Experimental Investigation on Flexural Behavior of Prestressed Concrete-Filled Steel Box Beam
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摘要: 对8根预应力矩形钢箱混凝土梁进行了试验研究,以探讨预应力矩形钢箱混凝土梁的弯曲性能.主要考察了混凝土强度、钢材强度、预应力度、含钢率及加载模式等的影响,得到了钢板和混凝土应变沿梁高的分布和预应力筋的应力增长情况,研究了钢板局部屈曲对弯曲性能的影响.用纤维模型方法,考虑核心受压混凝土的"套箍"效应,得到了荷载-位移的全过程变化曲线,并与试验结果进行了比较,计算结果与试验值吻合良好.研究表明,预应力矩形钢箱混凝土梁具有良好的弯曲性能,有广阔的工程应用前景.
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关键词:
- 预应力矩形钢箱混凝土梁 /
- 局部屈曲 /
- 核心混凝土 /
- 套箍效应 /
- 弯曲性能
Abstract: An experiment was conducted on 8 prestressed concrete-filled steel box beams to investigate the flexural behavior of prestressed concrete-filled steel box beams.The test parameters include concrete strength,steel strength,prestressing degree,steel ratio and loading pattern.The strain distribution of steel and concrete and the stress increment of prestressed tendons were obtained.The effect of local buckling of steel plate on the flexural behavior of prestressed concrete-filled steel box beams was investigated.By considering the confined effect of compression core concrete,load-deflection curves were gained with the fiber analysis method.The predicted results based on the fiber analysis method were compared with the experimental ones to show an accordance.The research results show that prestressed concrete-filled steel box beams have a good flexural behavior to have a vast application prospect. -
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