高温下钢筋混凝土连续梁的受力性能试验研究

EXPERIMENTAL INVESTIGATION OF BEHAVIOR OF REINFORCED CONCRETE CONTINUOUS BEAMS AT ELEVATED TEMPERATURE

本文介绍6根钢筋混凝土两跨连续梁的高温试验,考察不同加载位置、荷载水平以及单跨或双跨加温等因素下连续梁的变形和内力随温度的变化规律,分析了连续梁的破坏特征和机构等.结果表明,在升温过程中连续梁发生剧烈的内力重分布,塑性铰是一个可变铰,而且可能改变其破坏机构,与常温下具有显著的差异.

In this paper, the behavior of reinforced concrete continuous beams of two spans are investigated at elevated temperature. Six specimens were loaded in different load positions and at different levels and heated in both spans or one span only. From the test results, the general regularities of the deformation and internal forces of continuous beams at elevated temperature have been presented, and the failure modes and mechanism of them have been analysed. It is shown that the internal forces of the continuous beams are rapidly and considerably redistributed at elevated temperature. And the failure mechanism of the specimens differs from that at the room temperature. It is also concluded that the ultimate strengths of the plasticity hinges vary as temperature elevated.