RELIABILITY OF BALANCE CANTILEVER BRIDGE USING FRICTION TYPE BASE ISOLATOR
Bridges design need to consider the effects of earthquake, especially in locations such as Jakarta which has high bedrock acceleration. As technology develops, there are elements designed to replace the behavior as if the structure is damaged/melting to improve the performance of the structure, one...
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| Format: | Theses |
| Language: | Indonesia |
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| Online Access: | https://digilib.itb.ac.id/gdl/view/71309 |
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| Institution: | Institut Teknologi Bandung |
| Language: | Indonesia |
| Summary: | Bridges design need to consider the effects of earthquake, especially in locations such as Jakarta which has high bedrock acceleration. As technology develops, there are elements designed to replace the behavior as if the structure is damaged/melting to improve the performance of the structure, one of which is the Friction Pendulum Spring (FPS) base isolator. FPS works elastically using frictional forces and then behaves like a structural member that experiences plasticity when its friction capacity is exceeded and uses its stiffness as a pendulum system due to its geometric shape.
Structural design generally uses the LRFD method, including structures with base isolators. The LRFD approach adjusts the reliability of the structure to a certain load which is generally expressed by a value of ? = 3. Incremental Dynamic Analysis (IDA) is used to obtain the fragility of the structure against earthquake intensity expressed in PGA. The structure is declared to have failed when the load that occurs exceeds the capacity of the structure which the two parameters are random variables. The probability of structural failure within the design life is obtained by performing the integral risk or multiplication between the structural fragility curve and the seismic hazard curve. The sensitivity of the structural capacity is carried out by varying the quality of the bridge both the concrete compressive strength and tensile strength of reinforcement bar.
Based on the integral risk results, the structure has a failure probability of a structure within a service life of 75 years of 1.07×10?5. Variations in the quality of concrete do not have a significant impact on the reliability index. Meanwhile, variations in steel quality have a significant impact on the structure
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