Progressive collapse resistance of planar prestressed concrete frame with infill walls under corner column failure scenario

Abstract

Infill wall is an important component of the structure. Prestressing is frequently employed in concrete structures to mitigate cracking and deformation. Frames containing both are referred to as prestressed concrete with infill walls (IW-PC) frames, which are employed extensively in civil engineering. Nevertheless, the coupling effect of prestressed tendons and infill walls on the capacity to resist progressive collapse remains uncertain. Furthermore, middle column failure is typically regarded as a potential scenario for progressive collapse. However, in practice, accidental loads such as explosions and impacts are highly probable to act on the corner column. The consequences of corner column failure may be more serious. Therefore, this paper took the IW-PC frame as the research object and adopted the static Pushdown method to investigate its progressive collapse resistance under corner column failure. Based on the beam axial force, the progressive collapse of frames can be categorized into the flexural action (FA) stage, compressive arch action (CAA) stage, mixed action (MA) stage, and catenary action (CA) stage. The effects of infill wall strength, infill wall arrangement, prestressed tendon initial tension, and prestressed tendon area on the progressive collapse resistance of IW-PC frames were revealed by parametric analysis. The results showed that the infill wall and prestressed tendon could improve the progressive collapse resistance.