Abstract
At present, the engineering designers generally design and analyze the precast structural models according to the equivalent cast-in-situ principle, and have a vague understanding of non-identical problems. However, these issues cannot be ignored, especially for high-intensity areas. This paper considers the differences of the hysteretic relationship between two typical precast joints and cast-in-situ (RC) joints, and researches the influence of these differences on the seismic response of frame structures. For the monolithic precast joint, the force mechanism was analyzed based on its assembly form, and the differences with the RC joint in the testing phenomena were explained accordingly. The dimensionless hysteresis models of two types of joints were proposed, and the rationality of the monolithic precast joint model was verified according to the existing experimental results. Different performances of joints were realized by assigning the constitutive models calculated from sectional reinforcement to the spring elements of analysis models. Considering two possible performance deficiencies of each type of precast joint separately, a total of seven structural analysis models were formed. Nonlinear static analysis and dynamic time-history analysis methods were adopted to reveal the differences between precast frames and the RC frame in terms of structural capacity curve, displacement response, ductility demands of components and structural residual deformation. The results showed that under strong seismic excitation, the response differences between precast frames and the RC frame were significant, so it is worthwhile to establish nonlinear models suitable for precast frames in seismic analysis. This study is valuable for understanding and distinguishing the nonlinear response of precast frames and traditional RC frames.
Highlights
Precast concrete (PC) buildings have been developing vigorously worldwide in recent years, and have become an alternative to traditional RC buildings [1]
In addition to the increase of the peak response, the vibration amplitude of PCH frame generally increases in the time range. This earthquake ended at 40 s; the RC frame and precast concrete (PCE) frame became static immediately after the earthquake, but the PCH frame still underwent a period of small vibration due to insufficient
Buildings should be in cast to reduce the of serious casualties caused by structural buildings should be cast situintositu reduce the risk of risk serious casualties caused by structural collapse. Such conservative practices have become an obstacle to the development of such conservative practices have become an obstacle to the development of PC buildings
Summary
Precast concrete (PC) buildings have been developing vigorously worldwide in recent years, and have become an alternative to traditional RC buildings [1]. For non-emulated connections, designers hope that through a new material, new technology or a new force mechanism, the nonlinear behaviors of the joint can be distinguished from the RC joint with unique advantages Such a connection generally does not require a large amount of concrete pouring to ensure the reliability. It is a good design idea to place the post-cast area in the beam mid-span to make the beam-column junction which bears complex forces have good integrity (Figure 1a) [7] Such a method is hardly used in recent years due to the inconvenience of fabrication, transportation and hoisting of special-shaped components. For emulated connections, the nonlinear characteristics are always different from those of simulation methods and parameter analysis mostly focused on the precast structure itself [25,26,27].
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