单向面内约束混凝土双向板火灾试验及承载力分析  

FIRE TEST AND LIMIT CARRYING CAPACITY ANALYSIS OF TWO-WAY CONCRETE SLABS WITH UNILATERAL IN-PLANE RESTRAINTS

作　　者：王勇[1,2] 史伟男 王腾焱 袁广林 吕俊利[3] 

机构地区：[1]中国矿业大学深部岩土力学与地下工程国家重点试验室,江苏徐州221008 [2]江苏建筑节能与建造技术协同创新中心,江苏徐州221008 [3]山东建筑大学山东省建筑结构鉴定加固与改造重点实验室,山东济南250101

出　　处：《工程力学》2017年第11期145-157,共13页Engineering Mechanics

基　　金：国家青年自然科学基金项目(51408594);中国博士后科学基金特别项目(2016T90525);中国博士后科学基金项目(2014M560461);中央高校基本科研业务费专项资金项目(2014QNA78);教育部高等学校博士学科点专项科研基金项目(20120095110027);江苏建筑节能与建造技术协同创新中心项目(SJXTQ1614);国家级大学生创新创业训练计划基金项目(201610290008)

摘　　要：为研究混凝土板在面内约束作用下的火灾行为,对1块面内约束混凝土双向板进行了恒载-升温条件下的火灾试验,获得了试验板沿板厚的温度场分布、钢筋温度、板挠度和平面外变形以及板角约束力等规律。基于EC2和ASCE两本构模型,采用五种理论对四块不同面内约束作用下试验板的极限承载力进行对比分析。结果表明:单向面内约束作用时,试验板板顶出现沿约束力方向的平行裂缝;与挠度相比,板在垂直约束力方向的平面内膨胀变形较大且不可忽略;面内约束作用和破坏准则对火灾下混凝土双向板极限承载力有重要影响。To investigate the fire behavior of concrete slabs with in-plane restraints, one fire test was conducted on the full-scale two-way concrete slabs. The testing results included the temperature along the depth, the reinforcement temperature, the vertical and in-plane deflection and constraint reaction forces at the four corners. According to EC2 and ASCE models, the load carrying capacity of four testing slabs with different in-plane restraints was analyzed using five theories. The results showed that the crack parallel to the in-plane restraint force direction was observed on the top surface of the slab. Compared to the out-of-plane deflection, the in-plane deflection perpendicular to the constraint direction was relatively larger and could not be neglected. The in-plane restraint force and failure criterion have an important effect on the limit carrying capacity of the concrete two-way slabs in fire.

关 键 词：混凝土双向板 火灾试验 极限承载力 温度 位移 约束 

分 类 号：TU375.2[建筑科学—结构工程] TU325.5