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Консультация № 128943
25.03.2008, 08:40
0.00 руб.
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Помогите с решением задачи. Горизонтальный швелер,(профиль № 30) l=5 м, на конце испытавает нагрузку 1600 кг. Выдержит ли он нагрузку, допустимое напряжение 2400 кг/см^2. Если нет то, что зделать (изменить конструкцию, добавить расскос, поперечные связи), чтобы обеспечить данную нагрузку.
Приложение:
Приложение:
Обсуждение
25.03.2008, 11:45
общий
это ответ
Здравствуйте, Давыдкин Сергей Михайлович!
Это не физика, а сопромат; расчёты будем делать в соответствующих единицах. Изгибающий момент: M<sub>изг</sub> = 500 см*1600 кГ = 800000 кГсм. Момент сопротивления W<sub>x</sub> (надеюсь, нагрузка действует параллельно стенке) швеллера № 30 (по ГОСТ 8240-89: Швеллеры стальные горячекатаные Сортамент): W<sub>x</sub> = 387 см<sup>3</sup>. Напряжение σ<sub>изг</sub> = M<sub>изг</sub>/W<sub>x</sub> = 800000/387 = 2065 кг/см<sup>2</sup> < 2400 кг/см<sup>2</sup>. Выдержит. Однако, для реальной конструкции советую всё же почитать учебник по сопромату - напряжение близко к пределу упругости, а у швеллеров при неправильном приложении нагрузки возникает "изгиб с кручением"; как избежать - найдёте в учебнике.
Это не физика, а сопромат; расчёты будем делать в соответствующих единицах. Изгибающий момент: M<sub>изг</sub> = 500 см*1600 кГ = 800000 кГсм. Момент сопротивления W<sub>x</sub> (надеюсь, нагрузка действует параллельно стенке) швеллера № 30 (по ГОСТ 8240-89: Швеллеры стальные горячекатаные Сортамент): W<sub>x</sub> = 387 см<sup>3</sup>. Напряжение σ<sub>изг</sub> = M<sub>изг</sub>/W<sub>x</sub> = 800000/387 = 2065 кг/см<sup>2</sup> < 2400 кг/см<sup>2</sup>. Выдержит. Однако, для реальной конструкции советую всё же почитать учебник по сопромату - напряжение близко к пределу упругости, а у швеллеров при неправильном приложении нагрузки возникает "изгиб с кручением"; как избежать - найдёте в учебнике.
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