热应变对细长预应力混凝土梁的影响

IF 3.9 3区 工程技术 Q2 CONSTRUCTION & BUILDING TECHNOLOGY
Gonzalo Ruano, Virginia Quintana, Armando La Scala, Dora Foti
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引用次数: 0

摘要

在建筑领域,预应力混凝土梁是常用的,即使在普通建筑中;因此,它们暴露于各种风险因素,包括火灾或高热梯度,是相当高的。大量的研究集中在极端荷载条件下的混凝土结构上,但细长的预应力构件在理解机械响应及其数值模拟方面具有独特性和挑战性,特别是关于热梯度和预应力之间的相互作用。事实上,与普通的混凝土梁柱不同,这些结构对温度变化和温度梯度特别敏感。此外,由于热载荷与预先存在的预应力的相互作用,它们的热-机械响应进一步复杂,预应力随时间作为温度场的函数而变化。这项工作通过数值模拟的方法探讨了这种双重行为,包括温度相关的材料特性,重点是热膨胀系数(α)和热瞬态蠕变。使用交错方案有限元建模,分析应用耦合热-机械方法。该模型已在巴里理工学院进行的一系列实验测试中得到验证。比较表明,该模型能够捕捉温度相关应变对这些细长结构的影响。研究结果强调了即使是热性能的微小变化也会影响机械响应,为热负荷下预应力混凝土元件的安全设计提供了必要的见解。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
On the effect of thermal strains in slender prestressed concrete beams

In construction sector, prestressed concrete beams are commonly used, even in ordinary buildings; as a consequence, their exposure to various risk factors, including fires or high thermal gradients, is quite high. Extensive research has focused on concrete structures under extreme loading conditions, but slender prestressed members have proven unique and challenging in the understanding of mechanical response and their numerical modelling, particularly regarding the interaction between thermal gradients and prestressing forces. In fact, unlike ordinary concrete beams and columns, these structures are particularly sensitive to temperature changes and temperature gradients. In addition, their thermo-mechanical response is further complex due to the interaction of thermal loads with pre-existing prestressing stresses, which vary over time as a function of temperature field. This work explores this dual behavior by means of numerical simulations including temperature-dependent material properties, focusing on the thermal expansion coefficient (α) and thermal transient creep. Using a staggered scheme finite element modelling, the analysis applies a coupled thermo-mechanical approach. The model has been validated on a series of experimental tests carried out at Polytechnic of Bari. The comparison showed the model capability to capture the influence of temperature-dependent strains on these slender structures. The results highlight how even minor variations in thermal properties can affect the mechanical response, providing insights essential for the safe design of prestressed concrete elements under thermal loads.

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来源期刊
Materials and Structures
Materials and Structures 工程技术-材料科学:综合
CiteScore
6.40
自引率
7.90%
发文量
222
审稿时长
5.9 months
期刊介绍: Materials and Structures, the flagship publication of the International Union of Laboratories and Experts in Construction Materials, Systems and Structures (RILEM), provides a unique international and interdisciplinary forum for new research findings on the performance of construction materials. A leader in cutting-edge research, the journal is dedicated to the publication of high quality papers examining the fundamental properties of building materials, their characterization and processing techniques, modeling, standardization of test methods, and the application of research results in building and civil engineering. Materials and Structures also publishes comprehensive reports prepared by the RILEM’s technical committees.
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