当前位置: X-MOL 学术Mater. Struct. › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
Constitutive stress–strain law for FRP-confined tuff masonry
Materials and Structures ( IF 3.4 ) Pub Date : 2020-05-14 , DOI: 10.1617/s11527-020-01491-y
Antonio Sandoli , Bruno Calderoni

The beneficial effect provided by external Fiber-Reinforced Polymers (FRP) confinement on the compressive behaviour of masonry columns has been widely demonstrated by experimental results. Conversely to FRP-confined concrete, for which some reliable stress–strain theoretical models have been developed, in case of confined masonry any unified model has been yet provided. In this paper, after the elaboration of a database containing experimental results on FRP-wrapped masonry columns tested under axial loads, new design-oriented stress–strain constitutive relationships for FRP-confined masonry are proposed. These laws—which have general validity for whatever confined masonry—were derived from the existing Lam and Teng’s model originally developed for FRP-confined concrete, and here adapted to confined tuff masonry. Two functions rule the shape of theoretical stress–strain curve: a second order parabola defines the elastic behaviour, while a straight-line describes the post-elastic behaviour. The entire axial stress–strain response is completely defined by unconfined masonry mechanical properties, composite material characteristics and by a single unknown parameter. This latter takes into account of the dispersion of experimental data and has been evaluated by means of the regression analyses procedure based on the least-squares optimization criteria. The outputs of the proposed constitutive laws were compared with the experimental results currently available in literature. A good matching is observed between the experimental results and the theoretical predictions in terms of axial stress–strain curves.

中文翻译:

FRP约束凝灰岩砌体的本构应力-应变定律

实验结果广泛证明了外部纤维增强聚合物 (FRP) 限制对砌体柱的压缩行为的有益影响。与 FRP 约束混凝土相反,已经开发了一些可靠的应力应变理论模型,但在约束砌体的情况下,尚未提供任何统一模型。在本文中,在详细阐述了包含在轴向载荷下测试的 FRP 包裹砌体柱的实验结果的数据库后,提出了 FRP 约束砌体的新的面向设计的应力应变本构关系。这些定律——对任何受限砌体都具有普遍适用性——源自现有的 Lam 和 Teng 最初为 FRP 受限混凝土开发的模型,这里适用于受限凝灰岩砌体。两个函数决定了理论应力-应变曲线的形状:二阶抛物线定义了弹性行为,而直线描述了后弹性行为。整个轴向应力应变响应完全由无侧限砌体机械性能、复合材料特性和单个未知参数定义。后者考虑了实验数据的分散性,并通过基于最小二乘优化标准的回归分析程序进行了评估。将所提出的本构律的输出与文献中目前可用的实验结果进行了比较。在轴向应力-应变曲线方面,在实验结果和理论预测之间观察到了良好的匹配。二阶抛物线定义弹性行为,而直线描述后弹性行为。整个轴向应力应变响应完全由无侧限砌体机械性能、复合材料特性和单个未知参数定义。后者考虑了实验数据的分散性,并通过基于最小二乘优化标准的回归分析程序进行了评估。将所提出的本构律的输出与文献中目前可用的实验结果进行了比较。在轴向应力-应变曲线方面,在实验结果和理论预测之间观察到了良好的匹配。二阶抛物线定义弹性行为,而直线描述后弹性行为。整个轴向应力应变响应完全由无侧限砌体机械性能、复合材料特性和单个未知参数定义。后者考虑了实验数据的分散性,并通过基于最小二乘优化标准的回归分析程序进行了评估。将所提出的本构律的输出与文献中目前可用的实验结果进行了比较。在轴向应力-应变曲线方面,在实验结果和理论预测之间观察到了良好的匹配。整个轴向应力应变响应完全由无侧限砌体机械性能、复合材料特性和单个未知参数定义。后者考虑了实验数据的分散性,并通过基于最小二乘优化标准的回归分析程序进行了评估。将所提出的本构律的输出与文献中目前可用的实验结果进行了比较。在轴向应力-应变曲线方面,在实验结果和理论预测之间观察到了良好的匹配。整个轴向应力应变响应完全由无侧限砌体机械性能、复合材料特性和单个未知参数定义。后者考虑了实验数据的分散性,并通过基于最小二乘优化标准的回归分析程序进行了评估。将所提出的本构律的输出与文献中目前可用的实验结果进行了比较。在轴向应力-应变曲线方面,在实验结果和理论预测之间观察到了良好的匹配。后者考虑了实验数据的分散性,并通过基于最小二乘优化标准的回归分析程序进行了评估。将所提出的本构律的输出与文献中目前可用的实验结果进行了比较。在轴向应力-应变曲线方面,在实验结果和理论预测之间观察到了良好的匹配。后者考虑了实验数据的分散性,并通过基于最小二乘优化标准的回归分析程序进行了评估。将所提出的本构律的输出与文献中目前可用的实验结果进行了比较。在轴向应力-应变曲线方面,在实验结果和理论预测之间观察到了良好的匹配。
更新日期:2020-05-14
down
wechat
bug