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Steel and Composite Structures
  Volume 35, Number 2, April25 2020, pages 159-169

Structural behavior of sandwich composite wall with truss connectors under compression
Ying Qin, Xin Chen, Xingyu Zhu, Wang Xi and Yuanze Chen

    Sandwich composite wall consists of concrete core attached by two external steel faceplates. It combines the advantage of steel and concrete. The appropriate composite action between steel faceplate and concrete core is achieved by using adequate mechanical connectors. This research studied the compressive behavior of the sandwich composite walls using steel trusses to bond the steel faceplates to concrete infill. Four short specimens with different wall width and thickness of steel faceplate were designed and tested under axial compression. The test results were comprehensively evaluated in terms of failure modes, load versus axial and lateral deformation responses, resistance, stiffness, ductility, strength index, and strain distribution. The test results showed that all specimens exhibited high resistance and good ductility. Truss connectors offer better restraint to walls with thinner faceplates and smaller wall width. In addition, increasing faceplate thickness is more effective in improving the ultimate resistance and axial stiffness of the wall.
Key Words
    sandwich composite; truss connector; compression; structural behavior
Ying Qin: Key Laboratory of Concrete and Prestressed Concrete Structures of Ministry of Education, Southeast University, Nanjing, China;
School of Civil Engineering, Southeast University, Nanjing, China
Xin Chen, Xingyu Zhu, Wang Xi and Yuanze Chen: School of Civil Engineering, Southeast University, Nanjing, China

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