Vlado Gicev

Goce Delcev University of Štip · Faculty of Computer Science

A two-dimensional (2-D)model of a building supported by a rectangular, flexible foundation embedded in the soil is analyzed.The building, the foundation, and the soil have different physical properties.The building is assumed to belinear,but the soil and the foundation can experience non linear deformations. While the works pent for the development...

It is shown that the damage scenarios for site‐specific building models, responding in highly nonlinear manner to strong earthquake ground‐motion pulses, can be used in real‐time health‐monitoring systems. When it can be shown that such predictions produce robust results and are not sensitive to the details of the complete time history of strong gr...

a b s t r a c t Peaks of transient strains in a layer over semi-infinite half space are amplified by interference during up-and down-propagating waves, and they depend upon the impedance ratio of the layer and of the half space, as well as the wavelength. The amplification of incident motion on the ground surface is usually described in the frequen...

Citation: Abbasgholiha, H.; Gičev, V.; Trifunac, M.D.; Jalali, R.S.; Todorovska, M.I. Collapsing Abstract: The sequence of collapsing stages of buildings during strong earthquake shaking is still a poorly understood phenomenon. This study aims to use numerical simulations to improve our understanding of the sequence of phenomena that accompany the...

We present a simple nonlinear model of a shear-beam building that experiences large nonlinear deformations and collapse when excited by large pulses of strong earthquake ground motion. In this paper, we introduce the model and show that its properties can be selected to be consistent with the damage observed in a seven-story hotel in San Fernando V...

We examine how the decay of high‐frequency amplitudes of Fourier spectra of strong earthquake ground acceleration (described in seismological literature by the slope parameter ) depends on the soil and geological site conditions at the recording stations in the Los Angeles metropolitan area. Then, we introduce a Gedanken numerical experiment, in wh...

An effective approach for calibration of a finite element (FE) model for analysis of existing structure consists of matching the frequencies with measured several fundamental frequencies in the corresponding full-scale structure. Implicit in this approach is the assumption that the response is dominated by the modes and frequencies of the structura...

We study the reduction of peak velocity on the ground surface of a soil valley caused by loss of wave energy by large nonlinear strains and strain localization inside the valley, for excitation by a half-sine P-wave pulse. This study is a follow up to our previous study of out of plane response for excitation by an SH-pulse. In this paper, we consi...

We study how the peak velocity of an SV-wave pulse on the ground surface of a two-dimensional soil valley is reduced by loss of wave energy during large nonlinear response inside the valley. This is a follow-up on our previous studies in which we considered excitation by an SH-pulse and a P-wave pulse. We consider in-plane response for incident ang...

We show how complex, three-dimensional modes of vibration of an irregular building can be identified by ambient vibration measurements. We present two-dimensional cross sections of the three-dimensional mode shapes and describe a measuring strategy for identifying the building properties when the excitation consists of nonstationary microtremors an...

We study the reduction of peak velocity on the ground surface of a soil valley for excitation by an SH half-sine pulse. This reduction is caused by the loss of wave energy during propagation accompanied by large nonlinear strains and strain localizations in the soil medium. Our aim is to find a physically plausible explanation for observed spatial...

A two-dimensional model of a building supported by a rectangular, flexible foundation embedded in the soil is analysed for excitation by an incident SH-wave pulse. The building and foundation are assumed to be linear while the soil can experience nonlinear deformations. Work expanded on the development of nonlinear strains in the soil can consume a...

In this paper we consider application of linear programming in solving optimization problems with constraints. We used the simplex method for finding a maximum of an objective function. This method is applied to a real example. We used the “linprog” function in MatLab for problem solving. We have shown, how to apply simplex method on a real world p...

Seismic microzonation maps for Štip (Macedonia) and its surroundings are presented based on the uniform-hazard-spectrum (UHS) methodology. Such mapping satisfies the guidelines for performance-based design (PBD), which requires specification of two sets of spectral amplitudes—one for which the structure will remain essentially linear, and the other...

A two-dimensional model of a building supported by a rectangular, flexible foundation embedded in the soil is analyzed for excitation by an incident plane P-wave. The building, the foundation, and the soil have different material properties. The building is assumed to be anisotropic and linear, while the soil and the foundation are assumed to be is...

A two-dimensional (2-D) model of a building supported by a rectangular, flexible foundation embedded in the soil is analyzed for excitation by an incident plane SV-wave. The incidence is below the critical angle. The building is assumed to be anisotropic and linear while the soil and the foundation are assumed to be isotropic and can experience non...

Methods to solve variational problems, the tasks for the study for maximum and minimum of functionals are very similar methods to study the maximum and minimum functions. Therefore, appropriate to outline briefly the theory of maximum and minimum functions and in parallel we will introduce similar concepts and prove similar theorems for functional....

A two-dimensional (2-D) model of a building supported by a rectangular, flexible foundation embedded in the soil is analyzed. The building, the foundation, and the soil have different physical properties. The building is assumed to be linear, but the soil and the foundation can experience nonlinear deformations. While the work spent for the develop...

Fourier series represent a very important tool for solving problems in any field of science that uses sinusoidal signals, such as engineering, physics, applied mathematics, and chemistry. Therefore, good understanding of Fourier series is crucial for the process of learning the basics of these scientific fields. The theory of these series is compli...

Variational calculus studied methods for finding maximum and minimum values of functional. It has its inception in 1696 year by Johan Bernoulli with its glorious problem: to find a curve, connecting two points A and B , which does not lie in a vertical, so that heavy point descending on this curve from position A to reach position in for at least t...

Variational calculus studied methods for finding maximum and minimum values of functional. It has its inception in 1696 year by Johan Bernoulli with its glorious problem for the brachistochrone: to find a curve, connecting two points A and B , which does not lie in a vertical, so that heavy point descending on this curve from position A to reach po...

In the past few years, cross-platform programming technology gains importance. Great majority of companies use alternative and more accessible cross-platform technologies in order to gain access to different mobile platforms. This paper is focused on the channels of communication between cross-platform mobile and desktop applications created using...

The Republic of Macedonia has an extensive mining past and presence, related to several polymetallic mineral deposits, which is important for its economy. This paper focuses on efforts we made to organize Microsoft Access database with the most representative data for the across the World well known Alshar polymetallic deposit in the Republic of Ma...

Во овој труд разгледуваме решавање на Neumann проблемот при трансфер на топлина низ прачка. Иницијално прачката е загреана по должина, а на краевите температурата се менува во тек на време. Проблемот се опишува со парцијална диференцијална равенка која ја решаваме нумерички со Crank-Nicolson методот, во случај кога имаме Neumann гранични услови и а...

Fourier series represent a very important tool for solving problems in any field of science that uses sinusoidal signals, such as engineering, physics, applied mathematics, and chemistry. So, good understanding of Fourier series is crucial for the process of learning the basics of these scientific fields. The theory of these series is complicated b...

Within the Republic of Macedonia there are numerous polymetallic mineral deposits important for its economy. This paper focuses on efforts we made to organize Microsoft Access database with the most representative data for the most important Pb-Zn deposit in the Republic of Macedonia, the Sasa deposit and mine near the city of Makedonska Kamenica....

Numerous anthropogenic concentrations (AC) related to past or present metallic mineral resources mining has been determined at the territory of the Republic of Macedonia, but there was not a complete database with information for majority of them. During the past two decades we had collected satisfactory amount of data to organize anthropogenic con...

We study response of a shear beam to seismic excitations at its base. The research is conducted using computer simulation of the wave propagation on a numerical model. The wave equation is solved using the method of finite differences (FD) where the spatial and temporal derivatives are approximated with finite differences. We used formulation of t...

The main objective of this study is to understand the phenomena connected with the interaction and to give directions for improvement of the design of the earthquake resistant structures. Fourier amplitudes (amplitudes versus frequencies) of the foundation motion connected with the soil-structure interaction and differential motions of the foundati...

The wave propagation approach in solving the problem is considered. The wave equation is solved numerically in the domain consisting of the soil, foundation, and superstructure using the explicit Lax-Wendroff numerical scheme. An artificial boundary is incorporated to simulate the Sommerfeld radiation boundary condition at infinity. The velocities...

1 funac et al. 1999b; 2001a,b). Field reconnaissance of the effects of many earthquakes has provided numerous ex-amples of different types of soil failure and permanent deformations caused by strong shaking (Duke 1958; Ka-nai 1983). Examples include settlement of cohesionless soils, liquefaction of saturated sands, flow slides due to liquefaction o...

In this paper we consider one-dimensional (1 - D) problem of heat transfer through the rod. Initially the rod is heated longitudinally and the ends are maintained at zero temperature over time. The problem is governed by a partial differential equation which is solved numerically by Crank-Nicolson method. From the solution it can be seen that as ti...

a b s t r a c t Three variants of a two-dimensional (2-D) model of a building supported by a rectangular, flexible foundation embedded in nonlinear soil are analyzed. The building, the foundation, and soil have different physical properties. The building is assumed to be linear, but the foundation and the soil can experience nonlinear deformations....

Keywords: Nonlinear response of a shear building Strong earthquake pulses Permanent deformations in a shear building Permanent tilts a b s t r a c t Nonlinear waves in a building with bi-linear constitutive law are described for excitation by vertically propagating S-wave pulses. Conditions that lead to the nonlinear deformation are described in te...

We model a seven-story, reinforced-concrete building in Van Nuys, CA, which was damaged during the 1994 Northridge earthquake. We use a one-dimensional, layered, shear-beam model with bi-linear material properties, and we examine how the rotations (local strains and drifts) in this model depend upon the distribution of the stiffness along the build...

Nonlinear waves in a bilinear soil layer are described for excitation by vertically arriving S-wave pulses of strong ground motion. Conditions that lead to the nonlinear deformation are described in terms of amplitudes and wavelengths of in-cident pulses. It is shown that the layer can fail during the first passage of the incident wave (during a ti...

A two-dimensional (2-D) model of a building supported by a semi-circular flexible foundation embedded in nonlinear soil is analyzed. The building, the foundation, and the soil have different physical properties. The model is excited by a half-sine SH wave pulse, which travels toward the foundation. The results show that the spatial distribution of...

The main objective of this study is to understand the phenomena connected with the interaction and to give directions for improvement of the design of the earthquake resistant structures. Fourier amplitudes (amplitudes versus frequencies) of the foundation motion connected with the soil-structure interaction and differential motions of the foundati...

The wave propagation approach in solving the problem is considered. The wave equation is solved numerically in the domain consisting of the soil, foundation, and superstructure using the explicit Lax-Wendroff numerical scheme. An artificial boundary is incorporated to simulate the Sommerfeld radiation boundary condition at infinity. The velocities...

Examples of non-linear wave propagation in an elasto-plastic building are presented for excitation by pulses of strong ground motion characteristic of the near-field shaking near earthquake faults. Conditions that lead to the occurrence of permanent deformations in the building are investigated, and the amplitudes and wavelengths of incident pulses...

We note the limitations of the classical Response Spectrum Method (RSM) for the design of earthquake-resistant structures in the near field of strong earthquakes. The main limitation is that the RSM is based on the largest peak of the relative response and does not consider the duration of strong motion. To illustrate an alternative approach the re...

It is shown that the common response spectrum method for synchronous ground motion can be extended to make it applicable for earthquake response analyses of extended structures experiencing differential out-of-plane ground motion. A relative displacement spectrum for design of first-story columns SDC (T, T T , z, z T , t, d) is defined. In addition...