For the case $3,$ determine the maximum concentrated service load $P$ that can act at midspan on a simply supported span. Lateral support exits only at the ends of the span. The service load is $70\%$ live load and $30\%$ dead load.

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For the case $3,$ determine the maximum concentrated service load $P$ that can act at midspan on a simply supported span. Lateral support exits only at the ends of the span. The service load is $70\%$ live load and $30\%$ dead load.

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