analisis de estructuras bajo acciones dinámicas -arturo m. cassano

7/25/2019 Analisis de Estructuras Bajo Acciones Dinmicas -Arturo m. Cassano

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ACI Committee 549

Thin Reinforced Cementitious Products & Ferrocement

ACI Spring Convention, Chicago, I, !"#"

$eeting $inutes

$arch !#, !"#"

9 %" am to #%" pm

Attendance

$em'ers (isitors

Dubey, A., Chairman Chan, C.

Jones, J., Secretary Gebremedhia, M

Aldea, C. Tafesse, E.Freedman, S. Pen !.

Mari"unte, S. #einhardt, $.%.

Shafer, S.&rameshuber, %.

Shah, S. $in'en, M.

Shao, !. Shelton, S.

DiEarlo, T.Patterson, J.

Glo(ania, M.

Janeteto, S

&uttner, T.

Jesse, F.

)ieboldt, M.

*moreie, F.)eonson, M.

+oana, S.

#) Ca** to +rder

The meetin (as called to order by Chairman Ashish Dubey at -/0 am.

Committee meetin attendees (ere introduced.

!) Previous $inutes


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Minutes of the 1e( *rleans meetin held on 1o2ember 3th, 400- (ere aro2ed

unanimously.

) Announcements

#5)EM 5nternational Conference on Material Science on 6 7 80 Setember,

4080, in Aachen, Germany (ill include the 4nd5CT#C on Te9tile #einforced

Concrete :information at (((.rilem.or;.

AC5 committee


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6) 7pdating ACI 549 Reports on Ferrocement

The t(o AC5 ourned at 8/0 m by ne( Chairman John Jones.


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#esectfully submitted by Committee Secretary John Jones.


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6/22


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Minutes RILEM TC TDT 2. MeetingSession: March 21, 2010

Venue: Chicago, Illinois, USA

Participants%%. &rameshuber :Aachen, Germany; as chair TC TDTM. $in'en :Aachen, Germany; as secretary TC TDT

A. Dubey :5llinois, SA; as chair AC5 oint meetin toether (ith AC5 Committee


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Chater Scoe

Prof. &rameshuber emhasi'es that not the material beha2ior but only the test rocedure

is co2ered by the recommendation.

Chater Definitions

5nstead of definin a tensile secimen as slender a lenth to (idth ratio (assecified.

The ma9imum rain si'e of fine rained concrete (as chaned to = mm instead of 4

mm.

5t (as discussed that the first macro crac" of the secimen is difficult to locali'e at

certain secimens (ith hih reinforcement ratio. Therefore, the first crac" stress (as

related to the )*P :loss of roortionality; of the stress@strain cur2e.

The definition of te9tile (as chaned into fabrics and other manufactured roducts

made from fibers and from yarns.

Chater Test secimens

All dimensions in Fi. 8 and 4 are minimum dimensions

Minimum dimensions resultin from the ma9imum rain si'e (ill be art of the

commentary

The recommendation to use at least 6 ro2in strands er layer (as remo2ed. 5nstead, it

(as secified that a strain@hardenin beha2ior is aimed at.

The standard storae of the secimens (as chaned to (ater storae to a2oid (arin

and to reduce the scatter. 5t (as areed that a dearture from the reference storae isossible but has to be stated in the reort.

Chater Test euiment

The accuracy of the testin machine shall be in accordance (ith 5S* -


9/22

Chater Test reort

5t (as suested to ro2ide the reinforcement ratio in addition to the number of te9tile

layers if ossible. Failure stress (as chaned into ultimate load. 5f ossible the ultimate stress referred to

both the cross@sectional area of the secimen and the te9tile should be calculated.

Failure strain (as chaned into ultimate strain.

1e9t stes

All chanes (ill be made (ithin the ne9t 4 months. Then the recommendation is send toall members for a final re2ie(. Additionally a first draft of a commentary for the

recommendation is send. There (ill be round robin tests before the ne9t meetin in

Aachen in Setember 4080. 5t is lanned to test three different tyes of secimens

8. secimens (ith hih stiffness, manufactured by the Dresden rou

4. secimens (ith normal te9tile reinforcement :Dresden and Aachen;

/. secimens (ith a hih reinforcement ratio or short fibers to achie2e a 2ery fine crac"attern, manufactured by the Aachen rou

The schedule (ill be discussed (ith the Dresden rou (ithin the ne9t (ee"s.

2iscussion of the draft of the pu**


10/22

A first discussion of the desin rou (as ostoned to the ne9t meetin in Aachen. A

roosal for the lanned contents and a time schedule (as reared by Prof. $eer and

Dr. %ill from Aachen and resented by Prof. &rameshuber. The roosal is attached tothe minutes. To ensure statistically firm desin 2alues a database (ith test results shall be

created. A first draft of the desin rules (ill be resented at the ne9t meetin in Aachen.

2efinition of Ferrocement

5t (as areed in the rou that usin the term Ferrocement for all thin reinforcedcementitious comosites is misleadin. Althouh the AC5 State@of@the@Art #eort on

Ferrocement doesnLt e9clude lass as reinforcin material the terms Ferrocement and

T#C should be searated in the future due to the indeendent de2eloment of T#C inrecent years.

Announcements and other pu'*icationsSeptember 6-10, 2010, Aachen, Germany

5nternational Conference on Material Science and 6=th#5)EM Annual %ee" (ith /different themes

@ 4nd5CT#C 7 Te9tile #einforced Concrete

@ $etMat 7 Modellin of $eteroeneous Materials

@ AdiPoC 7 Additions 5mro2in Proerties of Concrete

/e-t meeting of TC T2TThe ne9t meetin :/. Meetin; of the TC TDT (ill be durin the 6=th#5)EM annual(ee" in Aachen, Germany, Septem'er 5, ! p)m, !"#".

Aachen, March 46, 4080, Marcus $in'en :TC TDT secretary;

RILIM TC TDT: Test methos an esign o! te"tile rein!orce concrete 1#$0%$10 Design rules: Contents & time scheule

'ra!t( )age 1 TC TDT: Test methos an esign o! te"tile rein!orce concrete

Design of textile reinforced concrete*ro)osal )re)are + -$ .egger an /$ ill

1 Contents

1$ Introuction Sco)e

2$ /otations an e!initions

%$ asic consierations

Loaing

Sa!et !actors

In!luence o! manu!acturing methos


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3$ Materials 'Strength, Moulus o! elasticit, cree)shrin4age, 5(

Concrete

Ami"tures

Short !i+res

6arns

Te"tile rein!orcement

Coatings

7$ Dura+ilit re8uirements

9")osures

Re8uirements !or the esign

Design Moels

$ Analsis an esign

Design methos

Methos o! analsis

Arrangement o! loas

Re8uire an esign strength

Loa;earing +ehale"ure an a"ial loas

Com)ressile"ure strength

Minimum rein!orcement

#$ Shear an torsion

Shear strength

Torsion


12/22

RILIM TC TDT: Test methos an esign o! te"tile rein!orce concrete 1#$0%$10 Design rules: Contents & time scheule'ra!t( )age 2

?$ Connections o! TRC;Mem+ers

10$ Design o! the Serle"ure strengthening

Shear Torsion strengthening

Ser


13/22

*re)aring an electronic )lat!orm to e"change ata an in!ormation o! the esigngrou)

De


14/22

the total tensile load bearin beha2ior of the comosite material te9tile reinforced

concrete is of imortance.

&ond characteristics of te9tile reinforcement can not be deri2ed from this tensile test

since this information could only be deri2ed indirectly from crac"in atterns.

$o(e2er, in te9tile reinforced concrete crac"in is mainly controlled by trans2ersefibers (hich are tyically resent in te9tile reinforcement. For bond roerties

reference is i2en to the #5)EM recommendation TDT A.4 :ull@out;.

Scope

5t is the aim of this recommendation to describe a standardi'ed unia9ial tensile test.This recommendation resents 4 different test methods for measurin the load@

deformation beha2ior of te9tile reinforced concrete under unia9ial tensile load (ith

fibers alined arallel to the loadin direction. The ultimate strenth of the te9tile, thefirst crac" stress of the concrete as (ell as the stress@strain cur2e of the comosite

secimen (hich are necessary for the desin of te9tile reinforced concrete can be

determined from the test data. The recommendation is only 2alid for uasistatic

testin.

Referenced standards

5S* -


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=. Te9tiles are fabrics and other manufactured roducts made from fibers and from

yarns.


16/22

Fiure 8 Dumbbell secimen :tye 8; ?&ro04?

Fiure 4 #ectanular secimen :tye 4; ?Jes0-?

Storage of test specimensTest secimens are stored in (ater to reduce (arin and scatterin.


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Test e>uipment

Climate

The tests are carried out in an air@conditioned room at a temerature of 40 O 4 C and

a relati2e humidity of 6< O < H.

Testing machine

The testin machine shall be of any tye sufficient to ro2ide the reuired load and

the rate of crosshead mo2ement rescribed. 5t shall ha2e been 2erified to ha2e an

accuracy of the e9tensometers in accordance (ith 5S* -


18/22

Fiure / Test setu for secimen tye

8 ?*rl03?

Fiure = Test setu for secimen tye 4

?Jes0-?

Measuring devicesThe load can be measured (ith a standard load cell of roer caacity and accuracy.Deformations are measured on both surfaces in the middle of the secimen (ith

de2ices of sufficient measurin rane and accuracy.

Test procedure

Preparation of specimens

5n the load introduction area, all o2erlain concrete edes must be remo2ed from

the secimens. )ocal buminess should be remo2ed (ith a rinder.

&efore testin

Secimen dimensions are measured as follo(s

o %idth at both ends of the measurin lenth, accuracy of 0.8 mm

o Thic"ness is measured at = oints inside the measurin area, accuracy

of 0.8 mm.

o )enth, accuracy of 8 mm


19/22

+isible re@damae :e.. crac"in, ore concrete uality; has to be

documented

De2iations from rescribed secimen eometry and measures for elimination

ha2e to be documented, e.. de2iations from arallel reinforcement, une2enconcrete surface, fibers in sa(in cut, etc.

Installation of specimens

Secimens are mounted into the tension de2ice. &et(een the steel arts and the

concrete secimen a thin sheet of rubber (ith a thic"ness bet(een 0./ and 8 mm has

to be arraned to a2oid local load concentrations durin the test. The secimen isreloaded (ith a force of 0.8 "1. Deformation measurin euiment is fastened on

both secimen surfaces.

Test procedure

The tensile tests are carried out in deformation controlled mode by crosshead

dislacement at a strain rate of 4 I 80@/? min. The test is finished at a loss of at least B0

H of the ultimate load.

8va*uation of test resu*ts

Strain

To determine the strain of the tensile secimen, the measured deformations lof the

e9tensometer are a2eraed and then related to the measurin lenth lm.

mll=

ltimate strain uis defined as strain at ma9imum loadFu.

muu lFl ;:=

Stress

For the determination of the stresses, the measured forceFcan either be related to thereinforcement cross@sectionAfor to the cross@section of the secimenAc.

ff AF= or cc AF=

ltimate Stress fuand cu, resecti2ely is defined as stress at ma9imum loadFu.fufu AF= or cucu AF=

Stress-strain-relation

The main test result is the stress@strain@beha2ior, resented in form of 9@y@diarams

(ith strains on the 9@a9is and stresses on y@a9is.


20/22

Assessment of tensi*e test

The tensile test is only 2alid if the fracture occurred (ithin the measurement lenth of

the secimen. Fractures of secimens outside this area lead to incorrect results after

the final crac".

Test report

The test reort shall include at least the follo(in information

A reference to this test recommendation

*riin and indication of the test secimens

*riin, indication and material of the te9tile fabrics

Tye of Secimen :tye 8 or 4;, Dimensions :accuracy see section B;

Storae conditions :(ater temerature and air temerature in C, relati2e humidity inH;

)ocation?Position and numberof te9tile layers

#einforcement ratio if "no(n

Secimen ae at time of testin in days

Position of crac" locali'ation :free lenth ? at clamin;

Stress@strain@diaram as a mean cur2e of all strain aues and if a2ailable, sinle

cur2es

Statistics

o Dimensions of the secimens :thic"ness, (idth, lenth; and a2eraed

thic"ness and (idtho First crac" stress if reco2erable

o Tye of failure :fiber ruture, fiber ull@out, others;

o ltimate load of the secimens and if ossible the ultimate stress referred to

the cross sectional area and the area of te9tile reinforcement

o ltimate strain of the secimens

All details of testin that de2iate from this recommendation ha2e to be documented.

References


21/22

?&ro04? &roc"mann, J. #auach, M. Durability 5n2estiations on Te9tile #einforced

Concrete. Durability of Materials and Comonents, -th 5nternational Conference

:CS5#* 4004;, &risbane, Australia, 8B@40 March 4004. Paer 1o. 888

?*rl03? *rlo(s"y, J. #auach, M. Durability Model for A#@lass Fibres in Te9tile

#einforced Concrete. Materials and Structures =8 :4003; B, . 844


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! Cont"ct*ro!$ Dr$;Ing$ -ose! .eggerRT. Aachen Uni

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