摘要
横向分段施工预应力箱梁受拉区的湿接缝混凝土易于开裂,然而对此类结构在实际的使用过程中观测表明,湿接缝混凝土在荷载作用下并未开裂。通过横向分段施工预应力箱梁两种类型的模型试验加载和对应的有限元分析比较,表明当外荷载作用时,横向分段施工预应力混凝土箱梁截面一定存在预应力的重分布作用,即作用在预制结构上的预应力对湿接缝处的混凝土拉应力有贡献,此处混凝土受力有异于普通钢筋混凝土结构,且现有的有限元通用程序尚无法计算此应力重分布值的大小。
In theory,the wet-joint of concrete of the prestressed concrete box girder with transversely segmental construction in the tension zone,the concrete should be easy to crack. However,it showed that the concrete did not crack under the action of the load. By transverse segmental construction of prestressed concrete box girder with two types of model experiments and corresponding FE analysis the results showed that when the external load,there existed stress redistribution in the cross section of presented construction,which could restrain the tensional distortion of the wet-joint,and the acted on the prefabricated structure of the wet-joint was different from ordinary reinforced concrete structures,and the value of the stress redistribution could not be computed by the current FE program.
出处
《四川理工学院学报（自然科学版）》
CAS
2016年第2期61-64,共4页
Journal of Sichuan University of Science & Engineering(Natural Science Edition)
基金
福建省教育厅A类科技项目(JK14374)
