Numerically Evaluation of Dynamic Behavior of Post-Tensioned Concrete Flat Slabs under Free Vibration

Abstract

The objective of this paper is to investigate the dynamic behaviour of post-tensioned concrete flat slabs with different geometries and damping ratios. Four groups of models with different lengths, widths, thicknesses and damping ratios designed according to the AS3600 standard. These were used to determine the influence of each parameter on the vibration serviceability by comparing the control variable method with the reference model. The vibration assessment parameters were used as natural frequency, peak acceleration, and response factor. Both the SCI/CSTR43 standard theoretical calculations method and the Strand7 finite element analysis (FEA) method are used to determine the effect of different geometries and damping ratios on vibration. The feasibility of the Strand7 FEA method for vibration analysis is also assessed by calculating the errors of the two methods. The paper concludes that the Strand7 FEA method is highly accurate and feasible. The span in both directions has a large effect on the natural frequency, and increasing both the slab thickness and the damping ratio are effective methods to improve the vibration serviceability. Based on the research in this paper, recommendations are provided for future vibration design of post-tensioned concrete slabs.

Analytical Evaluation of Natural Frequencies in Hollow-Core Slabs: A PracticalMethodology for Civil Engineering Applications

“…In this way, frequency verification is typically performed using a modal analysis within the Finite Element Method (FEM), which is usually developed using a shell or solid finite element to simulate the modal behavior of the panel, characterized by linear and isotropic properties. However, this very robust and accurate approach leads to a significant computational cost [13,14], which is quite challenging for practical applications.…”

Optimal Dimensions of Post-Tensioned Concrete Cylindrical Walls Using Harmony Search and Ensemble Learning with SHAP

“…On the other hand, post-tensioning in structures is an area where metaheuristic optimization techniques found relatively few applications. The research in the area of structural post-tensioning can be grouped into studies related to beams [32], slabs [33][34][35], experimental studies [33,34,36], and numerical studies [32,[34][35][36]. Elbelbisi et al [32] performed a parametric study of post-tensioned fiber reinforced polymer (FRP) systems.…”

“…Furthermore, strengthening near the supports was shown to be more effective than in the middle of the slab. Tahmasebinia et al [35] investigated post-tensioned concrete flat slabs under dynamic loading. According to finite element analysis, increasing the slab thickness and damping ratio is favorable towards better vibration serviceability.…”