Research on brittleness wreck of prestressed concrete box-beams

Journal of Chongqing Jiaotong University(Natural Science) ›› 2005, Vol. 24 ›› Issue (5): 1-4.

Research on brittleness wreck of prestressed concrete box-beams

ZHOU Rui¹ ，ZHOU Zhi-xiang¹ ， SHAO Xiao-kang² ， SONG Lei¹

.Chongqing Jiaotong University, Chongqing 400074, China; 2. Chengdu Traffic Beareu Quality-supervise Department, Sichuan Chengdu 610041,China )

Received:2004-09-22 Revised:2004-10-15 Online:2005-10-15 Published:2015-05-18

预应力砼薄壁箱梁破坏形态研究

周锐¹，周志祥¹，邵小康²，宋雷¹

1.重庆交通学院重庆400074；2．四川省成都市交通局质监站四川成都610041

作者简介:周锐(1977一)，男，四川遂宁市人，硕士生，从事结构工程研究。

Abstract

Abstract: Based on the experiment of a 30m-span prestressed concrete box-beam, the brittleness destroy when load less then high-point one has been analysied. It is suggested that the disadvantaged effect of reaction from the prestressed steel to the box because of the distortion must be numbered in the prestressed concrete box-beam which prestressed steel was placed in the soleplate.And based on this theory, a suggested computationsal formula of the thickness of the safeguard concrete above the prestresse

Key words: featheredge box-beams, brittleness destroy, opposite acting force, the thickness of the concrete above the prepressed steel

摘要： 笔者依据30m跨径预应力砼足尺薄壁箱梁的试验研究，分析了其在尚未达到预期极限荷载下发生脆性破坏的原因，提出对在底板中设置预应力束的薄壁箱形预应力砼结构，应计入预应力束因梁体变形产生反向作用力的不利影响，并据此提出了预应力束上保护层厚度的建议公式

关键词: 薄壁箱梁, 脆性破坏, 反向作用力, 上保护层厚度

CLC Number:

U448.215

ZHOU Rui ，ZHOU Zhi-xiang ， SHAO Xiao-kang ， SONG Lei. Research on brittleness wreck of prestressed concrete box-beams[J]. Journal of Chongqing Jiaotong University(Natural Science), 2005, 24(5): 1-4.

周锐，周志祥，邵小康，宋雷. 预应力砼薄壁箱梁破坏形态研究[J]. 重庆交通大学学报（自然科学版）, 2005, 24(5): 1-4.

[1]	XU Yong-mei, ZHOU Zhi-xiang, SHEN Xiao-jun. Research on clear protective thickness of the concrete under the prestressed steel for thin-wall box-beams [J]. Journal of Chongqing Jiaotong University(Natural Science), 2005, 24(6): 44-47.
[2]	ZHOU Zhi-xiang， RIEN Chao， PENG xinguo， FAN Liang. Research on longitudinal cracks of prestressed concrete box-beams [J]. Journal of Chongqing Jiaotong University(Natural Science), 2005, 24(2): 8-11.