أرسل هذا في رسالة قصيرة: NUMERICAL STUDY OF DYNAMIC RESPONSE OF STEEL STRUCTURES DUE TO VERTICAL EARTHQUAKE LOAD WITH CONSIDERING AXIAL FORCE IN COLUMN THAT PROPAGATE AND BOUNCE

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/ //---`' | || | ||    /   ||   -| ||-  | // __   
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  `----`    `---`       -|_||  `-----`    `---`   
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