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This paper (Yang et al. (2011)) has made a significant contribution to the shear strength prediction of reinforced concrete dapped-end beams. The contributors read the paper with great interest. However, some ratios of measured and predicted shear strength in Table 1 and Figure 8 are incorrect. The mean, standard deviation and coefficient of variation of the ratios of measured and predicted shear strength using strut-and-tie model based on ACI 318-05 (ACI, 2005) are corrected as 2·01, 1·45 and 0·72, respectively.

The authors would like to thank the contributors for their valuable comments. As pointed out by the contributors, there are errors in the ratios between test results and predictions using strut-and-tie model based on ACI 318-05 listed in Table 1 and Figure 8 of the original paper. Corrected values are presented here in Table 2 and Figure 12.

ACI (American Concrete Institute)
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ACI Committee 318. Building code requirements for structural concrete (ACI 318-05) and commentary (ACI 318R-05)
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2005
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ACI
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Farmington Hills, Michigan, USA
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Lu
WY
,
Lin
IJ
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Hwang
SJ
,
Lin
YH
.
Shear strength of high-strength concrete dapped-end beams
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680
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Design and behavior of dappedend beams
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1979
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Data & Figures

Figure 12.

Comparison of test results with proposed models: (a) effective shear span-to-nib depth ratio a1/hd: (b) hanger reinforcement index φSH

Figure 12.

Comparison of test results with proposed models: (a) effective shear span-to-nib depth ratio a1/hd: (b) hanger reinforcement index φSH

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Table 2.

Comparison of measured and predicted shear capacities of dapped-end beams

ResearcherSpecimenf'c: MPab: mmh: mmhd: mma0: mma/ha1/hdφSHφsφvφhφNVn: kN(Vn)Exp./(Vn)pre.
Exp.PCISTMMech. anal.PCISTMMech. anal.
Mattock and Chan (1979)1A341276103051140·80·60·0740·0260·0000·0110·00014464941472·251·530·98
 1B311276103051140·80·60·0840·0990·0000·0250·056191911411822·101·351·05
 2A331276103051140·80·60·0510·0400·0000·0230·00017894931791·901·921·00
 2B311276103051140·80·60·0560·0980·0000·0250·04716992951661·841·781·02
 3A371276103051140·80·60·0570·0350·0000·0200·000216941162252·301·860·96
 3B321276103051140·80·60·0690·1020·0000·0250·051177951211881·861·460·94
 4A321276103051141·30·60·0680·0410·0000·0230·000189901421772·101·331·07
 4B291276103051141·30·60·0750·1090·0000·0260·055177921741791·921·020·99
Lu et al. (2003)134200600300800·70·50·1340·0970·0000·0260·0005611574035403·571·391·04
 263200600300800·70·50·0870·0530·0000·0140·0007051764907114·011·440·99
 369200600300800·70·50·0790·0480·0000·0130·0007131804907273·961·460·98
 4342006003001600·90·80·0870·0970·0000·0260·0003601571783802·292·020·95
 5632006003001600·90·80·0580·0530·0000·0140·0005131762455492·912·090·93
 6692006003001600·90·70·0520·0480·0000·0130·0005211802555622·892·040·93
 734200600300800·70·50·1080·0650·0000·0260·0004581574015292·921·140·87
 863200600300800·70·50·0580·0350·0000·0140·0005991763816843·401·570·88
 969200600300800·70·50·0520·0320·0000·0130·0006421803817003·571·690·92
 10342006003001600·90·80·0730·0650·0000·0260·0002911571673201·851·740·91
 11632006003001600·90·80·0400·0350·0000·0140·0003511761613921·992·180·90
 12692006003001600·90·80·0360·0320·0000·0130·0003921801613942·182·430·99
Wang et al. (2005)B1·1111214370170751·30·90·1820·1180·0490·0000·000596185630·970·690·93
 B1·1211214370164751·20·80·0270·1180·0490·0000·000422421461·732·010·91
 B1·21a11220370190751·31·20·3160·1220·0500·0000·000656263791·041·030·83
 B1·2211220370160751·11·00·0780·1220·0500·0000·000736043861·231·700·85
 B2·1113150300150750·80·70·0410·1800·0740·0000·000352413581·422·710·60
 B2·1213150300150750·81·20·0410·1800·0740·0000·00032244441·307·940·72
 B2·2113150300150750·81·00·0830·1800·0740·0000·000554912501·134·601·11
 B2·2213150300150750·81·10·0830·1800·0740·0000·00066498461·358·231·42
 B2·31a13150300150750·80·90·3600·1800·0740·0000·000765542791·391·800·96
 B2·32a13150300150750·81·20·3600·1800·0740·0000·000655535651·191·861·01
 B3·1118150315160751·00·80·0630·1240·0510·0000·000605425681·112·400·88
 B3·1218150315160751·00·80·0780·1240·0510·0000·000705737731·221·890·95
 B3·2118150300150751·00·90·0660·1300·0530·0000·000665426641·222·541·04
 B3·2218150300150751·01·00·0660·1300·0530·0000·000505418540·932·780·93
 B3·3116150305150751·00·80·1330·1450·0590·0000·000525552630·941·000·83
 B3·3216150305150751·00·90·2670·1450·0590·0000·000635572701·140·880·91
 B3·4116150310100751·01·10·0330·1420·0580·0000·000272415371·101·790·73
 B3·4216150310100751·01·10·0330·1420·0580·0000·000262415351·081·760·75
 B3·51a16150305155751·00·80·3210·1450·0590·0000·000795676711·401·041·11
 B3·52a16150305150751·00·80·3210·1450·0590·0000·000755571651·351·061·16
 B3·6115150300150751·01·00·2940·1550·0630·0000·000635674581·130·851·10
 B3·6215150300150751·00·80·1490·1550·0630·0000·000935661911·661·521·03
 B3·71a15150300150751·00·80·1780·1550·0630·0630·000908469921·071·300·97
 B3·72a15150300150751·00·80·1780·1550·0630·0630·0001169268971·261·711·20
Taher (2005)Group I-0242003001502002·21·50·0190·030·0190·0310·00037·5211845·71·792·080·95
 Group III-0252003001502002·21·50·0190·030·0190·0000·00035211836·11·671·940·13
 Group IV-0242003001502002·21·50·0190·030·0000·0310·00034·5211841·01·641·920·14
Mean                1·842·010·95
Standard deviation                0·831·450·13
Coefficient of variation                0·450·720·14

Note: a indicates specimens having 45o bent-up shear reinforcement at the interface between nib and full depth of beam.

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