CONCRETE-FILLED TWIN-LAYER STEEL-SHEET CWS SYSTEM: A SYSTEMATIC REVIEW OF THE LITERATURE
RECENTLY, THE CONCRETE-FILLED TWIN-LAYER STEEL-SHEET COMPOSITE WALL SYSTEMS (TSCWS) HAVE BECOME RECOMMENDED BY THE ENGINEERS IN THE MODERN STRUCTURES, SINCE IT HAS HIGH ENERGY ABSORPTION, DUCTILITY, AND CAPACITY COMPARED TO THE CORRESPONDING CONVENTIONAL WALL SYSTEMS. THEREFORE, THIS PAPER PRESENTS AND DISCUSSES THE LITERATURE OF RESEARCHES THAT PARTICULARLY CONCERNING THIS TYPE OF COMPOSITE WALL SYSTEM (TSCWS). THE REVIEW INCLUDES 80 PAPERS, WHICH WERE NUMERICALLY, EXPERIMENTALLY, AND ANALYTICALLY INVESTIGATED THE PERFORMANCE OF TSCWS. THESE INVESTIGATIONS CLASSIFIED TSCWS INTO TWO DIFFERENT TYPES: TWIN-LAYER FLAT STEEL SHEET COMPOSITE WALL SYSTEMS (TFSCWS) AND TWIN-LAYER PROFILED STEEL-SHEET COMPOSITE WALL SYSTEMS (TPSCWS). THE CLASSIFICATION OF THESE TWO TYPES OF TSCWS WAS BASED ON THE FORM OF THE SHEETING (FLAT AND PROFILED) AS WELL AS ON THE TYPE OF APPLIED LOAD (AXIAL, CYCLIC, IMPACT, LATERAL, THERMAL, OR A COMBINATION OF ANY TWO LOADS). THROUGH THIS CLASSIFICATION, COMPREHENSIVE MAPPING TABLES ON THE STUDY DETAILS, LOADING, FILLER, AND INTERACTION CONCEPT WERE INTRODUCED. FURTHERMORE, THE FINDINGS FROM THIS LITERATURE REVIEW ARE DISCUSSED AND THE RESEARCH GAPS ARE SUMMARIZED FOR EACH TSCW TYPE, INCLUDING THE IMPACT OF PROVIDING AN OPENING ON THE TSCWS PERFORMANCE.
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