CAPITOLUL 1

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80 X(t) ϕ/ω Rezolvare µ * F0δ⋅sin(-ϕ1) Probleme rezolvate. Sisteme cu 1 GLD – vibraţii forţate T = 0.3425 s Fig. 2.21 Aω=0.1846 m⋅s 1 ν = 18%, Rt = 2 daN/cm 2 , Cz = 4 daN/cm 3 (pt.Rt=2daN/cm 2 ), CORECTAT 10 2 C = = 6, 3daN / cm Z A f Pulsaţia proprie a ansamblului fundaţie + teren se determină cu relaţia: unde: rezultă: ω = ω = k m CORECTAT k = C ⋅ A Z f Q1 + Q2 m = , g Q2 = V ⋅ γb = ( 2 ⋅ 2 ⋅ 1, 5) ⋅ 24 = 144Km , g ⋅ CZ ⋅ Af Q1 + Q2 Factorul de amplificare dinamică: = 981 ⋅ 6, 3 ⋅ 200 = 2 544 ⋅10 , 67, 3rad / s t
STABILITATEA ŞI DINAMICA CONSTRUCŢIILOR 81 ∗ µ = ∗ µ = ( 1 1 2 2 2 2 − p ) + 4ν p ( 1 1 ; p = θ ω = 60 67, 3 2 2 2 2 − 0, 89 ) + 4 ⋅ 0, 18 ⋅ 0, 89 = = 0, 89 Presiunile maxime şi minime pe talpa fundaţiei se calculează cu expresia: în care: şi Obţinem în final: σ max min = σ θ ± µ σ Fo 2, 6 2 Q Q Q1 + Q2 544 ⋅ 10 2 σ = = = = 1, 36daN / cm Af Af 200 ⋅ 200 2 Fo Fo 40 ⋅10 2 σ = = = 0, 1daN / cm Af 200 ⋅ 200 2 2 σ max = 1, 62daN / cm < 2daN / cm = R t 2 σ min = 1, 10daN / cm Deplasările maxime şi minime, pe verticală, ale fundaţiei sunt date de relaţia: unde: max min Q st y = y ± µ y Fo st 2 Q Q Q1 + Q2 544 ⋅ 10 yst = = = = 0, 216cm CZA f CZA f 6, 3 ⋅ 200 ⋅ 200 2 Fo Fo 40 ⋅10 yst = = = 0, 016cm CZA f 6, 3 ⋅ 200 ⋅ 200 şi efectuând calculele obţinem: y min = 0,174 cm. max = 0,258 cm, y .
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CONSTANTIN IONESCU STABILITATEA ŞI
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4 Cuprins 3.4. Vibraţii forţate p
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1.1.Generalităţi CAPITOLUL 1 STAB
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8 Stabilitatea şi Dinamica Constru
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10 1.2.4. Modelarea sistemelor Stab
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12 Stabilitatea şi Dinamica Constr
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14 1.2.6. Sistem dinamic (vibrant)
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16 a. m k a. m k x(t) x(t) c 1GLD b
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22 a. x(t) F(t) m b. u(t) Sisteme c
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24 b. pentru situaţia aplicării i
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26 Sisteme cu un grad de libertate
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28 Sisteme cu un grad de libertate
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Page 38 and 39: 38 1.1.3 1.1.2 1 EI=const 1.1.5. m
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Page 74 and 75: 74 δ ss δ ss = δ 11 + 2δ Calcul
Page 76 and 77: 76 3. Determinarea răspunsului în
Page 78 and 79: 78 X(t) ϕ/ω=0.01782 s x0ω 2 Apli
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Page 112 and 113: 112 5.6.1. Folosirea metodei forţe
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Page 118 and 119: 118 3.4 1 3.3 2EI 0.5l m2 Probleme
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Page 124 and 125: 124 Probleme rezolvate. Sisteme cu
Page 126 and 127: 126 δ 11 Probleme rezolvate. Siste
Page 128 and 129: 128 εa εr % = ⎛ 3 ml ⎞ 94⎜
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130 2. Determinarea matricei de fle
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132 Probleme rezolvate. Sisteme cu
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134 şi matricea de flexibilitate d
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136 a. c. 1. 3265 2. 4458 e. y , 2
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138 Matricea de flexibilitate se co
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142 6EI 2 a a. 6EI 2 a c. 4EI a f.
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CAPITOLUL 6 SISTEME VIBRANTE CU nGL
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STABILITATEA ŞI DINAMICA CONSTRUC
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PROBLEME PROPUSE 2 SISTEME CU n GLD
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CAPITOLUL 7 SISTEME VIBRANTE CU NGL
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9.1. Grinda încastrată CAPITOLUL
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CAPITOLUL 11 CALCULUL DE STABILITAT
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CAPITOLUL 14 CALCULUL DE ORDINUL II
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BIBLIOGRAFIE B 1. Bănuţ, V., Calc
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CAPITOLUL 1

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