A sensitivity study for the second order reliability-based design model of rubble mound breakwaters

Balas, CE
Ergin, Ayşen
The reliability-based risk assessment and structural design model (REBAD) (Balas, 1998) introduced in this paper, is a worthwhile tool in the preliminary design of maritime structures which are portrayed by vast failure consequences and significant resource expenditures. REBAD model in which the Second-Order Reliability Method (SORM) is utilized together with a cost-optimization algorithm, is implemented to Mersin yacht harbor which is constructed near the city of Mersin located on the Turkish coast of Mediterranean Sea. SORM is established on a more correct approximation of the failure surface than the first-order method. The failure mode probability is predicted by approximating the failure surface by a quadratic surface with the identical curvature at the design point. First, REBAD is implemented to the main breakwater by utilising the Hudson failure function to determine the size of armor units, then failure mode response functions were obtained for the fixed exceedance probability of several damage levels. Combining with the hydraulic model study carried out by Ergin and Ozhan (1994) and REBAD outcome, the trunk section of main breakwater and design functions were determined. The second order reliability-based sensitivity study was also carried out to systematically compare limit state equations of Hudson and Van der Meer.


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A probabilistic model is presented for the assessment of the earthquake insurance rates for important engineering structures, for which the seismic losses could be quite significant. The proposed model is used to estimate the earthquake insurance premiums for the structures taking place in the Bolu Mountain Crossing in the Gumusova-Gerede motorway Section, Turkey. The model requires two types of studies, namely: seismic hazard analysis and estimation of potential damage to structures based on damage probabi...
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An evolving design philosophy for port structures in many seismically active regions reflects the observations that: -The deformations in ground and foundation soils and the corresponding structural deformation and stress states are key design parameters. -Conventional limit equilibrium-based methods are not well suited to evaluating these parameters. -Some residual deformation may be acceptable. Performance-based design is an emerging methodology whose goal is to overcome the limitations present in convent...
An energy-based seismic response evaluation of simple structural systems with simulated ground motions
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In recent years, there has been a strong interest on energy-based design and assessment methods for structural systems. The underlying research has been mostly performed using real ground motion records taken from existing earthquakes worldwide. Results may involve bias due to lack of homogeneity of the available ground motion dataset in terms of magnitudes, source to site distances or soil conditions. In this study,a large set of ground motion records are simulated within a p...
Failure mode response functions in reliability-based design of rubble-mound breakwaters
Ergin, A; Balas, CE (1997-05-30)
The reliability-based model applied in this paper, provides a valuable tool in the design of coastal structures which are characterized by large failure consequences and substantial capital expenditures. Therefore, the implementation of the model to the design of rubble-mound breakwaters has an utmost importance especially in countries such as Turkey, where the use of natural stone for breakwaters is very common due to its economy. The purpose of the present paper is to describe the model by implementing it...
A Study on design of piled raft foundation systems
Sönmez, Nurullah; Ufuk Ergun, Mehmet; Department of Civil Engineering (2013)
Design concepts and load sharing mechanism of piled raft foundations have been studied in this thesis. In the conventional piled foundations, the load transferred only by the piles and the piles are used for the reducing of both total and differential settlements and the contribution of the raft is generally disregarded. In the first part of the thesis, design approaches in the literature have been discussed. In the second part of the thesis, parametric analyses have been conducted for typical foundation in...
Citation Formats
C. Balas and A. Ergin, “A sensitivity study for the second order reliability-based design model of rubble mound breakwaters,” COASTAL ENGINEERING JOURNAL, pp. 57–86, 2000, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/62670.