|Table of Contents|

Investigation of Construction Quality Evaluating Indices in PC Continuous Box-girder(PDF)

《建筑科学与工程学报》[ISSN:1673-2049/CN:61-1442/TU]

Issue:
2009年03期
Page:
42-48
Research Field:
Publishing date:
2009-09-20

Info

Title:
Investigation of Construction Quality Evaluating Indices in PC Continuous Box-girder
Author(s):
WU Wen-qing1;  CHEN Xiao-gang2;  LI Bo1;  XIE Qun-hua1
1. School of Transportation, Southeast University, Nanjing 210096, Jiangsu, China; 2. Zhejiang Provincial Planning Design & Research Institute of Communications, Hangzhou 310006, Zhejiang, China
Keywords:
bridge engineering;  PC continuous box-girder;  duct grouting;  concrete overweight;  construction quality;  evaluating index
PACS:
U446
DOI:
-
Abstract:
Based on the dismantlement of three prestressed concrete(PC)continuous box-girder bridges, several construction quality evaluating indices for PC box-girder structure were investigated on the spot,which consisted of the duct groutingdensity degree of prestressing bars, concrete overweight percent and concrete protector thickness and so on, and then the indices were analyzed statistically to find out the current construction quality of PC continuous box-girder. The results indicate that the overweight ratio of PC continuous box-girder in China is on the high level generally, it varies between 10% and 20%, and the performance of concrete overweight centres at top slab and low slab of box-girder generally. The duct area percentage of partial grouting for longitudinal prestressing bar is more than 50%, and the percentage for lateral prestressing bar duct grouting is more than 70%, but the performance of duct grouting being noncompacted in a large proportion make the prestressing loss increase obviously. In another side, the true calculating example in the paper indicates that concrete overweight and prestressing loss will enlarge the principal tension stress in PC box-girder, and make the possibility of structure cracking increase. The quantized surveyed indices proposed in the paper is helpful to realize the actual reason for cracking and big flexural down-warping of PC box-girder bridge, and also provide the important basis for structural analysis of PC box-girder.

References:

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Last Update: 2009-09-20