Probabilistic Analysis of Bearing Capacity of Piles

Cosic M., Susic N., Folic R.: Probabilistic Analysis of Bearing Capacity of Piles (poster)

The poster shows a probabilistic concept for determining the pile bearing capacity, taking into account the variability of CPT test parameters (stochastic simulations) and methodology of calculation according to the requirements of Eurocode 7. Solutions obtained using this approach were compared with those obtained from the static load test (SLT).

Bridges: Nonlinear Analyses, Probability Theory and Optimization Theory

Cosic M., Folic R., Folic B.: Bridges: Nonlinear Analyses, Probability Theory and Optimization Theory (poster)

The poster shows a multidisciplinary approach to the assessment of seismic performances based on the Performance-Based Earthquake Engineering (PBEE), taking into account the multi-criteria optimization theory in analyzing the priority methods for bridge rehabilitation/strengthening. One bridge model was subjected to nonlinear static pushover analyses (NSPA), target displacement analyses using the spectrum capacity method (CSM), vulnerability analyses, and reliability analyses, while for a damaged bridge, in addition to be considered using the above methods, was also analyzed using the VIKOR method of multi-criteria optimization.

Performance-Based Nonlinear Seismic Analysis

Performance-based nonlinear seismic analysis

Cosic M.: Performance-Based Nonlinear Seismic Analysis (presentation)

The presentation shows a part of the developed theoretical formulations and results of numerical analyses conducted in doctoral dissertation, which is defended at the Faculty of Civil Engineering University of Belgrade in 2015. In summary volume presents the research in the field of:

– ground motion records and response spectras,

– research in the field of non-linear responses of frame system that participate in the structural system of frame buildings,

– research in the field of non-linear response of the 3D model of frame buildings,

– research in the field of relations of the 3D model of frame buildings response/seismic demand.

Pile Tests

Cosic M., Folic R., Susic N.: Pile Tests (presentation)

Based on the analysis of a large number of scientific papers, the authors of this presentation show their own classification pile tests. The general classification is conducted using high strain and low strain tests, i.e. tests whose basic purpose is to determine the capacity of piles and tests the purpose of which is to analyze the integrity of piles. The pile capacity and integrity tests are critically analyzed by defining their advantages and disadvantages using in-situ investigations, cost effectiveness, requirements regarding the special education of engineers, the quality of data obtained, complexity of data processing and the quality of the processed end results. The proposed classification of pile capacity and pile integrity tests enables to identify very effectively which is the optimal test type for further geotechnical analysis of structures and which type of test should be used in the phase of geotechnical testing for designing and scientific research.

Seismic Methods

Folic R., Cosic M.: Seismic Methods (presentation)

The authors of the presentation, on the basis of the analysis of several thousand scientific papers, presented their original systematization of nonlinear seismic methods for structural performance analysis, which were developed in the last twenty years. Nonlinear seismic methods are generally classified into two groups: Nonlinear Static Analyses (NSA) and Nonlinear Dynamic Analyses (NDA). The analyses of non linear seismic structural response were classified separately from the target displacement analysis which defines the relationship of the seismic demand and the seismic response. On the other hand, the classification was also conducted depending on whether a nonlinear response of the system is obtained by the implementation of incremental-iterative procedures or by the implementation of semi-iterative and/or semi-incremental procedures. Nonlinear Dynamic Analyses were classified according to the concept of mathematical formulation, i.e. whether they are based on only one dynamic analysis, several dynamic analyses or are solved in combination with other methods. By implementing the conducted systematization and classification of nonlinear seismic methods, on can very efficiently consider which type of method is optimal for structural analysis and which type of method should be taken into account in the phase of preliminary and final analyses in the course of scientific research and professional projects.

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