Resolução de Exercícios Carregamento Axial

Resolução de exercícios Carregamento axial

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1- O navio é impulsionado na água pelo eixo de uma hélice de aço A-36 com 8m de comprimento medido desde a hélice até o mancal de encosto D no motor. Se o eixo tiver diâmetro externo de 400 mm e espessura de parede de 50 mm, determine a quantidade de contração axial do eixo quando a hélice exercer uma força de 5 kN sobre o eixo. Os apoios em B e C são mancais de deslizamento. (Eaço = 200 GPa).

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2- A coluna de aço A-36 é usada para suportar as cargas simétricas dos dois pisos de um edifício. Determine o deslocamento vertical de sua extremidade, A, se P 1 = 200 kN, P 2 = 310 kN e a coluna tiver área de seção transversal de 14.625 mm².

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3- A coluna de aço A-36 é usada para suportar as cargas simétricas dos dois pisos de um edifício. Determine as cargas P 1 e P2 se A se mover 3 mm para baixo e B se mover 2,25 mm para baixo quando as cargas forem aplicadas. A coluna tem área de seção transversal de 14.625 mm². (Figura: a mesma da questão 2).

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4- O eixo de cobre está sujeito às cargas axiais mostradas na figura. Determine o deslocamento da extremidade A em relação à extremidade D se os diâmetros de cada segmento forem d AB = 20 mm, dBC = 25 mm e d CD = 12 mm. m m. Considere Considere E cobre = 126 GPa.

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5- O conjunto é composto por uma haste CB de aço A-36 e uma haste BA de alumínio 6061-T6, cada uma com diâmetro de 25 mm. mm . Determine as cargas aplicadas P1 e P2 se A se deslocar 2 mm para a direita e B se deslocar 0,5 mm para a esquerda quando as cargas forem aplicadas. O comprimento de cada segmento quando não alongado é mostrado na figura. Despreze o tamanho das conexões em B e C e considere que elas são rígidas. (E aço = 200 GPa e Eal = 68,9 GPa).

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6- A coluna é construída de concreto de alta resistência e seis hastes de reforço de aço A-36. A-36. Se ela for submetida a uma força axial de 150 kN, determine a tensão normal média no concreto e em cada haste. Cada uma tem diâmetro de 20 mm.

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7- A coluna é construída de concreto de alta resistência e seis hastes de reforço de aço A-36. A-36. Se ela for submetida a uma força axial de 150 kN, determine o diâmetro exigido para cada haste, de modo que ¼ da carga seja suportada pelo concreto e ¾, pelo aço. (Considere a mesma figura do exercício 6).

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8- A coluna é construída de concreto de alta resistência e seis hastes de reforço de aço A-36. A-36. Se ela for submetida a uma força axial de 150 kN, determine o diâmetro exigido para cada haste, de modo que ¼ da carga seja suportada pelo concreto e ¾, pelo aço. (Considere a mesma figura do exercício 6).

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9- As peças fundidas rígidas A e B estão conectadas por dois parafusos de aço CD e GH de 19 mm de diâmetro e estão em contato com as extremidades de uma barra de alumínio EF com diâmetro de 38 mm. Cada parafuso tem rosca simples com um passo de 2,5 mm e, depois de serem ajustadas, as porcas em D e H são apertadas em ¼ de volta cada uma. Sabendo que E é 200 GPa para o aço e 70 GPa para o alumínio, determine a tensão normal na barra.

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