现浇预应力空心板梁楼盖现场试验研究

Full scale experimental study on prestressed concrete hollow cast floorslab

结合某实际工程的现场实验,通过建立精细有限元模型对现浇预应力空心板梁楼盖体系进行了分析.按静力等效原理着重讨论了预应力梁支座截面和跨中截面有效翼缘宽度的合理取值,同时分别对楼板在不同工况下荷载的双向传递进行了研究.试验结果表明,预应力梁的有效翼缘宽度与结构受力的类型密切相关,在预应力等效轴向力作用下的有效翼缘宽度比在预应力等效横向力和等效集中弯矩作用下的有效翼缘宽度大得多;板中预应力的作用会明显改变楼面荷载的双向传递规律.为便于实际应用,还定义了表征双向板荷载分配的参数.

Based on the full scale experiment of an engineering project, the finite element method was applied to analyze the bonded-prestressed plate-beam system. According to the static equivalence discipline, the effective widths of flange of prestressed beam at the sections of mid-span and support were evaluated. A series of structural static tests in field were carried out to study the bidirectional load distribution when different load cases were applied to the structure. The results show that the effective width of flange is related to the types of load acting on the structures and it＇s larger due to the equivalent axis force than that due to the combination of equivalent transverse force and the equivalent concentrated moment. The load transfer behavior in floorslab varies evidently due to the application of prestress in beam and slab. To make it easy to use, the parameter in token of the load transfer behavior was defined.