14.5 m reinforced concrete span emergency aid

I need to pass a span of 14.5 m as reinforced concrete. I thought of a solution as in the loaded file, but I did not apply the loads on it exactly. There will be a basketball court on the building..I am looking for a suitable method and I have to find it in a short time. If you can help me, I will be very pleased. Thank you from now.
 
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