摘要
通过对管芯外侧带有纵向裂缝的PCCP(覫2000mm和覫4000mm)进行实体试验,研究其承载能力及其破坏过程。试验结果表明,对于覫2000mm的PCCP,当试验荷载达到1.4倍的设计开裂荷载时,管壁内侧未出现新的可见裂缝;对于覫4000mm管的试验,加压到1.3倍设计开裂荷载时,管底内侧出现新的纵向裂缝;当继续加载时,管体原有裂缝长度增长加宽,与正常完好管试验的开裂位置一致,并在管顶内侧和承插口附近均出现新裂缝,但没有明显降低管体整体的承载能力,不影响正常使用。
The bearing capacity and failure procedure of prestressed concrete cylinder pipes （PCCP） are studied by prototype testing conducted on PCCP （02000mm and 04000mm）with longitudinal cracks on the outer surface of pipes. The results indicate that there are no visible cracks on the inner surface of 02000mm PCCP when the test loads reach the 1.4 times of design cracking loads. And there are some new longitudinal cracks on the inner surface of 04000ram PCCP bottom when the test loads are applied until reaching the 1.3 times of design cracking loads. With the increasing of the loads, the length of previous cracks goes on growing and extending, and the cracking sites are consistency with that of normal pipe test. And then new cracks are found both on the inner surface of 04000mm pipe top and near the bell and spigot joint, but the overall bearing capacity of pipes would not be reduced, which will not affect the normal use of pipes.
出处
《混凝土与水泥制品》
北大核心
2012年第12期37-40,共4页
China Concrete and Cement Products
基金
国家自然基金项目(50979116)
关键词
预应力钢筒混凝土管(PCCP)
抗裂外压
裂缝
承载能力
Prestressed Concrete Cylinder Pipe （PCCP）
Anti-crake external pressure
Crack
Bearing capacity
