论文部分内容阅读
进行了3个核心型钢混凝土(CSRC)节点在低周反复荷载作用下的抗震性能试验,研究了核心型钢在节点区的截断锚固形式对试件抗震性能的影响。详细介绍了采用大型通用有限元软件ADINA对CSRC节点试件进行非线性有限元模拟的关键技术,通过该文完成的3个试件对程序进行验证。计算结果表明,该文使用的有限元模型可以合理的反应CSRC节点的受力特征,计算所得的材料应力状态、混凝土裂缝发展趋势和试件骨架曲线等结果与试验吻合良好。在此基础上分析了核心型钢在节点区的锚固构造、混凝土强度和强节点系数等参数对CSRC节点性能的影响。参数分析表明:强节点系数降低,试件强度增加,但变形能力减小。核心型钢在节点区的锚固面积增加,试件强度和变形能力增加。该文成果可为CSRC结构的工程实践提供参考。
The seismic performance tests of three core steel reinforced concrete (CSRC) joints subjected to low cycle reversed loading were carried out. The influence of truncated anchorage forms of core steel on the seismic performance of specimens was studied. In this paper, the key technologies of non-linear finite element simulation of CSRC joints using ADINA, a large-scale general finite element software, are introduced in detail. The program is verified by three specimens completed in this paper. The calculation results show that the finite element model used in this paper can reasonably reflect the stress characteristics of CSRC joints. The calculated stress state, the development trend of concrete cracks and the skeleton curves of specimens are in good agreement with the experimental results. Based on this, the influence of anchoring structure, strength of concrete and strong nodal parameters on the performance of CSRC nodes are analyzed. Parametric analysis shows that the strong nodal coefficient decreases, the strength of the specimen increases, but the deformation capacity decreases. The anchorage area of core steel in the node area increased, and the strength and deformation capacity of the specimen increased. The results of this paper can provide reference for engineering practice of CSRC structure.