缓粘结部分预应力混凝土T梁裂缝宽度的试验研究

Experimental Research on Crack Width of Retard-bonded Partially Prestressed Concrete T-beams

为了研究缓粘结预应力混凝土构件的受力性能和使用性能,采用2种不同的方式制作了缓粘结预应力筋,即采用增强纤维塑料布缠绕的方式和PVC塑料管灌浆的方式,并对3根缓粘结部分预应力混凝土T梁进行了试验研究和理论分析,得到了试验梁在荷载作用下的裂缝发展和分布规律,以及荷载与最大裂缝宽度之间的关系。在试验研究的基础上,结合裂缝宽度的影响因素、试验梁的特性和国家现行标准规范,建立了缓粘结部分预应力混凝土梁最大裂缝宽度的计算公式,且计算结果与试验结果吻合较好。

In order to research mechanical behavior and service property of retard-bonded prestressed concrete members,retard-bonded prestressed strands were made in two ways（the prestressed tendons wrapped with reinforced fiber plastic films and the PVC plastic pipe with grouting）.Experimental research and theoretical analysis of three retard-bonded partially prestressed concrete T-beams were carried out to obtain the crack propagation and distribution pattern as well as the relationship between load and maximum crack width under static loadings.Based on the experiment results,considering the effect factors of crack width,the characteristic of test beams and national current specification,the calculation formulas of the maximum crack width of retard-bonded partially prestressed concrete beams under static loading were proposed,and the calculated results are identical with the test results.