期刊论文

Cao, G.-H.(cgfcivil@163.com)

中文

铁道学报

1001-8360

2013

35

9

107-111

10.3969/j.issn.1001-8360.2013.09.017

12A027:湖南省高等学校科学研究项目

本校为第一且通讯机构

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400 d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700 d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378 d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...

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 prestres...