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https://hdl.handle.net/11681/2892
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DC Field | Value | Language |
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dc.contributor.author | Ellingwood, Bruce R. | en_US |
dc.creator | Johns Hopkins University. Department of Civil Engineering | en_US |
dc.creator | Information Technology Laboratory (U.S.) | en_US |
dc.creator | Information Technology Laboratory (U.S.) | en_US |
dc.date.accessioned | 2016-03-15T15:20:26Z | en_US |
dc.date.available | 2016-03-15T15:20:26Z | en_US |
dc.date.issued | 1995-07 | en_US |
dc.identifier.govdoc | Contract Report ITL-95-2 | en_US |
dc.identifier.uri | http://hdl.handle.net/11681/2892 | en_US |
dc.description | Contract Report | en_US |
dc.description.abstract | Event combinations for design or evaluation of navigation structures should be evaluated probabilistically, and design criteria can be developed to be consistent with a level of performance expressed in probabilistic terms. (A.) The probability of a joint occurrence of common loads at their peak values is very small. Thus, when considering what loads should be combined, a significant reduction in the combined load from the sum of nominal design values is appropriate. A principal action-companion action format for combining structural actions is recommended for maintaining uniform reliability. (B.) The illustration of the event combination methodology indicated the following: (1.) The probability of a coincidence of operating loads and earthquake is on the order of 10^-10. (2.) The probability of a coincidence of earthquake and impact is on the order of 10^-15. (3.) The probability of a coincidence of earthquake and flood is on the order of 10^-11. It appears as if combinations of these events are very rare and would not need to be considered in design or evaluation. However, further study of these recommendations would be desirable. (C.) Load combinations for dealing with accidental events should be based on a conditional probability of about 0.01-0.1 that the combined load effect is exceeded, given that an accident occurs. The overall unconditional probability of structural failure using this design approach is estimated to be on the order of 10^-5 /yr or less. (D.) Research should be undertaken to develop a protocol for combining extreme events in design of navigation facilities. | en_US |
dc.description.sponsorship | Prepared for U.S. Army Corps of Engineers, Washington, DC 20314-1000 | en_US |
dc.description.tableofcontents | Table of Contents Preface 1. Introductio 1.1 Review of previous work 1.2 Research objectives and scope 2. Probabilistic models of load processes 2.1 Basic load process models 2.2 Permanent loads · 2.2.1 Dead loads 2.2.2 Temperature and other self-straining effects 2.2.3 Prestressing 2.3 Environmental loads 2.3.1 Snow loads 2.3.2 Wind loads 2.3.3 Earthquake effects 2.3.4 Flood loads 2.4 Operating loads 2.4.1. Hydrostatic loads 2.4.2 Equipment .and hydrodynamic loads 2.4.3 Impact 2.5 Summary 3. Probabilistic basis for event combination analysis 3.1 General considerations 3.2 Fundamental event combination analysis 3.3 Illustration of event combination analysis 4. Recommendations for design 5. Conclusions 6. References ... 111 v 1 1 5 6 6 11 11 11 11 11 11 12 13 17 18 18 19 19 20 22 2 23 31 34 37 38 Table 2. Figure 1. Figure 2. Figure 2. Figure 2. Figure 3. Figure 3.2 List of Tables Statistics of structural load events List of Figures Combination of structural loads Poisson pulse process models of events and loads Upcrossing analysis of time-dependent events Typical seismic hazard curves Event tree for analysis of event combinations Stochastically dependent event occurrences • IV 2 2 7 9 16 2 30 | en_US |
dc.format.extent | 49 pages/8.95 MBs | en_US |
dc.format.medium | PDF/A | en_US |
dc.language.iso | en_US | en_US |
dc.publisher | U.S. Army Engineer Waterways Experiment Station | en_US |
dc.relation | http://acwc.sdp.sirsi.net/client/en_US/search/asset/1035227 | en_US |
dc.relation.ispartofseries | Contract Report (Information Technology Laboratory (U.S.)) ; no. Contract Report ITL-95-2 | en_US |
dc.rights | Approved for public release; distribution is unlimited | en_US |
dc.source | The ERDC Library created this digital resource from scans of the Print Resource | en_US |
dc.subject | Evaluation techniques | en_US |
dc.subject | Event combinations | en_US |
dc.subject | Joint probabilities | en_US |
dc.subject | Navigation structures | en_US |
dc.subject | Hydraulic structures | en_US |
dc.subject | Probabilistic loads | en_US |
dc.subject | Rare events | en_US |
dc.subject | Reliability assessment | en_US |
dc.subject | Risk analysis | en_US |
dc.subject | Structural assessment | en_US |
dc.subject | Structural analysis | en_US |
dc.title | Event combination analysis for design and rehabilitation of U.S. Army Corps of Engineers navigation structures | en_US |
dc.type | Report | en_US |
Appears in Collections: | Contract Report |
Files in This Item:
File | Description | Size | Format | |
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CR-ITL-95-2.pdf | Contract Report ITL-95-2 | 8.95 MB | Adobe PDF | View/Open |