Precast concrete structres - characteristics and effects of structural actions at connections

Abstract

This paper presents the fundamental characteristics and specific mechanical behaviors of precast concrete structures under complex working conditions, including external loads and internal volumetric changes such as shrinkage and deformation. The study highlights that the most significant difference between precast and cast-in-place concrete structures lies in the stress-strain behavior at the joints, where displacements, cracking, or failure may occur if the design and construction are not properly executed. Through illustrative examples and references to Eurocode standards, the research clarifies the technical requirements for the design and construction of precast concrete structures, aiming to optimize their application in Vietnam's construction practice. Structural analysis of precast concrete must carefully consider factors such as joint friction, thermal shrinkage, and stress concentration, as these directly affect the overall stability and load-bearing capacity of the system. Therefore, proper technical detailing and treatment at the connections is a key factor in ensuring the performance and long-term durability of precast concrete structures.