Nonlinear global design resistance: Case studies of post‐tensioned concrete bridges made of I‐73 and KA‐61 girders

IF 3 3区工程技术 Q2 CONSTRUCTION & BUILDING TECHNOLOGY

Structural Concrete Pub Date : 2024-08-29 DOI:10.1002/suco.202300986

Martin Lipowczan, Lukáš Novák, David Lehký, Drahomír Novák

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引用次数: 0

Abstract

The paper portrays a comprehensive computational procedure for determining the global structural resistances of two existing bridges made of I‐73 and KA‐61 precast post‐tensioned concrete girders using advanced statistical assessment methods in combination with nonlinear fracture mechanics‐based finite element method analysis. Although this combination is a powerful tool for realistic modeling of structures, its practical application is still very time consuming. Therefore, a statistical sampling approach for the determination of the structural design resistance is compared to selected efficient semi‐probabilistic methods based on the estimation of coefficient of variation—estimation of coefficient of variation (ECoV) method according to fib Model Code 2010 and improved approach called Eigen ECoV method. Load‐bearing capacity is determined for the ultimate as well as several serviceability limit states. The sensitivity of the input parameters burdened with uncertainties on the response of the structure is quantified using a sensitivity analysis supported by a surrogate model based on polynomial chaos expansion. The paper shows that the applicability of nonlinear modeling with respect to uncertainties is possible when using these ECoV methods and a surrogate model and can be applied in a routine manner. The shortcomings and advantages of all the used safety design/assessment methods are discussed.

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非线性总体设计阻力：由 I-73 和 KA-61 梁组成的后张法混凝土桥梁案例研究

本文介绍了一种综合计算程序，该程序采用先进的统计评估方法，结合基于非线性断裂力学的有限元方法分析，确定了两座由 I-73 和 KA-61 预制后张法混凝土梁组成的现有桥梁的整体结构抗力。虽然这种组合是建立真实结构模型的有力工具，但其实际应用仍然非常耗时。因此，我们将用于确定结构设计阻力的统计抽样方法与基于变异系数估算--变异系数估算（ECoV）方法（根据 fib Model Code 2010 和改进方法 Eigen ECoV 方法）的选定高效半概率方法进行了比较。承载能力是根据极限状态和几种适用性极限状态确定的。使用基于多项式混沌扩展的代用模型支持的敏感性分析，量化了输入参数对结构响应的不确定性的敏感性。论文表明，在使用这些 ECoV 方法和代理模型时，可以对不确定性进行非线性建模，并且可以以常规方式应用。文中还讨论了所有使用的安全设计/评估方法的缺点和优点。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Structural Concrete CONSTRUCTION & BUILDING TECHNOLOGY-ENGINEERING, CIVIL

CiteScore

5.60

自引率

15.60%

发文量

284

审稿时长

3 months

期刊介绍： Structural Concrete, the official journal of the fib, provides conceptual and procedural guidance in the field of concrete construction, and features peer-reviewed papers, keynote research and industry news covering all aspects of the design, construction, performance in service and demolition of concrete structures. Main topics: design, construction, performance in service, conservation (assessment, maintenance, strengthening) and demolition of concrete structures research about the behaviour of concrete structures development of design methods fib Model Code sustainability of concrete structures.