Experimental and numerical study of the dynamic behaviour of masonry circular arches with non-negligible tensile capacity
Experimental and numerical study of the dynamic behaviour of masonry circular arches with non-negligible tensile capacity
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DOI：
10.2140/jomms.2019.14.621
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发表时间：
2019-12
影响因子：
0.9
通讯作者：
A. Albuerne;A. Pappas;Martin S. Williams;D. D’Ayala
中科院分区：
文献类型：
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作者：
A. Albuerne;A. Pappas;Martin S. Williams;D. D’Ayala
连续拱门和拱顶由具有较低但非零抗拉强度的粘结材料(如罗马混凝土)制成，是历史和纪念性建筑的常见特征，其中许多位于地震多发地区。张拉能力对砖砌穹顶结构动力性能的影响研究较少。本文对跨度为1m的连续圆拱进行了一系列的模型振动台试验，目的是评估抗拉能力对结构形成的影响，评估结构的侧向加速度能力，并将其与voussoir拱的性能进行比较。虽然测试的拱像无张力voussoir拱一样形成了四连杆机构而失败，但连续拱和voussoir拱之间的行为存在显著差异，包括：铰链位置不同；启动摇摆所需的加速度较高；形成铰链所需的材料破裂；铰链一旦形成，无法关闭并移动到不同的位置(活动铰链)。传统的极限分析是一种适用于voussoir拱的分析工具，其基础是抗拉强度为零的假设，但当应用于中等抗拉能力的拱时，这种分析方法是不准确的。实验观测使用商业软件ABAQUS 2017中的非线性有限元ABAQUS/显式动力分析算法进行建模。通过应用混凝土损伤塑性数值材料定律，试验和数值预测得到了很好的一致，支持了坍塌机制的形成，这些机制与无拉伸拱的机制有很大不同。最后，将数值模型扩展到研究跨度为4m的全尺寸拱桥，得到的结果与试验观测结果相符，但与无拉伸voussoir拱桥的观测和模型不符，证明了在评估拱顶结构的动力能力时需要考虑拱顶结构的抗拉能力。
Continuous arches and vaults made of cohesive materials with low but non-zero tensile strength, such as Roman concrete, are a common feature in historic and monumental structures, many of them sited in earthquake-prone regions. The effect of tension capacity on the dynamic behaviour of masonry vaulted structures has scarcely been studied. We describe a series of shaking table tests on model-scale, continuous circular arches of 1m span, with the aims of assessing the effect of tensile capacity on mechanism formation, evaluating the structures' lateral acceleration capacity and comparing their performance to that of voussoir arches. While tested arches fail by forming a four-link mechanism like the no-tension voussoir arch, significant differences in behaviour between continuous and voussoir arches are observed, including: differences in hinge positions; higher accelerations required to initiate rocking; cracking of material required to form hinges; inability of hinges, once formed, to close and move to a different location (travelling hinges). Conventional limit analysis, whose basis includes an assumption of zero tensile strength, is a suitable analytical tool for voussoir arches, but is shown to be inaccurate when applied to arches having a modest tensile capacity. The experimental observations are modelled using non-linear finite elements Abaqus/Explicit dynamic analysis algorithm, from commercial software Abaqus 2017. By applying the Concrete Damage Plasticity numerical material law, good agreement is obtained between the tests and the numerical predictions, supporting the formation of collapse mechanisms that significantly differ from the mechanisms observed for notension arches. Finally, the numerical model is upscaled to study full-size arches with a span of 4m, obtaining results that align with the experimental observations and do not agree with observations and models for the no-tension voussoir arch, evidencing the need to account for tensile capacity of vaulted structures when assessing their dynamic capacity.