BEHAVIOR OF ARCHITECTURAL AND STRUCTURAL FOR STEEL FRAM TALL BUILDING SUBJECTED TO BLAST LOADS Ali Kifah Kadhum 2 Assistant Lecturer /University of AL-Mustansiriyah /College of Engineering/ Department of Water Resources https://orcid.org/0000-0002-6722-1890 E-mail: alikifah@uomustansiriyah.edu.iq Abstract This paper aims at studying the effect of blast loading on the constructional design of a 12-storey Steel frame residential building from different weight of TNT. This type of loading should be taken into considerations now in Iraq, especially after the The terrorist attack is from the explosions that the State of Iraq is going through from the year 2003 to the present day. The explosions must be studied in Iraq to avoid significant losses in human lives and human and economic equipment. The same Steel frame multistory building was designed with three different weights of TNT 100,350 and 750kg in order to discuss the difference from structuring and analysis from drift, displacement and story shear. A commercial package ETABS2018 was used to analyze this 36-meter-high building. The building was analyzed according to the American code, while it was designed according to AISC 360-10 (LRFD) and US Department of Defense TM5-1300 for blast load. The maximum increase displacement it was seen on the 6 th and 7 th storeys amount 291.2%, 291.4% for weight TNT between 350kg-750kg, and the maximum increase displacement it was seen on the 2 nd and 3 rd storeys amount 256.7%, 256% for weight TNT between 100kg-350kg.The maximum increase drift it was seen on the 6 th and 7 th storeys amount 295%, 293% for weight TNT between 350kg-750kg, and the maximum increase drift it was seen on the 2 nd and 3 rd storeys amount 256%, 254% for weight TNT between 100kg-350kg., we can see the increase base shear with different weight 100kg-350kg, take result base shear, amounts increased by about 256 % of blast load 100 kg-350, and the maximum increase base shear it was seen in the amount 283% for weight TNT between 350kg-750kg Key words: Blast load, ETABS, Tall building, standoff, TNT. Irregular building Lina K. Kadhum 1 Assistant Lecturer /University of AL-Mustansiriyah /College of Engineering/ Department of architecture e-mail: linakifah33a@gmail.com Journal of Xi'an University of Architecture & Technology Volume XII, Issue IV, 2020 ISSN No : 1006-7930 Page No: 5762