带肋薄壁L形钢管混凝土柱温度场研究  

Temperature Distribution Analysis of L-shaped Thin-walled Concrete-filled Steel Tubes with Steel Bar Stiffeners

作　　者：王微微[1] 吕学涛[1] 麻辉[1] 

机构地区：[1]辽宁工程技术大学建筑工程学院,辽宁阜新123000

出　　处：《防灾减灾工程学报》2016年第3期420-424,431,共6页Journal of Disaster Prevention and Mitigation Engineering

基　　金：国家自然科学青年基金项目(51208246);辽宁工程技术大学拔尖人才提升计划项目(20130309)资助

摘　　要：为研究高温下带肋薄壁L形钢管混凝土柱的抗火性能,建立了该类构件的ABAQUS温度场计算模型,并用相关试验结果验证了模型的正确性。采用该模型对所设计构件进行温度场计算,结果表明:构件横截面温度场呈现明显梯度分布,由受火面向截面中心逐渐降低;截面阳角处温度较阴角处更高,且阳角附近高温区域面积较阴角处大;构件内部钢筋温度较受火面呈现明显滞后现象,且中心温度较两端降低幅度更大。分析了受火时间、加劲肋尺寸和构件截面尺寸对构件温度分布的影响,可知随着受火时间的延续,构件各部位温度以不同幅度升高;钢筋加劲肋直径对钢筋温度影响比较明显,但对钢管和混凝土温度影响较小;截面尺寸越大,构件同一位置温度越低。To study the fire resistant behavior of L-shaped concrete-filled steel tubes with steel bar stiffeners under fire, firstly, a finite element model, the predicted temperature distribution of which is in good agreement with the test results, is developed by using ABAQUS. Then, we ob- tain the data of temperature distribution and analyse the results that the temperature decreases along the path from the surfaces to the center of the cross-sections under fire, and the temperature of external corners is higher than that of internal corner and the increase of temperature of steel bars delays drastically, and the temperature of center decreases much more than both ends. Finally the heating time, the cross-sectional dimensions, the diameter of steel bar stiffeners are taken into account. The analysis indicates that as the increase of the heating time, the temperature of tubes, concrete and steel bar stiffeners rises in different speeds, and the larger the crosssection is, the lower the temperature of the cross-section is, however, the diameter of steel bar stiffeners has negligible effect on the temperature of concrete and steel tube, but has marked effects on the temperature of steel bar stiffeners.

关 键 词：标准火灾 带肋L形薄壁钢管混凝土柱 温度场 加劲肋直径 热辐射 

分 类 号：TU352.5[建筑科学—结构工程]