缓黏结预应力混凝土梁长期受力性能试验研究被引量：2

Experimental Study on Long-term Mechanical Performance of Retard-bonded Prestressed Concrete Beams

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摘要通过4根预应力混凝土梁在均布荷载作用下的长期受力性能试验,对其挠度和应变进行约400d的测试,并对缓黏结预应力混凝土梁与普通预应力混凝土梁的受力性能进行分析比较。考虑混凝土收缩徐变效应的影响,对6根圆形徐变柱进行约700d的长期徐变测试。试验结果表明:缓黏结预应力混凝土梁与普通预应力混凝土梁的挠度、应变实测数据变化规律基本一致。在试验全过程中,缓黏结预应力混凝土梁较普通预应力混凝土梁有较大的挠度、应变实测值,在持荷378d时,矩形、T形缓黏结预应力混凝土梁的挠度实测数据分别较普通预应力混凝土梁的挠度偏大9%、5%。卸载稳定后,矩形、T形缓黏结预应力混凝土梁的挠度实测数据分别较普通预应力混凝土梁的挠度偏大10%、4%,表明缓黏结预应力筋与混凝土之间具有足够的黏结力,具有有黏结预应力混凝土梁的受力特性。 Through long-term mechanical properties tests of 4 prestressed concrete beams under the action of uniformly distributed loads,the deflections and strains were tested for about 400 d,and the bearing performance of retard-bonded prestressed concrete beams were compared with ordinary prestressed concrete beams.Considering the effect of concrete creep and shrinkage,long-term creep of 6 circular creep columns were tested over about 700 d.Test results show as follows：The changing laws of the measured deflections and strains are basically the same between the retard-bonded and ordinary prestressed concrete beams; the measured values of deflections and strains of the retard-bonded prestressed concrete beams are relatively larger than those of the ordinary prestressed concrete beams in the whole test process; when under loading of 378 d,the measured deflections of the retard-bonded prestressed concrete beams with rectangular sections and T-shaped sections are 9％ and 5％ higher than those of the ordinary beams respectively,and after unloading and getting stable,the measured deflections of the retard-bonded prestressed concrete beams with rectangular sections and T-shaped sections are 10％ and 4％ higher than those of the ordinary beams respectively,which proves that the retard-bonded prestressed concrete beams demonstrate sufficient bonding forces between retard-bonded prestressed reinforcements and concrete and possess mechanical characteristics of bonded prestressed concrete beams.

作者曹国辉胡佳星张锴张贤

机构地区湖南城市学院土木工程学院湖南科技大学土木工程学院

出处《铁道学报》 EI CAS CSCD 北大核心 2013年第9期107-111,共5页 Journal of the China Railway Society

基金湖南省高校科研项目(12A027)

关键词缓黏结预应力混凝土梁收缩徐变试验研究 retard-bonded prestressed concrete beam shrinkage and creep experimental study

分类号 TU378.2 [建筑科学—结构工程]