预应力混凝土连续箱梁病害评估及成因分析

发布时间：2018-07-05 07:06

本文选题：预应力混凝土连续箱梁 + 反弯点　；参考：《铁道建筑》2015年11期

【摘要】：一城市快速路预应力混凝土连续箱梁桥在反弯点附近,腹板竖向开裂,裂缝最大宽度达0.7 mm。对该桥进行了外观检查、无损检测、结构检算及静载试验综合评估,并结合评估结果对病害成因进行了分析。分析结果表明:腹板开裂是由于设计中反弯点处预应力钢筋布置不合理,在反弯点处重心偏高且较集中,造成反弯点附近抗弯、抗裂强度不够。此外,由于桥梁施工工艺欠佳或养护不当造成梁体在反弯点处收缩开裂,并在后期进一步发展。
[Abstract]:The web of a city expressway prestressed concrete continuous box girder bridge cracked vertically near the reverse bending point with a maximum crack width of 0.7 mm. The appearance inspection, nondestructive test, structural check and static load test were carried out for the bridge. The causes of the disease were analyzed in combination with the evaluation results. The analysis results show that the cracking of web plate is due to the unreasonable arrangement of prestressed steel bar at the reverse bending point and the high and concentrated center of gravity at the reverse bending point, which results in the bending resistance near the reverse bending point and the failure strength is not enough. In addition, the beam body shrinks and cracks at the reverse bending point due to poor bridge construction technology or improper maintenance, and further develops in the later stage.
【作者单位】：中国铁道科学研究院铁道建筑研究所;
【分类号】：U445.71

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