四边简支钢筋混凝土双向板火灾试验研究  

Experimental research of four-edge simple support two-way reinforced concrete slab under fire

作　　者：王滨[1,2] 董毓利[3] 

机构地区：[1]青岛理工大学土木工程学院,山东青岛266033 [2]西安建筑科技大学土木工程学院,陕西西安710055 [3]哈尔滨工业大学土木工程学院,黑龙江哈尔滨150090

出　　处：《建筑结构学报》2009年第6期23-33,共11页Journal of Building Structures

基　　金：国家自然科学基金项目(50578078);国家自然科学基金重大国际合作研究项目(50320120156);大型及重要建筑安全监测预警集成技术研究与示范项目(2006BAJ13B03)

摘　　要：进行了2块四边简支钢筋混凝土双向板足尺试件在恒载-升温工况下的火灾试验。研究了双向板在受火过程中沿板厚混凝土的温度场分布规律、钢筋的温度变化、板平面内外的变形、板边转角随温度的改变情况。试验结果表明,在荷载和温度的耦合作用下,沿板厚存在非线性温度场,板平面外变形比常温下显著增加;四边简支钢筋混凝土双向板具有与常温下不同的破坏模式,裂缝主要出现在板顶的长边跨中、距短边支座1/4处以及角部;在火灾作用下板的荷载传递路径有明显改变。The experiments of two full-scale reinforced concrete slabs with four-edge simple support under the combined effects of constant loading and fire were investigated. The tests were mainly designed to study the distribution of temperature field along the depth of the slab, the temperature changes of the inner steel reinforcement, the out-plane and in-plane deformation, and the rotation on the edges. The experimental results indicate that, under the combined effects of constant loading and fire, non-linear temperature field exists along the depth of the slab. Moreover, the out-plane deformation of the slabs is much larger than that of the slabs under normal temperature. The results also show that the failure patterns of the four-edge simple support slabs are different from those under normal temperature. The cracks are mainly occurred on the top of the slab, such as in the middle of the long span, inside 1/4 span of the short bearings and the comer with the force transferring path changed obviously.

关 键 词：钢筋混凝土双向板 四边简支 火灾试验 温度场 变形 破坏模式 

分 类 号：TU375.2[建筑科学—结构工程] TU317.1