基于Reissner理论的加强结构绝缘板(FSIP)挠度分析

DEFLECTION ANALYSIS OF FRP REINFORCED STRUCTURAL INSULATED PANELS (FSIP) BASED ON REISSNER'S THEORY

加强结构绝缘板是采用水泥纤维板作为结构面板,粘贴于聚苯乙烯泡沫芯材两侧,并在下面板和芯材之间用碳纤维布加固而形成的夹芯板结构,具有良好的节能环保特性。通过抗弯试验,研究了不同芯材厚度、有无碳纤维布对FSIP板承载力的影响;基于Reissner理论,运用Timoshenko梁理论和复合材料力学公式,修正了夹芯板的中性层位置,并考虑横向剪切效应的影响,提出了在任意集中荷载作用下FSIP板的挠度计算式,并与试验结果进行对比。结果表明:有碳纤维布加强的结构绝缘板,增加芯材厚度可显著提高加强结构绝缘板的抗弯极限承载力,增加结构延性,且挠度理论计算值与试验结果吻合较好。

FRP Reinforced Structural Insulated Panel（ FSIP） is sandwich board structure,which use cement fiberboard as the panel structure,bonded to both sides of polystyrene foam core material,and in between the lower panel and core material formed by strengthened with CFRP. It has advantages of energy conservation and environmental protection. Through the bending experiment,the core material with different thickness were studied,and the influence of carbon fiber cloth on the bearing capacity of FRP Reinforced Structural Insulated Panel（ FSIP）board; based on the Reissner ＇s theory,the paper firstly modified the location of the neutral layer by using Timoshenko beam theory and mechanics of composite materials,and put forward the FSIP deflection calculating formula under arbitrary concentrated load considering transverse shear effect. The results showed that the CFRP reinforced structural insulator and the increase of the thickness of the core material could significantly improve the ultimate bearing capacity of FSIP plate,as well as the structural ductility,the theoretical calculation and experimental results were in good agreement.