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钢桁架部分或完全嵌入混凝土中构成钢筋混凝土-钢桁架梁(RC-SJ)结构,在某些情况下,可有效替代传统的结构体系。尽管为研究这种结构的抗弯性能做了很多工作,到目前为止,剪切强度仍是一个未解决的问题。该文根据初步试验对RC-SJ梁的剪切响应进行了试验研究和数值分析。对9个试件进行了由剪切破坏引起的倒塌试验。利用ABAQUS软件进行数值模拟,底部钢板采用不同的钢-混凝土接触面。根据试验和数值研究的主要成果,提出一种能够估算这类构件剪切强度的新型分析模型。基础与混凝土之间的黏结最弱时,该模型的试验结果与实际倒塌相符。此外还进行了参数化研究,并利用理论模型对其进行了验证。
The steel trusses are partially or completely embedded in the concrete to form RC-SJ structures, which in some cases can effectively replace the traditional structural systems. Although much work has been done to study the flexural behavior of this structure, shear strength has so far remained an unresolved issue. According to the preliminary experiment, the shear response of RC-SJ beam is studied experimentally and numerically. Nine specimens were subjected to a collapse test caused by shear failure. Using ABAQUS software for numerical simulations, different steel-concrete interfaces were used for the bottom plate. Based on the main results of the experimental and numerical studies, a new analytical model capable of estimating the shear strength of such members is proposed. When the bond between the foundation and the concrete is the weakest, the experimental results of this model are consistent with the actual collapse. In addition, parametric research was conducted and validated using theoretical models.