EVALUATION RELIABILITY OF INTEGRAL BRIDGE BRIDGE BOX GIRDER WITH PROBABILITY APPROACH
Indonesia is a developing country in construction on roads and bridges, it seen from number highway development. Box girder bridge is a medium span bridge popularly used in urban areas. Bridges design in Indonesia are regulated using nominal loads set at RSNI 2833-201X and SNI 1725. However, in actu...
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| Format: | Theses |
| Language: | Indonesia |
| Online Access: | https://digilib.itb.ac.id/gdl/view/27680 |
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| Institution: | Institut Teknologi Bandung |
| Language: | Indonesia |
| Summary: | Indonesia is a developing country in construction on roads and bridges, it seen from number highway development. Box girder bridge is a medium span bridge popularly used in urban areas. Bridges design in Indonesia are regulated using nominal loads set at RSNI 2833-201X and SNI 1725. However, in actual conditions load and its resistance are random. If in an event the load exceeds the resistance then bridge structure will be failure. Therefore, it is necessary to evaluate probability of failure to each element of structure. <br />
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In this thesis is calculated reliability level of structures on box girder type bridges has been designed using SNI. The reliability is calculated into three important conditions on bridge design ie construction phase, full operational bridge, and condition of bridge affected by earthquake. The evaluation method are first Order Second Moment verified by Monte Carlo Simulation and bridge affected by earthquake with Risk Integral Analysis. <br />
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Result, each structural elements based on design drawings has checked with SNI regulations. Reliability level at stage construction have safety index value 4.1 and reliability level when bridge is fully operated have safety index value 3.8. The level of reliability construction in stage conditions, and fully operational bridge already exceeds average risk target 3.5 determined on AASHTO. Result of calculation risk integral of seismic conditions are done by three variations of compressive strength concrete ie (fc) ̅(average compressive strength), (fc) ̅+0.5 σfc (average compressive strength and halve of deviation), dan (fc) ̅+σfc (average compressive strength and deviation). Result of calculation of percent probability of collapsse 75 years period <br />
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consecutively 0.136%,0.119%, and 0.109%. From improvement of compressive strength concrete, the average failure risk decreased by 11.7%. Hence, average concrete quality can be used in reliability calculation. Reliability on condition of bridge affected by earthquake have safety index 2.99. <br />
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