“Knowledge is such a treasure which cannot be stolen”. IS (): Plain and Reinforced Concrete - Code of. Practice [CED 2: Cement and Concrete]. Designator of Legally Binding Document: IS Title of Legally Binding Document: Plain and Reinforced Concrete - Code of Practice Number. IS Indian Standard. PLAIN AND REINFORCED CONCRETE -. CODE OF PRACTICE. (Fourth Revision). ICS 0 BIS BUREAU.
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ask in comments,. Posted 23rd September by ANNACIVIL IS ( ) - DOWNLOAD (DESIGN OF RC STRUCTURES) FIFTH,SEVENTH SEM. BIS B U R E A U O F I N D I A N S T A N D A R D S. MANAK BHAVAN, 9 IS has since been revised as IS 'Code of practice for plain and. (Page 15, clause ) - Insert the following new clause: ''7 The amount of admixture added to a mix shall be recorded in the production record. Redosing of .
Prior to casting of the The crack patterns when seen in context of detailing of the tested beams, the prefabricated steel reinforcement cages were placed in spans were distinctly different.
The failure mode of the beam the formwork at a bottom clear cover of 25 mm. The beams and with the transversely unreinforced tested span was a combination the control specimens used for strength testing of concrete were of diagonal tension DT and shear tension ST , Figure 6 a. The mixture proportions of the concrete used for along the longitudinal reinforcement together with widening of casting the beam and the control specimens are given in Table 1 the crack near the beam mid-depth.
At incipient failure, penetra- and were the same as those used for casting of the prismatic tion of this crack deep into the compression zone took place specimens used in the flexural performance tests.
The target without crushing of concrete. The inclined crack disrupted cylinder compressive strength of the normal-strength concrete equilibrium to such an extent that the beam failed at the inclined mixtures was 26 MPa and initial slump of the plain and fibrous cracking load and there was practically no reserve strength or concrete mixtures was measured in the range of to mm deformation capacity after inclined cracking.
In shear tension and 40 to mm, respectively. Subsequently, the specimens were air-cured in the laboratory until In contrast to Figure 6 a , the crack patterns in Figure 6 b , c , testing, which was carried out after a nominal interval of 28 days d and e show multiple diagonal cracking when the tested span from the day of casting.
A summary of the beam specimens is was transversely reinforced either with code-specified conven- presented in Table 4, which also includes important experimental tional minimum reinforcement or with steel fibres. Multiple results obtained from the shear tests. To detect the formation of diagonal cracking is indicative of the activation of alternative 5 Magazine of Concrete Research Steel fibres as minimum shear reinforcement in reinforced concrete beams Jain and Singh typical for all beams tested span 2 nos 10 dia.
Detailing of the beam specimens: a detailing of the control beam no shear reinforcement in the tested span ; b minimum shear reinforcement per ACI ; c minimum shear reinforcement per IS ; d detailing of the beams with steel fibrous concrete as minimum shear reinforcement in the tested span 6 Magazine of Concrete Research Steel fibres as minimum shear reinforcement in reinforced concrete beams Jain and Singh failure.
Across the beam specimens, although incipient diagonal tension and shear compression failure manifested themselves more clearly at peak loads, at the end of a typical test all the three modes of shear failure could be observed, especially in the fibrous concrete beams. Figure 7 shows that crack widths in the beam specimens reinforced with steel fibres were significantly smaller than the permissible crack width of 0.
The relationships plotted in Figure 8 for selected specimens have been obtained after pairing the axial displacements of the cross- c LVDT arrangement shown in Figure 3 with the applied load, and are indicative of web deformations in the tested span and shear strengths of the beam specimens..
A closer examination of Figure 8 shows that across all the specimens, the first change in slope of the load—deformation relationships occurs at loads in the range of 80— kN, which was taken as the first inclined cracking load d and was thus more or less independent of the shear reinforcement in the beams. Relatively low shear capacity and a sudden reversal Figure 5. Assembled reinforcement cages for the different of slope of the load—deformation relationship following peak categories of transverse reinforcement detailing: a control beam load is seen in the response of the plain concrete beam in Figure no shear reinforcement in the tested span ; b minimum shear 8, whereas a peak load of more than three times that of the plain reinforcement per the ACI Building Code ACI, ; concrete specimen and a gradual reversal of slope after peak c minimum shear reinforcement per the IS BIS, ; loads may be seen in the specimen detailed with the IS d steel fibres as minimum shear reinforcement BIS, minimum shear reinforcement.
Mechanical properties of the reinforcing steel reinforcement ratios, wherein the shear stress at failure decreases with an increase in the member depth Collins and Kuchma, ; Kani, ; Lubell et al.
In mechanisms of resisting diagonal tension once the tensile resis- shallow beams, crack widths and crack spacings tend to be tance of plain concrete has been exhausted.
For the transversely relatively small such that a large value of the shear stress can be reinforced beams, the crack patterns in Figure 6 b and c show transferred across the crack by aggregate interlock, and slip of impending diagonal tension and shear compression SC failure the inclined crack faces relative to each other is small Wight with the latter being indicated by crushing of the compressed and MacGregor, Although the size effect is relevant in concrete near the load point.
It may be seen in Figure 6 d and the context of absolute values of the measured shear strengths, e that in addition to multiple cracking, the fibrous concrete its influence on the relative strengths of the various beams of beams also showed the widening of at least one prominent this investigation would be insignificant as nominally all the inclined crack, which provided some warning about impending beams were of the same size. Summary of the beam specimens and test results The measured peak loads and normalised peak average shear shear stress values of 0.
Among the fibrous bound value of 1. An example of the variability associated with shear Code ACI, Although fibrous concrete reinforced with behaviour, which may be attributed to size effect, is seen in 0.
Figure 9 also shows that the measured shear 8 Magazine of Concrete Research Steel fibres as minimum shear reinforcement in reinforced concrete beams Jain and Singh a b c d e Figure 6. The use of hooked-end steel fibres at volume Figure 7. Even though the design aid is based on the code, it continues to be used without revision as there have been no major changes to Section 5, on which the design aid is based.
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