高温下钢筋混凝土框架的受力性能试验研究

EXPERIMENTAL INEVSTIGATION OF BEHAVIOR OF REINFORCED CONCRETE FRAMES AT ELEVATED TEMPERATURE

通过五榀三面受热的钢筋混凝土门式框架的试验，分析了高温下框架的变形和内力重分布规律、破坏特征以及极限承载力。结果表明，高温下框架结构的塑性铰出现次序、位置，以及破坏机构和极限承载力等与常温下的显著不同。内力在整个升温过程中经历了剧烈且复杂的重分布过程。

In this paper, the behavior of reinforced concrete frames heated on their three surfaces have been investigated. Five specimens were tested, the redundant reactions and the internal forecs were directly measured with the special transducers designed and produced by ourselves, and the main factors, including the level of loads and the stiffness ratio between beam and column, were examined.From the test results, the regularities of the deformation, internal force redistribution, failure modes and ultimate temperatures and loads were analyzed. It is shown that the behavior of these frames at elevated temperature differ from those at room temperature, the order of appearance and positions of plastic hinges, failure modes and ultimate strengths of frames vary as temperature elevated, the internal forces are intensely and intricatel redistributed during heating.