Timber buildings exhibit a number of advantages in terms of carbon reduction, appearance, speed of erection, and seismic performance. Because of this, a developing trend in recent years has been the use of renewable and sustainable wood resources in the construction of high-rise buildings [
1]. Systems commonly used today for multi-story timber buildings include timber-frame braced structures, timber-frame shear-wall structures, cross-laminated timber (CLT) shear-wall structures, top and bottom hybrid timber structures, and concrete-core timber structures [
2]. Examples of such buildings may be readily given. The 18-story, 85.4 m tall Mjøstårnet building in, Brumunddal, Norway, features an internal CLT cylinder system and external glued laminated timber frame supports [
3]. The 18-story, 53 m tall University of British Columbia (UBC) Brock Commons building in Vancouver, British Columbia (BC), Canada, employs a hybrid timber structural system consisting of a glued laminated timber frame with concrete tubes [
4]. The 25-story, 86.6 m tall Ascent building in Milwaukee, Wisconsin (WI), USA, is formed of an upper 19-story timber frame and a lower 6-story concrete frame. In order to fully utilize the advantages of each material, hybrid constructions consisting of both concrete and wood are increasingly commonly used for high-rise timber buildings.
In timber hybrid structural systems, the overall seismic performance is affected by the construction and mechanical characteristics of the floor [
5]. Additionally, CLT floors are used on account of the better structural performance, fire resistance, and stiffness that they exhibit, compared with wood-based structural panel floors [
6,
7,
8,
9]. These advantages derive from the orthogonal laminate lay-ups used for gluing during the production process. Every floor ought to meet the necessary standards for strength and stiffness, as well as serviceability metrics; however, because wood is characterized by low density and a low modulus of elasticity, CLT floors are more prone to vibration than conventional concrete floors [
10,
11,
12], and this affects serviceability. When timber floors are considered for building purposes, special attention must be paid to serviceability under human-induced vibration [
13,
14,
15]; nevertheless, there is currently no established design technique for the serviceability of timber flooring among the building rules that apply in China. In order to achieve serviceability standards by restricting the natural frequency of the floor, methods for evaluating the vibration performance of lightweight floors are currently employed in China and elsewhere. According to Eurocode 5 [
16], the natural frequency of the floor should not be any lower than 8 Hz. In ASIC, it is specified that the natural frequency of lightweight floors must not be lower than 9 Hz [
17]. Finally, the Chinese technical standard for human comfort of floor vibration, JGJ/T 441-2019 [
18], stipulates that the first-order vertical natural frequency for floors with a walking excitation dominant must not be lower than 3 Hz. A number of studies on timber floors have been published in recent years. In field experiments, Jarnerö et al. [
19] found that floor vibration performance was greatly affected by boundary conditions. Huang et al. [
20] used finite element simulation to determine that supporting-beam stiffness is crucial to mitigating floor vibration. Wang et al. [
21] used numerical simulations and experiments to assess and forecast the human-induced vibration of a CLT floor under multi-person loads; they found that the vibration response induced by multiple persons was almost twice as much as that induced by a single person and was more likely to cause discomfort. Lou et al. [
22] suggested a relationship between serviceability and peak floor acceleration; based on this, they suggested a peak acceleration limit for floors subjected to human-induced vibration, with peak acceleration being classified as follows: less than 0.0125 m/s
2 was considered comfortable; between 0.0125 m/s
2 and 0.15 m/s
2 was considered slightly comfortable; between 0.15 m/s
2 and 0.8 m/s
2 was considered uncomfortable; and greater than 0.8 m/s
2 was considered unbearable.
However, many studies have focused on timber hybrid structures with reinforced concrete cores as the lateral resistance system [
23,
24,
25,
26,
27,
28]. For multi-story timber hybrid structures, the core is prone to stiffness concentration and structural torsion and can be replaced by a concrete frame instead of a core, but there are few relevant studies. Meanwhile, studies on the serviceability of CLT floors involving field measurements of human-induced vibration have been relatively rare, both in China and across the world. Given this, this paper takes as its focus an actual timber–concrete hybrid project in which the core was changed to a concrete frame as an example to analyze the overall seismic performance and investigate the dynamic performance and human-induced vibration of a local CLT floor. Serviceability conditions for different configurations of the CLT floor were also analyzed, and design recommendations to enhance the serviceability of the timber floor were proposed in light of the results obtained. The findings presented in this paper provide a practical reference for those engaged in seismic analysis and vibration serviceability of high-rise timber hybrid buildings.