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zeromode Iei din cont

Q1 - PLCI PLANEENCIPEDIA>EDUCATIONAL>QUIZ...>PLACI PLANEPUBLICAT LA 15.03.2013SCRIS DE VIOREL POPA

Reprezentai o soluie de armare de principiu pentru placa din figur, incluznd toate tipurile dearmturi. Placa este simplu rezemat pe patru reazeme liniare paralele cu latura scurt.

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termeni i condiii politic de confidenialitate

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Q1 - GRINZI DE BETON ARMAT
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ENCIPEDIA>EDUCATIONAL>QUIZ...>GRINZIPUBLICAT LA 17.03.2013SCRIS DE VIOREL POPA

Pentru estacada din figur, stabilii o modalitate de armare longitudinal a grinzii, n carearmturile longitudinale din cmpuri i reazeme s fie aceleai, astfel nct grinda sndeplineasc condiia de rezisten la ncovoiere pentru o ncrcare util cu valoareacaracteristic qk=0,8t/m

2uniform distribuit pe toat suprafaa plcii.

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Q1 - STRUCTURI CU PEREI DE BETON

ARMATENCIPEDIA>EDUCATIONAL>QUIZ...>STRUCTURI CU PEREIPUBLICAT LA 19.06.2013SCRIS DE VIOREL POPA

S se determine armtura transversal i s se verifice dac seciunea de beton este suficientpentru grinda de cuplare din figur, conform prevederilor CR2-1-1.1. Grinda face parte dintr-ostructur cu perei de beton armat proiectat s rspund neliniar sub aciunea cutremurului deproiectare.
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Q1 - STRUCTURI N CADRE DE BETONARMAT

ENCIPEDIA>EDUCATIONAL>QUIZ...>STRUCTURI N CADREPUBLICAT LA 19.06.2013SCRIS DE VIOREL POPA

Determinai armtura transversal pentru grinda din figur, sub form de etrieri. Grinda aparineunei structuri n cadre de beton armat proiectat s rspund neliniar sub aciunea cutremuruluide proiectare. Dac este necesar se poate redimensiona seciunea de beton prin creterea nlimiiinimii grinzii.


termeni i condiii
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Q2 - GRINZI SCURTE DE BETON ARMATENCIPEDIA>EDUCATIONAL>QUIZ...>GRINZI SCURTEPUBLICAT LA 19.06.2013SCRIS DE VIOREL POPA

Pentru grinda scurt din figur :1. Construii un model strut&tie pentru calcul grinzii.

2. Artai modul de dimensionare a armturilor care constituie tiranii din model i de verificare aseciunii de beton n reazem pe bazamodelului strut&tie reprezentat.




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Q1 - PLANEE DE BETON ARMATENCIPEDIA>EDUCATIONAL>QUIZ...>PLANEEPUBLICAT LA 19.06.2013SCRIS DE VIOREL POPA

Pentru trama din figur s se rezolve planeul utilizndu-se o soluie cu grinzi pricipale i grinzisecundare:

Predimensionai nlimea grinzilor principale din condiia de rigiditate (grinzile principale suntaxate pe axele modulare ale construciei i au limea de 400mm). Predimensionai nlimea
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grinzilor secundare din condiia de rigiditate i dispunei-le n plan(grinzile secundare marginalesunt axate pe axele modulare ale construciei). Predimensionai placa din condiia de rigiditate

Stabilii grosimea plcii astfel nct procentul de armare n reazemele i cmpurile interioare (c,2 i 3) s se situeze n jurul valorii de 0,85%. Valorile de proiectare ale momentelorncovoietoare n cmpul 1 i reazemul b se iau egale cu ql2/11 iar n celelalte seciuni

caracteristice (c, 2 i 3) se iau egale cu ql

2

/16. Calculai i dispunei armtura n plac. Realizaio schi complet de armare. Calculai armtura longitudinal i transversal n grinda secundar




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Q1 - PROIECTAREA SEISMICASTRUCTURILOR DE BETON ARMATENCIPEDIA>EDUCATIONAL>QUIZ...>PROIECTAREA SEISMICPUBLICAT LA 19.06.2013SCRIS DE VIOREL POPA

Enumerai criteriile practice n funcie de care se stabilete factorul de comportare q conform

prevederilor P100-1. Ce nelegei prin sintagma structura cu ductilitate ridicat?Discut acest articol pe forum. Nici un comentariu.Las un comentariu



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Dimensionai armturile i reprezentai o schi de armare de principiu pentru placa din figurncrcat uniform distribuit cu 1t/m2




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zeromode

Iei din cont

Q2 - STRUCTURI CU PEREI DE BETONARMAT

ENCIPEDIA>EDUCATIONAL>QUIZ...>STRUCTURI CU PEREIPUBLICAT LA 19.06.2013SCRIS DE VIOREL POPA

S se determine fora tietoare capabil a peretelui din figur considernd c zona plastic se aflla baza peretelui, conform CR2-1-1.1 (otel S500, beton C25/30). Peretele face parte dintr-ostructur cu perei de beton armat proiectat s rspund neliniar sub aciunea cutremurului deproiectare.
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Precizai dezavantajele structurale ale utilizrii planeelor decalate pe vertical, la acelai nivel,pentru o structur n cadre de beton armat.Discut acest articol pe forum. Nici un comentariu.Las un comentariu



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Q3 - PLCI PLANE
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ENCIPEDIA>EDUCATIONAL>QUIZ...>PLACI PLANEPUBLICAT LA 15.03.2013SCRIS DE VIOREL POPA

Placa din figur armat cu cte 5 10/m la ambele fete, pe ambele directii, ndeplinete condiiade rezisten la ncovoiere pentru o ncrcare de 2t/m2? (se admite redistribuia eforturilor prindeformaii postelastice ale armturii)




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Q2 - GRINZI DE BETON ARMATENCIPEDIA>EDUCATIONAL>QUIZ...>GRINZIPUBLICAT LA 17.03.2013SCRIS DE VIOREL POPA

S se dimensioneze armtura longitudinal din grinda prefabricat considernd c grinda este

ncrcat gravitaional de panele de acoperi aezate la partea superioar grinzii a cror reaciuneeste de 300kN i, respectiv, 200kN. Aceste valori reprezint valorile factorizate, multiplicate cufactorii supraunitari de combinare a aciunilor. Pentru simplificare, centrul de greutate alarmturii longitudinale se va considera c corespunde cu centrul de greutate al tlpii grinzii dinzona ntins.
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Scriei expresia de calcul a curburii ultime pentru o seciune solicitat la compresiune excentric.Se cunosc legile fizice de comportare - ale materialelor i nlimea zonei comprimate nstadiul ultim. Cum influeneaz creterea forei axiale curburaultim a seciunii?Discut acest articol pe forum. Nici un comentariu.Las un comentariu



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Verificai dac seciunea de beton propus este suficient i dimensionai armtura transversal ilongitudinal pentru grinda din figur. Grinda este rezemat pe stlpi prin intermediul a douplcue metalice 60x60x20mm. Grinda este ncrcat conform schiei cu cte patru perechi defore de 200kN aezate pe talpa de la partea de jos. Aceste valori reprezint valorile caracteristiceale ncrcrii.Grinda este realizatdin beton C30/35 ise va arma cu oelBST500.




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FORUM zeromode Iei din cont

Q4 - PLCI PLANEENCIPEDIA>EDUCATIONAL>QUIZ...>PLACI PLANEPUBLICAT LA 15.03.2013SCRIS DE VIOREL POPAPentru o plac ncrcat uniform distribuit avnd schema de rezemare conform figurii de mai joscare este raportul dintre ncrcarea maxim pe care o poate suporta placa i ncrcareacorespunztoare intrrii n curgere (formrii primei linii de plastificare)?




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zeromode

Iei din cont


n care dintre cele patru figuri este reprezentat mai fidel starea de fisurare a unei grinzi simplurezemate, ncrcat uniform distribuit? Justificai alegerea!
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Q4 - PROIECTAREA SEISMICASTRUCTURILOR DE BETON ARMAT

ENCIPEDIA>EDUCATIONAL>QUIZ...>PROIECTAREA SEISMICPUBLICAT LA 19.06.2013SCRIS DE VIOREL POPA

Cum explicai scderea rezistenei elementelor de beton armat solicitate ciclic n domeniulinelastic la compresiune excentric (N=ct)?Discut acest articol pe forum. Nici un comentariu.Las un comentariu



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Pentru o plac ncrcat uniform distribuit rezemat pe contur conform figurii care ncrcareamaxim corespunztoare limitei superioare a rspunsului elastic?




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n care dintre cele patru figuri este reprezentat mai fidel starea de fisurare a unei grinzi simplu

rezemate, ncrcat cu patru fore concentrate la partea superioar? Justificai alegerea!




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Dintre metodele de calcul structural prevzute de codul de proiectare seismic P100-1, cenelegei prin calcul static neliniar?Discut acest articol pe forum. Nici un comentariu.Las un comentariu



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Q6 -PLCI PLANE

ENCIPEDIA>EDUCATIONAL>QUIZ...>PLACI PLANEPUBLICAT LA 15.03.2013SCRIS DE VIOREL POPA

Care este valoarea ncrcrii gravitaionale uniform distribuit, qmax, pe care o poate suportaplaca din figur rezemat conform (a) si armat conform (b)?(hf=12cm, c=1,5cm, fyd=300, fcd=15).
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Dac se introduce un reazem intermediar pentru aceast plac, la jumtatea deschiderii (vezi (c)),soluia de armare propus iniial (vezi (b)) este corespunztoare pentru a prelua sarcina2qmax(justificai)?n situaia dispunerii reazemului intermediar (vezi (c)), schiai modul de dispunere a armturii

de rezisten n plac dac 80% din ncrcarea gravitaional este cauzat de aciuni variabile.Discut acest articol pe forum. Nici un comentariu.Las un comentariu



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zeromode

Iei din cont


n care dintre cele patru figuri este reprezentat mai fidel starea de fisurare a unei consolencrcat cu o for concentrat la capt? Justificai alegerea!
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n proiectarea structurilor de beton armat expuse la aciuni seismice orizontale, care este scopulverificrii rigiditii structurale? Dar a rezistenei laterale a structurii?




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n care dintre cele patru figuri este reprezentat mai fidel starea de fisurare a unei grinzi simplurezemate, ncrcat cu patru fore concentrate aplicate la partea de jos? Justificai alegerea!
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n proiectarea structurilor n cadre de beton armat expuse la aciuni seismice orizontale, care estescopul verificrii deplasrilor la starea limit ultim conform prevederilor P 100-1?Discut acest articol pe forum. Nici un comentariu.Las un comentariu



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Care dintre cele trei soluii de armare este mai potrivit pentru grinda din figur? Grinda estencrcat gravitaional uniform distribuit n direcie orizontal. Justificai rspunsul!
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FORUM zeromode Iei din cont


Pentru cadrul plan din figur, reprezentai forma mecanismului de plastificare sub ncrcrilaterale, n planul cadrului, indicnd poziia articulaiilor plastice i semnul acestora.Considernd c la nivelul acoperiului acioneaz, n planul cadrului, o for seismic deproiectare Fb, comentai n ce msur momentul global de rsturnare pe cadru este echilibrat prinncovoierea proprie a stlpilor i prin efectul indirect al forelor axiale care se mobilizeaz nstlpi.

Cum se modific rspunsul local i de ansamblu al construciei dac n imediata vecintate astlpului marginal se execut o construcie anex din zidrie cu nlimea de 7,00m, fr rostseismic de separare. Indicai modurile posibile de cedare a halei.




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Care dintre cele trei soluii de armare este mai potrivit pentru grinda din figur? Grinda estencrcat gravitaional uniform distribuit n direcie orizontal. Justificai rspunsul!
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Dimensionai armtura longitudinal pentru grinda din figur! ncrcarea variabil pe grind esteuniform distribuit n direcie orizontal. Valoarea caracteristic a ncrcrii variabile este de15kN/m. Grinda este rezemat la capete prin intermediul a dou plcue metalice200x200x20mm.


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Pentru grinda din figur:1. Stabilii cantitatea minim de armtur longitudinal conform coeficientului minim de armare

dat n SR EN1992-1

2. Reprezentai configuraia grinzii cu zbrele echivalente pentru calculul la for tietoare conformmodelului din SR EN 1992-1, considernd un unghi de nclinare al diagonalei comprimate de31.

3. Calculai fora VRd,scorespunztoare unghiului =31 considernd o armare transversal curentcu etrieri cu dou ramuri 10/250mm.

4. Reprezentai calitativ o schi de armare de principiu pentru grind, evideniind zona cu etrierindesii.




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Pentru placa din figura, ce valoare are procentul de armare longitudinal a plcii n reazemul

central?

Cum se justific procentul de armare mai redus al plcii n reazemul marginal comparativ cu celdin reazemul central (transversal)?Cum se justificprocentul de armare mai sczut al plcii, la partea de jos, pe direcie transversalcomparativ cu cel din direcie longitudinal?Calculai valoarea ncrcri maxime uniform distribuite pe care o poate suporta placa, qmax.Discut acest articol pe forum.Nici un comentariu.Las un comentariu



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Pentru cadru plan din figur, dimensionai armtura longitudinal din grinda prefabricat (sedispune armtur constat pe deschidere i se neglijeaz greutatea proprie a grinzii; se poateconsidera simplificat c centrul de greutate al armturii longitudinale ntinse coincide cu centrulde greutate al zonei evazate de la partea ntins).
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Verificai grinda la ncovoiere n zona central (ntre pane) considernd c momentul capabil algrinzii variaz proporional cu nlimea seciunii transversale a grinzii.




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Se d copertina din figur, care adpotete un peron pentru tren. Placa reazem pe un ir de stlpicu sectiunea 25x40, aflai la distana interax de 8,00m, prin intermediul unei grinzi longitudinalecu seciunea 25x60. Stabilii modul de descrcare a plcii (justificai) i dimensionai armturalongitudinal a acesteia, n seciunea de moment maxim, considernd o ncrcare total, uniform

distribuit pe suprafa orizontal, de 6kN/m

2

(valoare de calcul). Realizai o schi de armare aplcii detaliind numai armturile de rezisten. Verificai placa la ncovoiere pe ntreagadeschidere, innd cont de seciunea variabil a acesteia, considernd, pentru simplificare, cmomentul capabil variaz proporional cu nlimea util a seciunii transversale a plcii.
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Determinai ncrcarea uniform distribuit maxim pe care o poate suporta un panou ptrat deplac rezemat pe dou laturi opuse. Placa este armat n planul median cu o singur plas 8/100pe ambele direcii (Beton C20/25, Oel PC52).


termeni i condiii
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Care dintre plcile de mai jos, ncrcate uniform distribuit pe toat suprafaa, descarcpreponderent pe o direcia laturii mai scurte? Care dintre plci are strict descrcare

unidirecional?




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