Failure mechanism of steel arch trusses: Shaking table testing and FEM analysis
Failure mechanism of steel arch trusses: Shaking table testing and FEM analysis
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DOI：
10.1016/j.engstruct.2014.10.013
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发表时间：
2015
影响因子：
5.5
通讯作者：
Q. Han;X. Ying;Yan Lu;Xu Jie;Qiu Zhao
中科院分区：
文献类型：
--
作者：
Q. Han;X. Ying;Yan Lu;Xu Jie;Qiu Zhao
为研究钢拱桁架结构在强震作用下的破坏机理，进行了一系列振动台试验，并对试验结果进行了讨论。采用有限元法分析了支撑形式对结构破坏模式的影响以及累积损伤对构件内力的影响。在位移、加速度、钢应变和结构模型放大系数等方面，将数值模型的计算结果与实验结果进行了比较。结果表明，数值计算结果与实验测量结果吻合较好。在强震作用下，结构累积损伤和塑性变形增加，结构刚度下降，导致结构破坏。结构破坏荷载为0.8 ~ 1.0g，加载后主桁架出现面内反对称变形。试验模型的最大应变比累积损伤模型和理想弹塑性模型的最大应变分别大7-15%和8-26%。增加刚扎筋的数量可以略微提高主桁架的刚度，而使用交叉斜撑可以使主桁架的刚度提高2.9倍。
To study the failure mechanism of steel arch truss structures that are subjected to severe earthquakes, a series of shaking table tests were conducted, and the results are discussed in this paper. Furthermore, the effect of bracing forms on the structure failure mode and the cumulative damage effects on the member internal forces were evaluated using the Finite Element Method (FEM). The results from the numerical model are compared with the experimental measurements in terms of displacement, acceleration, steel strain and amplification factor of the structural model. The comparison shows that the numerical results are significantly consistent with the experimental measurements. Under severe earthquakes, structural cumulative damage and plastic deformation increased, whereas the structure stiffness declined, which leads to structural failure. The failure load of the structure was 0.8–1.0g, and in-plane anti-symmetric deformation was found in the main trusses after loading. The maximum strain in the test model is larger than those in the cumulative damage model and the ideal elasto-plastic model by 7–15% and 8–26%, respectively. Increasing the number of rigid tied bars slightly enhances the stiffness of the main truss, whereas using cross diagonal bracings enhances the stiffness of the main truss by 2.9 times.