Xiaojun Fang

The Hong Kong Polytechnic University | PolyU · Department of Civil and Environmental Engineering

Many civil engineering structures are supported by tall slender columns, which are susceptible to seismic excitations. Inspired by the tuned mass damper (TMD) concept, these conventional columns are proposed to be divided into two parts in the present study, i.e. to form a column-in-column (CIC) system, to mitigate seismic induced vibrations of the...

Many civil and mechanical engineering structures can be simplified as double-beam systems, i.e., a primary beam and a secondary beam connected to the primary beam. Many studies have been reported in literature to investigate the vibration characteristics of double-beam systems. Those studies investigated the influences of boundary and connecting co...

Previous researches showed that column-in-column (CIC) system has a favorable performance on controlling the dynamic responses of structures subjected to earthquake ground excitations. However, no study has been conducted to directly assess the static behaviours of this system yet. Since the primary function of a structural column is to resist the...

Damages to bridge piers were repeatedly observed in many previous strong earthquakes, resulting in disruptions to traffic and impairing the functionality of road network. Extensive studies have been carried out to improve the seismic resistance of bridge piers so as to enhance the seismic performances of bridge structures. In a recent study, an inn...

Previous researches showed that the replaceable coupling beam damper (RCBD) can effectively enhance the seismic performance of shear wall structures. However, the extensively studied metallic-type RCBD has poor fatigue performance, while the viscoelastic-type RCBD is sensitive to the loading frequency. To overcome the drawbacks of the RCBD mentione...

Conventional tuned liquid column dampers (TLCDs) can only be used to suppress structural vibrations in horizontal directions. However, in reality, the vibration-induced motion of civil engineering structures normally consists of both vertical and horizontal components. In this study, a TLCD-based vibration control system, which is composed of a pai...

Previous studies showed that the non-conventional tuned mass damper (TMD) with large mass ratio outperforms the traditional one in respect to the structural vibration control efficiency and robustness. The authors recently proposed a novel control system based on the non-conventional TMD concept, namely the column-in-column (CIC) system, which was...

Previous studies have showed that severe earthquake could cause damage to concrete filled steel tube (CFST) column. Although the energy dissipator can be used to improve the seismic performance of the CFST column, its enhancement is limited. Based on a new passive control strategy, the authors recently proposed a novel composite column-in-column (C...

The damped masonry infill wall (DMIW) has been experimentally validated to have the ability to ameliorate the seismic problem caused by the diagonal action of the traditional masonry infill wall (TMIW). To lay the foundation for further structural analysis, a macro-modelling method for predicting the in-plane behaviour of the DMIW is developed. In...

This study proposed and evaluated a novel perforated double-core steel-plate assembled buckling-restrained brace (PDBRB). First, the mechanical properties of the PDBRB were theoretically derived to inform its design. Second, quasi-static tests were carried out on three PDBRB specimens with different configurations and one conventional perforated st...

The replaceable coupling beam damper (RCBD) is widely recognized as an effective device to improve the seismic performances of shear wall structures. However, the extensively studied metallic-type RCBD has poor fatigue performance, while the viscoelastic-type RCBD is sensitive to the loading frequency. To overcome the drawbacks of the RCBDs mention...

Double-beam systems have found many applications in civil and mechanical engineering. Extensive works of research have been conducted on the investigation of double-beam systems in which some have studied the vibration characteristics of general double-beam systems without considering the effect of axial load, whereas others investigated the vibrat...

Considering that the concrete filled steel tubular (CFST) is mainly used as the vertical load-bearing member, in this paper the concept of the tuned mass damper (TMD) system for structural vibration control is introduced to extend the functions of the CFST. In other words, the CFST is converted into a new column-in-column (CIC) system with dual-fun...

Recently, a sliding-type column-in-column (SCIC) system was proposed by the authors to reduce structural response using the TMD concept. The idea of the SCIC design is to split a column into an external and an internal column to form a nonconventional TMD system to control vibrations while not increasing the size nor compromising the load bearing a...

The lead viscoelastic coupling beam damper (LVCBD) effectively works under complex loading condition in engineering application, including shear force, axial force, bending moment or their combined loads. Thus, the performance of LVCBD under complex loading condition has been studied through finite element software ABAQUS. The results indicate that...

Due to the story drifts of a high-rise frame-corewall structure in high seismic intensity region is beyond the limit, the lead-viscoelastic coupling beam damper (LVCBD) is adopted to control structural vibration in the seismic energy dissipating design. Elastic time history analysis under frequent earthquake and inelastic time-history analysis unde...