Abstract
A new type of U‐shaped steel‐concrete composite floor is analyzed in detail. The experimental test and finite element analysis of the floor are conducted to study the natural frequency and serviceability characteristics of the new composite floor structure. The natural frequency of the floor is measured under the environmental random vibration stimulating method, and the peak acceleration of the floor is measured under pedestrian‐induced load. The experimental test results show that the U‐shaped steel‐concrete composite floor has better antiseismic behaviors and meet the specified serviceability requirements. The finite element analysis results indicate the constraints have a great impact on the calculation results. The experimental tests and FEM results of the floor are compared based on the modal assurance criterion, and the results are in good agreement. The experimental test acceleration curves demonstrate that the peak values meet the requirements of Chinese specification.
Highlights
To meet the requirement, the U-shaped steel-concrete composite floor system has been invented recently in China to provide a floor system with a desirable long-span capacity and minimum constructional height [11, 12]. e floor structure system is composed of top ribs, bottom ribs, shear keys, a thin plate of the surface layer, and a U-shaped steel plate around the bottom ribs (Figure 1)
Electrical and plumbing conduits can pass through the empty space between the top and bottom ribs, increasing the interior net height or reducing the floor height. e cracking and tensile problems of concrete beam bending large moment can be solved by adding U-shape steel around the bottom ribs, which enhances the span capacity of the U-shaped steelconcrete composite floor structure. e U-shaped steelconcrete composite floor system is suitable for long-span industrial and public buildings and has been applied in many projects [11, 12] (Figure 2)
E natural frequency of the floor structure should be between 4 Hz and 8 Hz according to Code of Design and Construction of Composite Building [26]; the vertical peak acceleration of residences and office buildings, shopping mall and interior gallery should, respectively, not be more than 0.005 g and 0.015 g, where g is the acceleration of gravity
Summary
The U-shaped steel-concrete composite floor system has been invented recently in China to provide a floor system with a desirable long-span capacity and minimum constructional height [11, 12]. e floor structure system is composed of top ribs, bottom ribs, shear keys, a thin plate of the surface layer, and a U-shaped steel plate around the bottom ribs (Figure 1). E U-shaped steelconcrete composite floor system is suitable for long-span industrial and public buildings and has been applied in many projects [11, 12] (Figure 2). A great deal of research on human-induced vibration has been conducted in [16,17,18,19,20,21,22,23], and many countries have published the codes and guidelines for the human-induced vibration of structures. They are suitable for the conventional floor structures. (1) e experimental test of the vertical vibration model of U-shaped steel-concrete composite floor slab was performed by environmental excitation. e pedestrian-induced acceleration test of the floor was carried out under eight kinds of test conditions
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