Wyniki wyszukiwania - BazTech

1

Preliminary evaluation of seismic performance of engineering structures with perform 3D

Li Dongmei

Archives of Civil Engineering

|

2019

|

Vol. 65, nr 4

189--201

EN

This study analyzed the role of PERFORM 3D in the preliminary evaluation of seismic performance of engineering structures. Firstly, PERFORM 3D was briefly introduced, and its material constitutive model and basic model were analyzed. Then, taking a high-rise building project in Yulin, Shaanxi, China, as an example, PERFORM 3D was used to evaluate its seismic performance. After establishing the engineering model, five seismic waves were selected for simulation. The results showed that the maximum values of X-axis inter-story displacement angle and Y-axis displacement angle were 1/500 and 1/360 respectively, which were far less than the standard limit; the overall energy dissipation was good, the damping was small, the overall deformation was good, and the seismic performance was also good. In conclusion, PERFORM 3D has a good performance in the preliminary evaluation of seismic performance of engineering, and it is worth further promotion and application.

2

A new strain based rectangular finite element with drilling rotation for linear and nonlinear analysis

Rebiai C., Belounar L.

Archives of Civil and Mechanical Engineering

|

2013

|

Vol. 13, no. 1

72--81

EN

In this paper a new membrane finite element for linear and materially nonlinear analysis is developed. The displacements field of this element has been developed by the use of the strain based approach, and it is based on the assumed functions for the various components of strain which satisfy the compatibility equation. This rectangular finite element has the three degrees of freedom at each of the four corner nodes (the two translations and the in-plane rotation) and the displacement functions of the developed element satisfy the exact representation of the rigid body modes. For elastoplastic analysis, Von Mises, Tresca and Mohr–Coulomb yield criteria are adopted, and both initial stress and initial strain methods are employed. Numerical experiments in both linear and nonlinear analysis have been conducted to assess accuracy and reliability of the developed element compared to the theoretical results and other membrane finite elements.

3

Effect of mining deformations on stability of transport embankments

Stilger-Szydło E., Tutaj W.

Studia Geotechnica et Mechanica

|

2004

|

Vol. 26, nr 3-4

3-22

PL

Przeprowadzono analizę sprężysto-plastyczną metodą elementów skończonych w płaskim stanie odkształcenia, z uwzględnieniem wzmocnienia podłoży nasypów drogowych na terenach górniczych poduszkami z materiału ziarnistego, zbrojonymi geokratami. W analizie wytrzymałościowej przyjęto zmodyfikowany warunek plastyczności Druckera-Pragera ze wzmocnieniem zależnym od spójności. W rozpatrywanych przykładach wyznaczono wartość obciążenia granicznego przyłożonego w koronie nasypu, stan naprężenia i przemieszczenia oraz zasięgi stref plastycznych w korpusie i podłożu.

EN

The elastoplastic analysis was performed, using the Finite Elements Method, in flat state of strain, including improvement of road embankment subgrades in mining areas using granular cushions reinforced with geogrids. For the purpose of resistance analysis, modified Drucker-Prager condition of plasticity was adopted, where reinforcement depends on the cohesion. In the analysed examples, we determined the limit load value imposed along the embankment top, state of stress and displacement as well as the ranges of plastic zones in the embankment body and subsoil.

4

Elastoplastic model of soft soil

Meyer Z., Kozłowski T.

Studia Geotechnica et Mechanica

|

2003

|

Vol. 25, nr 1-2

91-98

EN

In this paper, we present the analysis of strain modulus and the Poisson coefficient in soils with elastoplastic properties.This analysis was carried out using triaxial apparatus and assuming that material constants are separate for elastic and plastic phases. It was suggested that loading and unloading (to zero) of a soil sample with elastoplastic properties allowed us to calculate elementary plastic and elastic strains and plastic modulus of strain. Knowing the modulus of strain we may estimate the values of the Poisson coefficient which describe elastic and plastic parts of strains.