Dynamic Behavior of a Suspended Steel Space Frame-Glass Composite Floor

Zhihao Wang,Buqiao Fan,Youkun Huang,Xin Qi,Xiaoke Li,Agathoklis Giaralis

doi:10.1155/2021/8382585

Abstract

This study investigates the dynamic performance of a large-span suspended steel space frame-glass composite floor (SSSF-GCF). Both the ambient vibration and the human-induced vibration of the floor were experimentally measured to identify vertical dynamic characteristics and evaluate vibration serviceability of the floor. Although vertical dynamic characteristics of the floor based on the global simplified finite element (FE) model of the structure agree well with those identified via experimental modal analysis, the global simplified FE model significantly underestimates vertical vibration amplitudes of the floor due to the coupled effect between two layers. Accordingly, an equivalent local FE model of the floor system was proposed and updated via adjusting the vertical stiffness of the interstory hanging pillars. It is shown that the equivalent local FE model can well predict both the dynamic characteristics and human-induced vibration response of the floor. Finally, the effect of the damping ratio on the acceleration response of the floor was numerically demonstrated with the verified local FE model.

Highlights

IntroductionAdvancements in construction materials and techniques have supported the potential for various large-span composite floors applied in building structures, such as the steeltimber composite floor [1, 2], steel-concrete composite floor [3,4,5], steel-deck composite floor [6, 7], cold-formed steel composite floor [8, 9], steel space frame-concrete slab composite floor [10], and other kinds of hybrid composite floors [11,12,13,14]
Natural Frequencies. is paper pays more attention to the vertical vibration of the floor. erefore, only vertical velocity responses were recorded for each case. e natural frequencies of the floor were directly obtained via fast Fourier transform (FFT)
As a new type of floor system, the suspended steel space frame-glass composite floor (SSSF-GCF) presented in this paper can well satisfy the requirements of large-span space

Summary

Introduction

Advancements in construction materials and techniques have supported the potential for various large-span composite floors applied in building structures, such as the steeltimber composite floor [1, 2], steel-concrete composite floor [3,4,5], steel-deck composite floor [6, 7], cold-formed steel composite floor [8, 9], steel space frame-concrete slab composite floor [10], and other kinds of hybrid composite floors [11,12,13,14] These composite floors have been widely used in gymnasiums [15], offices [16], and airport lounges [17], which may be prone to human-induced vibrations due to their low natural frequencies and low damping ratios [18,19,20]. In contrast to extensive dynamic research on other kinds of composite floors, little attention has been paid to the dynamic performance of the steel-glass composite floor in previous research

Methods

Results

Conclusion