5mm diameter with anultimate tensile strength of 1600N/mm2, locate 60mm from the soffitof beam. The compressive strength of concrete in situ cast and precast elementsis 20 and 40N/mm2 respectively. If adequate reinforcement isprovided to prevent shear failure at the interface, estimate the flexuralstrength of the composite section.
3)Whatare the advantages of using composite construction with prestressed and in situconcrete in structural members.
4)Acomposite beam of rectangular section is made up of a precast prestressedT-beam having a rib, 100mm by 780mm, and a slab, 450mm wide and 200mm thick.The in situ cast concrete has a thickness of 800mm and a wide of 400mm. Theprecast T-beam is reinforced with high tensile wires (fpu = 1600N/mm2)having an area of 800mm2 and locate 100mm from the soffit of thebeam. If the cube strength of concrete in the in situ cast slab and prestressedbeam is 20 and 40N/mm2 respectively, estimate the flexural strengthof the composite section. The compression zone of the composite beam comprisesthe precast and the in situ cast element of which the former is about 25percent and the latter 75 percentage.
UNIT – V
1)Giveany two advantages of prestressed concrete bridges.
2)Sketchthe typical post tensioned bridge deck commonly used in the construction ofbridges.
3)Namethe type of bridge deck use for longer span in bridges. Give reason.
4)Sketchtypical the pre tensioned bridge deck commonly used in the construction ofbridges.
1)Whatare the advantages of prestressed concrete bridges?
2)Writenotes on prestressed concrete bridge decks.
3)Explainin detail pre tensioned prestressed concrete bridges with sketches.
4)Explainin detail post tensioned prestressed concrete bridges with sketches.
5)Writethe various steps involved in design of post tensioned prestressed concreteslab bridge deck.