钢管混凝土叠合柱-RC梁空间节点耐火性能分析
Fire Resistance Analysis of the Space Nodes for CFSTRC Column-RC Beam
张波 1秦笑笑 2徐光朋 3任庆新4
作者信息
- 1. 沈阳建筑大学土木工程学院,辽宁 沈阳 110168;辽宁省交通高等专科学校建筑工程系,辽宁 沈阳 110122
- 2. 沈阳建筑大学土木工程学院,辽宁 沈阳 110168
- 3. 中国建筑第八工程局有限公司东北分公司,辽宁 大连 116021
- 4. 佛山科学技术学院交通与土木建筑学院,广东 佛山 528225
- 折叠
摘要
目的 研究钢管混凝土叠合柱-RC梁空间节点耐火性能,为实际工程提供参考.方法 通过ABAQUS有限元分析软件建立ISO-834 标准火灾下钢管混凝土叠合柱-RC梁空间节点的温度场模型和力学模型;在试验与有限元模拟相吻合的基础上,分析此类构件空间节点的温度场分布、破坏模态、变形和内力分布等工作机理.结果 由于梁板的保护作用,节点区温度远低于非节点区;当梁、柱火灾荷载比相同,梁由2 根增加至3 根、4 根时,空间节点耐火极限分别降低了41.58%和43.75%;高温和轴向荷载的共同作用下,内部钢管混凝土承担内力从常温的 43.27%增加至180 min的52.9%.结论 钢管混凝土叠合柱-RC梁空间节点具有较好的耐火性能,能够满足实际工程中对耐火性能的要求.
Abstract
To investigate the fire resistance of CFSTRC column-RC beam space nodes and provide a reference for practical engineering.The ABAQUS software was used to establish temperature and mechanical field models of CFSTRC column-RC beam space nodes under ISO-834 standard fire.On the basis of the results from test and FEA are in good agreement,the working mechanism of the temperature field distribution,failure mode,deformation and internal force distribution of these members'spatial nodes were analyzed.The CFSTRC column-RC beam temperature at the beam-column joint regions is well below the temperature at the non-joint regions due to the protection of the beam-slab.The fire resistance limit of the joint nodes decreases by 41.58%and 43.75%under the same load ratio of beam and column when the beam increases from 2 to 3 and 4.The core concrete filled steel tube with axial force increases from 43.27%room temperature to 52.9%at 180 min under high temperature and axial compression.CFSTRC column-RC beam space nodes have good fire resistance,which can meet engineering requirements.
关键词
钢管混凝土叠合柱/RC梁/空间节点/工作机理/耐火性能Key words
CFSTRC column/RC beam/space nodes/mechanism/fire resistance引用本文复制引用
基金项目
国家自然科学基金项目(51808351)
沈阳市科学技术计划项目(21-108-9-34)
出版年
2024
NETL
NSTL
万方数据