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Reliability of Super-T PSC girders at serviceability limit state stresses across all span ranges

机译：可维护性限制状态压力的超级T PSC梁的可靠性 - 所有跨度范围

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摘要

Reliability assessment gives useful information on the level of performance or adequacy of design rules. There are five standardized Super-T prestressed concrete (PSC) girder sections widely used for bridges in Australia. The Australian standard (AS 5100) requires serviceability limit state criteria of allowable stresses to be met. However, there is not yet an assessment of the performance achieved by these rules. In this study, all potential strand arrangements (more than 50,000) for all Super-T sections, across all feasible span ranges, are assessed. Ten girder-slab bridge decks are analysed; the critical girder in the deck is designed for all possible strand arrangements. Design adequacy is assessed using the annual reliability index. A system reliability analysis is conducted using Ditlevsen bounds to check that none of the four stress limits are exceeded. Generally, it is found that the Super-T girder designs are adequate for most strand arrangements compliant with AS 5100. Further, the reliability varies significantly depending on the selected span, section and strand arrangement. This work informs designers on the reliability performance of Super-T girders designed to AS 5100 and provides background for future revisions of AS 5100.
机译：可靠性评估提供了有关设计规则的性能或充足程度的有用信息。共有五种标准化的超级预应力混凝土（PSC）梁部分广泛用于澳大利亚的桥梁。澳大利亚标准（AS 5100）需要满足允许应力的可维护性限制状态标准。但是，尚未评估这些规则所取得的绩效。在本研究中，评估所有可行跨度范围的所有超级T部分的所有潜在的链排列（超过50,000）。分析了十大梁板桥甲板;甲板中的临界梁设计用于所有可能的钢绞线布置。使用年可靠性指数评估设计充足性。使用DITLEVSEN绑定进行系统可靠性分析，以检查是否超过了四个压力限制。通常，发现超级T梁设计适用于符合5100的大多数股线布置。此外，根据所选择的跨度，截面和股线布置，可靠性显着变化。这项工作可通知设计人员对设计为5100的超级T梁的可靠性性能，并为未来修订为5100，提供背景。

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