The present invention describes an economical beam-column design which consist of a concrete filled square tubular beam and a concrete filled double skin square tubular column with inner circular tube and the space between them infilled with M30 grade fly- ash concrete: The beam and the column are connected by through bolts to form the inverted T shape beam-column structure. The fly ash concrete infilled columns of the cold-formed beam-column specimen are wrapped with GFRP sheets for achieving high lateral load carrying capacity which is an important property in earthquake resistant structures.
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