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Дата добавления: 2015-09-15; просмотров: 724
В соответствии с п. 7.5 [1] необходимо проверить устойчивость стенки в зоне развития пластических деформаций. Должно выполняться условие:
где коэффициент a определяется по формуле:
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Условие не выполняется.
Увеличиваем размеры пояса в середине пролета до bf × tf = 380×20 мм. Тогда:
Проверяем местную устойчивость сжатого пояса при его ширине 380 мм:
 .
Условие выполняется. Оставляем сечение пояса в середине пролета bf × tf= 380×20 мм.
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