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Alternative liaisons
SURFACE STRUCTURES:DYNAMIC LOADS
Construction methods 958354 Experience gained with the construction and occupancy of buildings on three-dimensional ventilated envelope foundations Yu. M. Goncharov, Soil Mechanics & Foundation Engineering, 31(5), 1995, pp 181-185; translated from: Osnovaniya, Fundamenty i Mekhanika Gruntov, 5, 1994, pp 22-25. Designs and a procedure for the installation of threedimensional ventilated envelop foundations on an intermediate layer are examined for heavily iced high-temperature soils. The dynamics of the temperature regime of ventilated foundation and the temperature regime of the bed soils are analyzed. (Journal summary) 958355 Alternative liaisons L. Russell, New CivilEngineer (NCE), 1136, 1995, pp 16-17. Alternative designs being used for some of the structures on a Swansea road scheme carried out by Edmund NuttaU are described. The designs have resulted from close partnership between client and contractor. The contract involves dualling stretches of the $4067 and A48 in Swansea and included the construction of underpasses, riverside retaining walls, major retaining walls and structures, a new river bridge, footbridges and cycle pass. Design and construction of the underpass and of the reinforced earth retaining wall are described. (P.M.Taylor) 958356 The design of Katse Dam B. Tardieu, International Water Power & Dam Construction, 47(4), 1995, pp 16-20. The geotechnical design and construction of Kats¢ Dam in the Malibamatso Valley, South Africa, is described. Challenges to be overcome in the dam design are discussed. The following aspects are examined: geological formation, arch shape, preformed joints design, dam stability, three-dimensional analysis, reinforcement of the upper brecciated layer, wedge stability, and stress/shear analysis. (P.M.Taylor)
Influence of dynamic loads 958357 Unit-impulse response matrix of unbounded medium by infinitesimal finite-element cell method J. P. Wolf & Chongmin Song, Computer Methods in Applied Mechanics & Engineering, 122(3-4), 1995, pp 251-272. To calculate the unit-impulse response matrix of the unbounded medium, the infinitesimal finite-element cell method based solely on the finite-element formulation and working exclusively in the time domain is developed. A formulation can be derived for acceleration, velocity and displacement unit-impulse response matrices. The method leads to highly accurate results for a vast class of problems, ranging from a one-dimensional spherical cavity to a rectangular foundation embedded in a half-plane. (from Authors) 958358 Identification of hysteredc oscillators under earthquake loading by nonparametric models F. Benedettini, D. Capecchi & F. Vestroni, Journal of Engineering Mechanics - ASCE, 121(5), 1995, pp 606-612. Nonparametric identification techniques are used to process recorded data of nonlinear structural responses and to
405A
represent the constitutive relationship of the structure. Nonparametric models axe investigated, defined by two different descriptions: the first, in which the restoring force is a function of displacement and velocity, is commonly used; and the second, in which the incremental force is a function of force and velocity is less adopted. The ability of the second variable space to better reproduce the behavior of hysteretic oscillators is shown. Approximation of the real restoring function in terms of orthogonal (Chebyshev) polynomials and nonorthognnal polynomials is investigated. Finally, a mixed parametric and nonparametric model that exhibits satisfactory behavior in the case of important hardening and viscous damping is presented. (from Authors) 958359 Energy-bnsed linear damage model for high-intensity seismic loading Y. H. Chai, K. M. Romstad & S. M. Bird, Journal of Structural Engineering - ASCE, 121(5), 1995, pp 857-864. In this paper, experimental verification of an energy-based linear damage model is provided by small-scale tests of steel cantilever beams subjected to large inelastic displacement cycles. Test results support the linear assumption between plastic strain energy and imposed displacement, and the assumption of path independence of response to the ultimate limit state. (from Authors) 958360 Non-stationary random seismic responses of non-uniform beams Jiahao Lin, Guizhen Song, Yong Sun & F. W. Williams, Soil Dynamics & Earthquake Engineering, 14(4), 1995, pp 301306. A direct Ritz method is presented for analysing the responses of non-uniform shear beams subjected to the action of an evolutionary random seismic excitation. Because of the use of a pseudo ground acceleration, time-dependent random responses can conveniently be calculated by solving a set of deterministic equations of motion. These responses include power spectral densities, variances and higher spectral moments of any required responses of the beam. A nonuniform beam example was solved and the time-dependent variances and second spectral moments of both the beam-top displacement and the beam-base shear force are given. The method can also be applied to other continuous elastic structures. (from Authors) 958361 Cyclic behavlour of locally web-stiffened W-shape beams R. M. Korol & M. L. Daali, Canadian Journal of Civil Engineering, 22(1), 1995, pp 121-134. A series of tests on W-shaped beam-to-column connections subjected to quasi-static cyclic loading was conducted to assess their ductility and energy dissipation capabilities. The specimens represent beams in ductile moment resisting frames undergoing alternating lateral loads. The aim of this study was to assess and compare the rotation capacity and energy absorption of locally web-stiffened beams with unstiffened beams. Of direct relevance to seismically designed moment resisting steel frames, the experimental results of this research clearly highlight the superiority of herring-bone style webstiffened specimens over vertically web-stiffened or unstiffened specimens. (Authors) 958362 Transient response of single piles under horizontal excitations Y. K. Cheung, L. G. Tham & Z. X. Lei, Earthquake Engineering & Structural Dynamics, 24(7), 1995, pp 10171038.
Construction methods 958354 Experience gained with the construction and occupancy of buildings on three-dimensional ventilated envelope foundations Yu. M. Goncharov, Soil Mechanics & Foundation Engineering, 31(5), 1995, pp 181-185; translated from: Osnovaniya, Fundamenty i Mekhanika Gruntov, 5, 1994, pp 22-25. Designs and a procedure for the installation of threedimensional ventilated envelop foundations on an intermediate layer are examined for heavily iced high-temperature soils. The dynamics of the temperature regime of ventilated foundation and the temperature regime of the bed soils are analyzed. (Journal summary) 958355 Alternative liaisons L. Russell, New CivilEngineer (NCE), 1136, 1995, pp 16-17. Alternative designs being used for some of the structures on a Swansea road scheme carried out by Edmund NuttaU are described. The designs have resulted from close partnership between client and contractor. The contract involves dualling stretches of the $4067 and A48 in Swansea and included the construction of underpasses, riverside retaining walls, major retaining walls and structures, a new river bridge, footbridges and cycle pass. Design and construction of the underpass and of the reinforced earth retaining wall are described. (P.M.Taylor) 958356 The design of Katse Dam B. Tardieu, International Water Power & Dam Construction, 47(4), 1995, pp 16-20. The geotechnical design and construction of Kats¢ Dam in the Malibamatso Valley, South Africa, is described. Challenges to be overcome in the dam design are discussed. The following aspects are examined: geological formation, arch shape, preformed joints design, dam stability, three-dimensional analysis, reinforcement of the upper brecciated layer, wedge stability, and stress/shear analysis. (P.M.Taylor)
Influence of dynamic loads 958357 Unit-impulse response matrix of unbounded medium by infinitesimal finite-element cell method J. P. Wolf & Chongmin Song, Computer Methods in Applied Mechanics & Engineering, 122(3-4), 1995, pp 251-272. To calculate the unit-impulse response matrix of the unbounded medium, the infinitesimal finite-element cell method based solely on the finite-element formulation and working exclusively in the time domain is developed. A formulation can be derived for acceleration, velocity and displacement unit-impulse response matrices. The method leads to highly accurate results for a vast class of problems, ranging from a one-dimensional spherical cavity to a rectangular foundation embedded in a half-plane. (from Authors) 958358 Identification of hysteredc oscillators under earthquake loading by nonparametric models F. Benedettini, D. Capecchi & F. Vestroni, Journal of Engineering Mechanics - ASCE, 121(5), 1995, pp 606-612. Nonparametric identification techniques are used to process recorded data of nonlinear structural responses and to
405A
represent the constitutive relationship of the structure. Nonparametric models axe investigated, defined by two different descriptions: the first, in which the restoring force is a function of displacement and velocity, is commonly used; and the second, in which the incremental force is a function of force and velocity is less adopted. The ability of the second variable space to better reproduce the behavior of hysteretic oscillators is shown. Approximation of the real restoring function in terms of orthogonal (Chebyshev) polynomials and nonorthognnal polynomials is investigated. Finally, a mixed parametric and nonparametric model that exhibits satisfactory behavior in the case of important hardening and viscous damping is presented. (from Authors) 958359 Energy-bnsed linear damage model for high-intensity seismic loading Y. H. Chai, K. M. Romstad & S. M. Bird, Journal of Structural Engineering - ASCE, 121(5), 1995, pp 857-864. In this paper, experimental verification of an energy-based linear damage model is provided by small-scale tests of steel cantilever beams subjected to large inelastic displacement cycles. Test results support the linear assumption between plastic strain energy and imposed displacement, and the assumption of path independence of response to the ultimate limit state. (from Authors) 958360 Non-stationary random seismic responses of non-uniform beams Jiahao Lin, Guizhen Song, Yong Sun & F. W. Williams, Soil Dynamics & Earthquake Engineering, 14(4), 1995, pp 301306. A direct Ritz method is presented for analysing the responses of non-uniform shear beams subjected to the action of an evolutionary random seismic excitation. Because of the use of a pseudo ground acceleration, time-dependent random responses can conveniently be calculated by solving a set of deterministic equations of motion. These responses include power spectral densities, variances and higher spectral moments of any required responses of the beam. A nonuniform beam example was solved and the time-dependent variances and second spectral moments of both the beam-top displacement and the beam-base shear force are given. The method can also be applied to other continuous elastic structures. (from Authors) 958361 Cyclic behavlour of locally web-stiffened W-shape beams R. M. Korol & M. L. Daali, Canadian Journal of Civil Engineering, 22(1), 1995, pp 121-134. A series of tests on W-shaped beam-to-column connections subjected to quasi-static cyclic loading was conducted to assess their ductility and energy dissipation capabilities. The specimens represent beams in ductile moment resisting frames undergoing alternating lateral loads. The aim of this study was to assess and compare the rotation capacity and energy absorption of locally web-stiffened beams with unstiffened beams. Of direct relevance to seismically designed moment resisting steel frames, the experimental results of this research clearly highlight the superiority of herring-bone style webstiffened specimens over vertically web-stiffened or unstiffened specimens. (Authors) 958362 Transient response of single piles under horizontal excitations Y. K. Cheung, L. G. Tham & Z. X. Lei, Earthquake Engineering & Structural Dynamics, 24(7), 1995, pp 10171038.