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can i have a concrete beam to span 25 meters to support a gallery in an auditorium without intermediate support?

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NO YOU CAN'T. 25 feet is the MAX span length in case of concrete and better to keep span length less than 25 ft. Over 25 ft, use PRESTRESS CONCRETE and I don't think if you will be able to provide 25*3.28 = 82 ft span. Its too much ! Use steel structure instead as that will be better option and will be reliable and economical.
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