摘要：采用钢板蒙皮与玻璃纤维增强复合材料（GFRP）拉挤成型的空心方管芯材组成夹层结构，运用四点弯曲试验方法，开展了钢蒙皮复合材料芯材夹层梁的受弯性能试验，研究了其受力性能情况、跨中上下面板应力分布和跨中挠度。运用换算截面法推导出钢蒙皮复合材料芯材夹层板截面有效抗弯刚度，并采用材料力学理论推导出夹层板跨中挠度计算公式，计算各试件的跨中上下面板应力分布情况和跨中挠度。研究结果表明：当芯材厚度一致时，试件的跨中挠度随着钢板面层厚度的增加而逐渐减小；跨中挠度理论值与试验值吻合较好。
关键词：GFRP；夹层板；换算截面法；跨中挠度
中图分类号：TU399文献标志码：A
Abstract： Sandwich structure consisting of steel and glass fiber reinforced composite （GFRP） core pultruded hollow square tube was proposed. Bending experiment of metal facedcomposite core sandwich beam through using fourpoint bending test method was carried out. The distribution of strain， the midspan deflections and the ultimate failure of the slab were analyzed. The effective bending stiffness of metal facedcomposite core sandwich panel was deduced by transformed section method， and the midspan displacement computational formula was deduced by mechanics of materials theory. The midspan deflections of samples were calculated. The theory results and test results were compared and they fitted well. The study results show that when the thickness of the core is constant， the midspan deflection decreases with increasing thickness of metal faced.
Key words： GFRP； sandwich panel； transformed section method； midspan deflection
0引言
3.3跨中挠度理论值与试验值对比
用换算截面法结合材料力学得到的跨中挠度公式计算出的结果与试验值进行比较，各试件在相同荷载（取60 kN）下跨中挠度对比情况见表3。各试件跨中挠度的理论值与试验值对比如图14所示。
由表3可知，跨中挠度的理论值和试验值较接近，由于试验时试件缺陷和其他不确定性因素，试验得出的跨中挠度值小于理论计算值，理论值偏于保守，这在结构设计中是可行的。4结语
（1）提出了一种以复合材料芯材和钢蒙皮组成的钢蒙皮复合材料芯材夹层结构。
（2）夹层板弯曲时，随着面层厚度的增加，试件的弯曲刚度得到明显提高，减少了跨中挠度。当钢 表3跨中挠度对比
Fig.14Comparisons Between Test and Theory
Results of Midspan Deflections of Specimens板面层厚度从4 mm依次增加至6，8，10 mm时，跨中挠度依次减少了8.4%，15.4%，11.5%。
（3）采用换算截面法进行钢蒙皮复合材料芯材夹层板理论计算，并运用材料力学方法推导了跨中扰度计算公式，理论值和试验值吻合较好。参考文献：
References：[1]朱孝信.舰船新材料的发展[J].船舶工程，1998（1）：4750.
ZHU Xiaoxin.Development of New Shipbuilding Materials[J].Ship Engineering，1998（1）：4750.
[2]HU H，BELOUETTAR S，POTIERFERRY M，et al.A Novel Finite Element for Global and Local Bulking Analysis of Sandwich Beams[J].Composite Structures，2009，90（3）：270278.
[5]HU M F，HU W B.A Study on Composite Honeycomb Sandwich Panel Structure[J].Materials and Design，2008，29（3）：709713.
[6]ALLEN G H.Analysis and Design of Structural Sandwich Panels[M].New York：Pergamon Press，1969.
[7]DAVIES J M.Lightweight Sandwich Construction[M].London：Wiley，2001.
[9]ASTM C3932000，Standard Test Method for Flexural Properties of Sandwich Constructions[S].
QIN Peicheng.Theoretical and Experimental Study on the Bending Behavior of Metal Faced Sandwich Panel[D].Harbin：Harbin Institute of Technology，2011.
SUN Chunfang，XUE Yuande，HU Pei.Mechanical Properties and Test Method for Foam Core Sandwich Structure[J].Fiber Reinforced Plastics/Composite，2005（2）：36.
[13]王海忠，何保康，陶忠.建筑夹芯板结构性能分析[J].钢结构，1999，14（4）：4145.
WANG Haizhong，HE Baokang，TAO Zhong.Structural Behavior Analysis of Architectural Sandwich Panels[J].Steel Construction，1999，14（4）：4145.
ZHU Pinru.Design Theory on Steelconcrete Composite Beam[M].Beijing：China Architecture & Building Press，2006.
[19]DIAB Group.DIAB Sandwich Handbook[M].