Gives a bibliographical review of the finite element methods (FEMs) applied for the linear and nonlinear, static and dynamic analyses of basic structural elements from the…
Abstract
Gives a bibliographical review of the finite element methods (FEMs) applied for the linear and nonlinear, static and dynamic analyses of basic structural elements from the theoretical as well as practical points of view. The range of applications of FEMs in this area is wide and cannot be presented in a single paper; therefore aims to give the reader an encyclopaedic view on the subject. The bibliography at the end of the paper contains 2,025 references to papers, conference proceedings and theses/dissertations dealing with the analysis of beams, columns, rods, bars, cables, discs, blades, shafts, membranes, plates and shells that were published in 1992‐1995.
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Presents a review on implementing finite element methods on supercomputers, workstations and PCs and gives main trends in hardware and software developments. An appendix included…
Abstract
Presents a review on implementing finite element methods on supercomputers, workstations and PCs and gives main trends in hardware and software developments. An appendix included at the end of the paper presents a bibliography on the subjects retrospectively to 1985 and approximately 1,100 references are listed.
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K.W. Chau, S.K. Wong, A.Y.T. Leung and C.Y. Yiu
There have been very few empirical studies investigating the value enhancement effects of refurbishment and most rely on cross‐sectional data, which cannot show the before and…
Abstract
There have been very few empirical studies investigating the value enhancement effects of refurbishment and most rely on cross‐sectional data, which cannot show the before and after effects conclusively because of the heterogeneous nature of the properties. The problem of refurbishment is more complicated in buildings or housing estates with multiple‐ownerships, since refurbishment is a collective decision, which can sometimes be difficult to achieve. Uses panel data in Hong Kong to estimate the impact of refurbishment on the market value of properties in a large housing estate. The results show that the refurbishment brought about approximately a 9 per cent increase in the market value of the properties, which far exceeds the cost of refurbishment. Suggests that property owners of a housing estate will benefit if they can reach a collective decision on renovation.
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Mohammad Amin Shahmohammadi, Mojtaba Azhari, Mohammad Mehdi Saadatpour and Saeid Sarrami-Foroushani
This paper aims to analyze the stability of laminated shells subjected to axial loads or external pressure with considering various geometries and boundary conditions. The main…
Abstract
Purpose
This paper aims to analyze the stability of laminated shells subjected to axial loads or external pressure with considering various geometries and boundary conditions. The main aim of the present study is developing an efficient combined method which uses the advantages of different methods, such as finite element method (FEM) and isogeometric analysis (IGA), to achieve multipurpose targets. Two types of material including laminated composite and sandwich functionally graded material are considered.
Design/methodology/approach
A novel type of finite strip method called isogeometric B3-spline finite strip method (IG-SFSM) is used to solve the eigenvalue buckling problem. IG-SFSM uses B3-spline basis functions to interpolate the buckling displacements and mapping operations in the longitudinal direction of the strips, whereas the Lagrangian functions are used in transverse direction. The current presented IG-SFSM is formulated based on the degenerated shell method.
Findings
The buckling behavior of laminated shells is discussed by solving several examples corresponding to shells with various geometries, boundary conditions and material properties. The effects of mechanical and geometrical properties on critical loads of shells are investigated using the related results obtained by IG-SFSM.
Originality/value
This paper shows that the proposed IG-SFSM leads to the critical loads with an approved accuracy comparing with the same examples extracted from the literature. Moreover, it leads to a high level of convergence rate and low cost of solving the stability problems in comparison to the FEM.
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Cong Liang, Eddie Chi Man Hui and Tsz Leung Yip
This paper aims to explore one question: to what extent does urban rehabilitation impact the housing search cost of the low-income tenants.
Abstract
Purpose
This paper aims to explore one question: to what extent does urban rehabilitation impact the housing search cost of the low-income tenants.
Design/methodology/approach
This paper adopts the fixed effects time-on-market (TOM) model and pricing model to study the research question.
Findings
Urban rehabilitation lifts the subdivided units (SDUs’) prices by around 7%. For the SDU located in old districts, urban rehabilitation gives rise to the rental price up by 11%–12%. The SDUs in the area without urban rehabilitation experience a short marketing period of 16%–17%. The SDU located in the old district that is without urban rehabilitation would have a short marketing time.
Originality/value
To the best of the authors’ knowledge, this is the pioneering research to investigate the relationship between rehabilitation and low-income rental housing from the improved search theory. The improved search theory posits that under the circumstance of urban rehabilitation, low-income tenants’ options are limited and the search behavior will be restricted in the affordable areas, and then TOM will be shortened. With the concentration of SDUs in Hong Kong, the test of the search theory is broken down into two hypotheses. (H1) Urban rehabilitation leads to low-income housing prices increase. (H2) Low-income housing located in areas without urban rehabilitation has a shorter TOM.
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Reza Ebrahimi, Mostafa Ghayour and Heshmatallah Mohammad Khanlo
This paper aims to present bifurcation analysis of a magnetically supported coaxial rotor model in auxiliary bearings, which includes gyroscopic moments of disks and geometric…
Abstract
Purpose
This paper aims to present bifurcation analysis of a magnetically supported coaxial rotor model in auxiliary bearings, which includes gyroscopic moments of disks and geometric coupling of the magnetic actuators.
Design/methodology/approach
Ten nonlinear equations of motion were solved using the Runge–Kutta method. The vibration responses were analyzed using dynamic trajectories, power spectra, Poincaré maps, bifurcation diagrams and the maximum Lyapunov exponent. The analysis was carried out for different system parameters, namely, the inner shaft stiffness, inter-rotor bearing stiffness, auxiliary bearing stiffness and disk position.
Findings
It was shown that dynamics of the system could be significantly affected by varying these parameters, so that the system responses displayed a rich variety of nonlinear dynamical phenomena, including quasi-periodicity, chaos and jump. Next, some threshold values were provided with regard to the design of appropriate parameters for this system. Therefore, the proposed work can provide an effective means of gaining insights into the nonlinear dynamics of coaxial rotor–active magnetic bearing systems with auxiliary bearings in the future.
Originality/value
This paper considered the influences of the inner shaft stiffness, inter-rotor bearing stiffness, auxiliary bearing stiffness and disk position on the bifurcation behavior of a magnetically supported coaxial rotor system in auxiliary bearings.
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Chia‐Hau Chen, Chao‐Shi Chen, Ernian Pan, Han‐Chou Tseng and Pao‐Shan Yu
The purpose of this paper is to present special nine‐node quadrilateral elements to discretize the un‐cracked boundary and the inclined surface crack in a transversely isotropic…
Abstract
Purpose
The purpose of this paper is to present special nine‐node quadrilateral elements to discretize the un‐cracked boundary and the inclined surface crack in a transversely isotropic cuboid under a uniform vertical traction along its top and bottom surfaces by a three‐dimensional (3D) boundary element method (BEM) formulation. The mixed‐mode stress intensity factors (SIFs), KI, KII and KIII, are calculated.
Design/methodology/approach
A 3D dual‐BEM or single‐domain BEM is employed to solve the fracture problems in a linear anisotropic elastic cuboid. The transversely isotropic plane has an arbitrary orientation, and the crack surface is along an inclined plane. The mixed 3D SIFs are evaluated by using the asymptotical relation between the SIFs and the relative crack opening displacements.
Findings
Numerical results show clearly the influence of the material and crack orientations on the mixed‐mode SIFs. For comparison, the mode‐I SIF when a horizontal rectangular crack is embedded entirely within the cuboid is calculated also. It is observed that the SIF values along the crack front are larger when the crack is closer to the surface of the cuboid than those when the crack is far away from the surface.
Research limitations/implications
The FORTRAN program developed is limited to regular surface cracks which can be discretized by the quadrilateral shape function; it is not very efficient and suitable for irregular crack shapes.
Practical implications
The evaluation of the 3D mixed‐mode SIFs in the transversely isotropic material may have direct practical applications. The SIFs have been used in engineering design to obtain the safety factor of the elastic structures.
Originality/value
This is the first time that the special nine‐node quadrilateral shape function has been applied to the boundary containing the crack mouth. The numerical method developed can be applied to the SIF calculation in a finite transversely isotropic cuboid within an inclined surface crack. The computational approach and the results of SIFs are of great value for the modeling and design of anisotropic elastic structures.
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The purpose of this study is to address the research gap about the impact of board and audit committee diversity (gender, ethnicity, age and education) on audit fee by using a…
Abstract
Purpose
The purpose of this study is to address the research gap about the impact of board and audit committee diversity (gender, ethnicity, age and education) on audit fee by using a balanced panel of listed firms in four Asian markets – Hong Kong, India, Malaysia and Singapore. The authors argue that a more diverse board and audit committee with the inclusion of females, international directors and directors of different education levels may act as a more effective and innovative mechanism to monitor and regulate important managerial decision such as audit fee.
Design/methodology/approach
The authors use a two-stage framework to address the endogeneity issue and the random-effects panel model to control for firm heterogeneity on a balanced panel of 200 firms in four Asian regions over 2011–2013 to examine the hypotheses presented in this study.
Findings
The authors find that diversity is a factor determining the level of fees paid to audit firms. A more diverse board and audit committee may demand audit services involving differential effort. Firms with more international directors on board and in audit committee pay a higher fee. In addition, a more educationally diverse board and audit committee also pay a higher fee. In contrast, a significant negative relationship is found between audit committee gender diversity and audit fees, but not between board gender diversity and audit fees, suggesting that a more gender-diverse audit committee asks for less audit effort and pays a lower audit fee.
Research limitations/implications
The findings of this study are based on three years of data from the largest 50 firms in four Asian regions, which limits the generalizability of the results. Like other cross-country studies, the analyses in this study also have problems in controlling for all unobservable factors related to cross-country differences in regulations or institutional environments. Diversity can take other forms, including experience, profession, tenure and marital status which are not a part of this study and lay the foundation for future research.
Practical implications
A firm with a more education-diverse board is more committed to quality monitoring and demands higher audit effort, and consequently, higher fees are paid to audit firms. More educationally diverse board and audit committee exercise more effective monitoring and prefer greater audit effort.
Social implications
Firms with more ethnic-diverse boards and audit committees may demand greater assurance for investor protection and pay higher audit fees. The complementary view of internal and external governance systems suggests more effective monitors may prefer additional protection through the purchase of more audit effort. The findings on education diversity and ethnic diversity are consistent with the argument of the complementary view.
Originality/value
This study highlights the significant impacts of diversity (gender, education and ethnicity) in the financial reporting process.
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P. Ladevèze, L. Arnaud, P. Rouch and C. Blanzé
A new approach called the “variational theory of complex rays” (VTCR) is developed for calculating the vibrations of weakly damped elastic structures in the medium‐frequency…
Abstract
A new approach called the “variational theory of complex rays” (VTCR) is developed for calculating the vibrations of weakly damped elastic structures in the medium‐frequency range. Here, the emphasis is put on the most fundamental aspects. The effective quantities (elastic energy, vibration intensity, etc.) are evaluated after solving a small system of equations which does not derive from a finite element discretization of the structure. Numerical examples related to plates show the appeal and the possibilities of the VTCR.
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C.Y. Yiu and Andrew Y.T. Leung
There have been very few cost‐and‐benefit evaluations of rehabilitation. This paper is a triangulation attempt to evaluate directly the cost‐and‐benefit of rehabilitation works…
Abstract
Purpose
There have been very few cost‐and‐benefit evaluations of rehabilitation. This paper is a triangulation attempt to evaluate directly the cost‐and‐benefit of rehabilitation works without relying on price‐proxy and econometric assumptions.
Design/methodology/approach
Chau et al., in their paper, “Estimating the value enhancement effects of refurbishment” (Facilities, Vol. 21 No. 1/2, 2003) have produced an empirical test by regression on the elevation of property price‐differential after rehabilitation. However, property price is merely a proxy on the improvements of building conditions, and its efficiency in reflecting building quality is subject to some institutional constraints. The estimation is also subject to the validity of econometric assumptions. This paper investigates the improvements directly under 18 assessment criteria of the quality of seven housing blocks in Hong Kong.
Findings
The results show that rehabilitation brings benefits to owners, but that these only marginally outweigh the benefits of redevelopment.
Research limitations/implications
The sample size is small, yet it opens up a new framework for future studies on building performance assessment of rehabilitation.
Practical implications
The study serves as a benchmark for future assessment of rehabilitation works.
Originality/value
The study represents an attempt to evaluate the costs and benefits of rehabilitation using a direct performance assessment approach.