Yao-Peng Liu

Yao-Peng Liu
The Hong Kong Polytechnic University | PolyU · Department of Civil and Environmental Engineering

PhD

About

61
Publications
12,286
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600
Citations
Citations since 2016
39 Research Items
518 Citations
2016201720182019202020212022020406080100
2016201720182019202020212022020406080100
2016201720182019202020212022020406080100
2016201720182019202020212022020406080100

Publications

Publications (61)
Article
To explore the structural performance of axially loaded high-strength concrete-filled square steel tubular (HCFSST) long columns, a total of nine HCFSST specimens with various slenderness ratio (λ) values were experimentally tested and the working mechanism of the column was numerically revealed in this work. Parametric studies were also conducted...
Article
In this paper, a new consistent analytical model is proposed for second-order direct analysis of steel structures with tapered members allowing for both symmetric and asymmetric variations. The proposed model is implemented in a flexibility-based beam-column element with considering initial geometrical imperfections at the element level. To account...
Article
Full-text available
Flexible barrier systems have been widely used to resist falling rocks to protect railways, highways and residential buildings. As one of the important components of the system, steel posts are the supporting structures to maintain the system integrality and should not fail before the failure of other components. Under the impact of falling rocks,...
Article
The high-strength materials are increasingly used in the concrete-filled steel tubular (CFST) column to improve its mechanical behaviors. This study aims to evaluate the fundamental behavior of high-strength concrete-filled high-strength square steel tubular (HCFHSST) long columns under eccentric compression. A series of tests were conducted on ecc...
Article
Conventional co-rotational formulations for geometrically nonlinear analysis are based on the assumption that the finite element is only subjected to nodal loads and as a result, they are not accurate for the elements under distributed member loads. The magnitude and direction of member loads are treated as constant in the global coordinate system,...
Article
Full-text available
In this paper, an improved explicit-implicit precise integration method (EIPIM) is proposed for nonlinear dynamic analysis of structures based on the refined precise integration method (RPIM). The RPIM may face a numerical instability problem when using large time steps while the proposed EIPIM uses an explicit predictor-implicit corrector scheme t...
Article
The main objective of this paper is to validate a finite-element (FE) modelling protocol to simulate thin-walled members for static and dynamic analyses. Arbitrary-shaped cross-sections, including open, closed, and multicellular sections can be efficiently modelled for further advanced study. The framework is thoroughly validated and verified using...
Article
Full-text available
In this paper, a refined precise integration method (RPIM) is proposed for nonlinear dynamic analysis of structures. It extends the conventional precise integration method (PIM) from linear analysis to nonlinear analysis through a novel algorithm to improve the conventional Duhamel integration method for nonhomogeneous parts in nonlinear equations....
Article
Full-text available
Flexible barriers have been widely adopted to mitigate the debris flow disasters. However, the research on the coupled interaction analysis between flexible barriers and debris flows with boulders in front is rarely reported. In this paper, a two-stage coupled modeling technique which can account for the debris mobility, the non-linear behavior of...
Article
Latticed structures are commonly used in transmission towers due to lightweight, fast fabrication, and easy installation, but they generally experience more complicated structural behaviors. The full-scale tests on transmission towers have revealed large discrepancies between the numerical simulation and experimental results because the significant...
Article
In this paper, a new flexibility-based beam-column element allowing the interaction of shear deformation and initial imperfections is proposed. The element is based on Hellinger-Reissner functional with exact force interpolation functions. An extended displacement interpolation based on the curvature and shear strain is adopted to account for shear...
Conference Paper
Single angle members are widely used in lightweight transmission line towers. However, angle members may experience complex behaviors such as flexural, flexural-torsional or lateral-torsional buckling due to unsymmetrical section and eccentric loading. The current design practice is generally based on the effective length method, in which semi-empi...
Article
Single angle members are widely used in transmission line towers due to light weight and easy installation. However, angle members may experience complex behaviors such as flexural, flexural-torsional or lateral-tor-sional buckling due to unsymmetrical section and eccentric loading. The current design practice is generally based on the effective le...
Article
Full-text available
Rock sheds have been widely used to protect against rockfall. Traditionally, a cushion layer is placed on the top of a rock shed to reduce the impact force and dissipate energy. However, heavy cushion layers lead to high dead loads and increased construction costs. This paper discusses the concept of an impact-resilient flexible buffer structure. O...
Article
Special concentrically braced frames (SCBFs) are extensively used in high seismicity regions because of structural efficiency and high ductility for energy dissipation. SCBFs exhibit large inelastic deformation through tensile yielding, buckling and post-buckling behaviors of braces. A simple and accurate model for brace with low computational cost...
Article
The concrete-filled steel tube (CFT) members made of noncompact/slender sections, experiencing complex behaviors such as local buckling, concrete confinement and slippage between the components, have been increasingly used in the practical engineering structures. However, few reliable design methods were available until the latest AISC 360-16, in w...
Article
In the structural stability design using direct analysis method (DM), the member initial geometric imperfections should be explicitly simulated. In current design practices, the imperfection shape is usually assumed as a half-sinusoidal curve. For the design of tapered columns, however, the use of this initial configuration may overestimate the buc...
Conference Paper
Full-text available
In this paper, a new flexibility-based beam-column element, allowing for the interaction of shear effects and initial imperfection, is proposed. The element is formulated with Hellinger-Reissner function and locking-free with exact force interpolation functions. An extended displacement interpolation based on the curvature and shear strain is adopt...
Article
Full-text available
Practical single angle members are mostly subjected to eccentric forces due to the end connections to their legs. Plastic Class 1 and compact Class 2 angle cross-sections are allowed for using their plastic reserves. However, most of the interaction equations in the current design codes are linear whereas the nonlinear equations associated with pla...
Article
Full-text available
A field investigation on the actual protective performance of a flexible rockfall barrier along a mountain road in western China is presented in this paper. The total area of the flexible rockfall barrier under investigation was approximately 20,000 m 2. Five typical failure modes of the flexible rockfall barrier were revealed, including steel post...
Article
The plastic hinge method and the plastic zone method are extensively adopted in displacement-based elements and force-based elements respectively for second-order inelastic analysis. The former enhances the computational efficiency with relatively less accurate results while the latter precisely predicts the structural behavior but generally requir...
Conference Paper
Second-order direct analysis has been used in some regions for reliable analysis and design of steel structures. Currently, the stiffness-based element is widely used with accuracy improved by enforcing equilibrium along mid-span or “stations” along the member length in order to achieve equilibrium which is not guaranteed along an element. In this...
Conference Paper
Full-text available
Mild steel hot-rolled sections are commonly prismatic because of the rolling process with a furnace, but welded sections made from steel plates do not have such a constraint, especially when robotic welding machines are used. The weight saving could be very significant by, say, using wide flanged section at mid-span and a small flanged section at e...
Article
Full-text available
The companion paper proposed an analytical solution for design of flexible rockfall barrier undergoing large deflection. The part one also reported that the elongation of energy dissipating device plays an important role in buffer mechanism of the system. This paper further studies the governing factors on large deflection of flexible barrier syste...
Article
Full-text available
The flexible rockfall barrier system exhibits large deflection and complex contact behaviors such that sophisticated finite element method and full-scale test are widely used to design this kind of structures, which causes inconvenient for most engineers. In this paper, a simple analytical method is proposed for fast evaluation of the performance o...
Article
Full-text available
Long-span roofs are widely used worldwide as they provide large internal spaces without obstructions like columns. In designing long-span roofs, the traditional design method faces many difficulties, such as uncertainty in buckling effective length. The advanced second-order direct analysis (SODA) method for design shows and has many advantages for...
Article
Full-text available
In this paper, a novel co-rotational framework for quadrilateral shell element allowing for the warping effect based on the pure deformational method is proposed for geometrically nonlinear analysis. This new co-rotational framework is essentially an element-independent algorithm which can be combined with any type of quadrilateral shell element. A...
Article
Full-text available
Proposed herein is a novel pure deformational method for triangular shell elements that can decrease the element quantities and simplify the element formulation. This approach has computational advantages over the conventional finite element method for linear and nonlinear problems. In the element level, this method saves time for computing stresse...
Article
Long span roofs are widely used in stadium, shopping mall, public hall, warehouse, airport and so on as they can provide large internal spaces. It is a challenging task to design a long span roof for the structural engineers using traditional linear design method due to uncertainty in the assumption of effective length. Second-order direct analysis...
Article
This paper proposes an efficient numerical analysis technique for static and dynamic analysis of space steel frames by one-element-per-member model, considering material and geometric nonlinearities including P-Δ-δ effects, large global deflections and member deformations. The curved arbitrarily-located-hinge (ALH) beam-column element is developed...
Article
In the past decades, the stiffness-based elements with plastic hinge method and the flexibility-based elements with plastic zone method are widely used for second-order inelastic analysis. The former emphasizes the computational efficiency with relatively less accurate structural responses while the later aims to precisely simulate the structural b...
Article
In this paper, a new flexibility-based beam-column element with member initial imperfection is proposed for direct analysis or second-order inelastic analysis of steel structures. In past decades, the stiffness-based elements gain great successes in handling large deflection problems while the flexibility-based elements play a dominant role in plas...
Article
Full-text available
Transmission towers play an important role in transmitting electricity in a power grid safely and reliably. In traditional design practice, the second-order P-Δ (frame side sway) and P-δ (member curvature) effects and joint effects such as load eccentricities, slippage effects, and semirigid connection are commonly ignored in analysis. Great discre...
Article
The terms “Second-order Analysis” and “Direct Analysis” appear in many modern design codes but many engineers consider this as a method for checking only the second-order sway effect, nonlinear sway moment or a tool for academic research. This perception is incorrect in modern structural design and in fact this old approach is defined only as the s...
Article
A new and advanced beam-column element, namely the curved tapered-three-hinges (TTH) beam-column element, is proposed in this paper. The present element can perform large deformation analysis and explicitly simulate the initial member curvature, which is essential for the second-order direct analysis using one-element-per-member models. Another dis...
Article
This is the part two of the two companion papers, which extends the element formulations and the applications of the curved ALH (Arbitrarily Located Hinge) element to three-dimensional space for direct analysis of the steel frames considering large deflection and inelastic behaviors. A simplified approach assuming the space frame to deform with fin...
Article
This paper, as the first part of the two companion papers, proposes a new and curved beam-column element with arbitrarily-located plastic hinge for second-order inelastic or direct analysis of planar steel frames. Unlike the conventional plastic hinge element which requires two and more elements to capture the locations of plastic hinge along membe...
Article
Since the recent introduction of second-order analysis in codes, engineers begin to realize the advantages of the second-order analysis in enhancing the safety and economy of the design output. The method is especially useful for design of complex structures like the shallow dome where failure is commonly due to snap-through buckling with the colla...
Article
Structures composed of concrete-filled steel hollow sections are widely used to-date due to their structural efficiency and economy. This paper proposes a second-order design method which requires only section capacity check without need of assuming an effective length and using prescriptive formulae in different codes and the shape of the member c...
Article
Robust geometric and material nonlinear analysis of buildings under ultimate loads is a key to success of advanced analysis, performance-based seismic design and progressive collapse analysis. This is the second part of two companion papers about the advanced analysis of hybrid steel and concrete frames allowing for various effects such as initial...
Article
Hybrid frames composed of steel, concrete and composite members are widely used to-date due to their structural efficiency and economy as alternatives to traditional bare steel system, especially in high-rise buildings. However, the present design of this structural form is both inconvenient and inconsistent as it needs several separated design cod...
Article
Full-text available
Before the publication of several new codes for structural design of steel structures in recent years, design of structures is based on the linear analysis and the effective length method, which relies on a nonexistent or erroneous assumption of buckling at undeformed geometry. After the publication of the several codes including the Eurocode-3 (20...
Article
Glass wall supporting systems, comprising of pre-tensioned high strength trusses made from alloy steel bars, behave nonlinearly under wind and other loads. For a proper analysis and design, second-order and large deflection analyses are mandatory as the structural response like stress and deflections are highly dependent on the small movements and...
Article
The advantage of second-order nonlinear analysis lies on its capacity to model actual structural response instead of making assumption on the structural behavior such as the arbitrary assumption of effective length factor. Considering the construction process of a structure, it may become a sway frame from a non-sway frame when a story is added or,...
Article
Most scaffolds are made of tubular members and connected in modular form. This structural form has been widely used in different parts of the world. A newly codified design method called the second-order analysis is employed to predict the buckling loads of 3-dimensional scaffolds. This design approach is based on the new Eurocode-3 (2005) and the...
Article
Pre-tensioned high strength trusses using alloy steel bar are widely used as glass wall supporting systems because of the high degree of transparency. The breakage of glass panes in this type of system occurs occasionally, likely to be due to error in design and analysis in addition to other factors like glass impurity and stress concentration arou...
Article
In design of steel structures including bare steel frames, composite steel-concrete structures and those with walls and slabs, the conventional method considers each member separately and the effective length is then assumed for member resistance check. This involves inconsistency between the analysis method and the design method. The primitive and...
Article
In current practice, the design of composite columns such as concrete-filled and concrete-encased steel columns is a member-based procedure which is based on linear analysis in conjunction with the effective length method, rather than a system-based approach utilizing the concept of advanced analysis. In principle, the advanced analysis can be used...
Article
Nonlinear static (pushover) analysis is an effective and simple tool for evaluating the seismic response of structures and offers an attractive choice for the performance-based design. As such, it has generally been used in modern design due to its practicality. However, the nonlinear plastic design method consumes extensive computational effort fo...
Article
In this paper a total incremental iterative force recovery method suitable to plastic hinge analysis is proposed and it is found that this incremental iteration force recovery procedure has a convergence rate comparable to total secant method. The incremental force recovery manner makes this method be capable of recovering member internal forces an...
Article
Co-rotational formulation is suitable for the incremental-iterative nonlinear analysis of framed structure which can be divided into three stages: the predictor, corrector and error-checking phases. The corrector or force recovery procedure determines the accuracy of the solution while the predictor affects only the convergence speed and direction...
Article
Structural elements with complex geometries, boundary conditions and load patterns cannot be designed against buckling using empirical formulae because of uncertain elastic buckling moments or unknown buckling effective lengths, which are basic parameters for these equations. This article proposes a shell finite element procedure for buckling desig...
Article
The effective length method for flexural (column) buckling has been used for many decades but its use is somewhat limited in various contemporary design codes to moderately slender structures with elastic critical load factor () less than 3 to 5. In pace with the use of higher grade steel in recent years, the influence of buckling in axial buckling...
Article
xxiii, 280 leaves : ill. ; 30 cm. PolyU Library Call No.: [THS] LG51 .H577P CSE 2009 Liu This thesis discusses the findings of a research project on analysis and design of bare and wall-framed steel structures. Extensive numerical examples have been employed to verify the proposed theory. The thesis further proposes an efficient and reliable comput...

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Projects

Projects (4)
Project
To develop direct analysis method for steel structures.
Project
To establish the modern structural design method for tapered sections.