预应力混凝土钢管桁架叠合底板受力性能研究

Study on mechanical behavior of prestressed concrete steel tube truss composite slab

为研究预应力混凝土钢管桁架叠合底板受力性能及各个结构要素对预应力混凝土钢管桁架叠合底板整体受力性能的影响,采用ABAQUS有限元软件建立模型并对数据进行分析,计算得出叠合底板试件的荷载-跨中挠度曲线关系,并将有限元计算的数据与既有试验数据进行了对比.发现有限元软件计算模拟的荷载-跨中挠度曲线关系变化与试验测得数据基本一致,在此基础上,研究了钢管直径、钢管壁厚、底板跨度、预应力筋数量、预应力大小、混凝土强度、砂浆强度等因素对预制板承载力的影响.研究结果表明:预应力大小、钢管壁厚、预应力筋数量、灌浆料强度、叠合板跨度对叠合板承载力影响较大,混凝土强度对叠合板承载力影响较小.

In order to study the mechanical performance of the composite floor of prestressed concrete-filled steel tube truss and the influence of various structural elements on the overall mechanical performance of the composite floor of prestressed concrete-filled steel tube truss,the model is established by using ABAQUS finite element software,the data are analyzed,the load midspan deflection curve relationship of the composite floor specimen is calculated,and the finite element calculation data is compared with the existing test data.The results show that the variation of load mid span deflection curve calculated and simulated by finite element software is basically consistent with the experimental data.On this basis,the effects of steel pipe diameter,steel pipe wall thickness,base slab span,number of prestressed reinforcements,prestress size,concrete strength and mortar strength on the bearing capacity of precast slab are studied.The results show that the size of prestress,the wall thickness of steel pipe,the number of prestressed tendons,the strength of grouting material and the span of composite slab have a great influence on the bearing capacity of composite slab,and the strength of concrete has a small influence on the bearing capacity of composite slab.