This paper presents a new type of steel pipe-concrete.In order to study the static behavior of this structure,the composite truss and the common truss finite element analysis model are established.And ANSYS is applied to be a comparative analysis.Research results show that the composite has the uniformity of the internal force distribution,full play to material strength,better large bending rigidity.For the composite which simply supported at both ends,its web member has a great axis force and the web member of the mid-span is small（almost zero）.This is similar to the shear behavior of solid web beam.The bottom chord bar is in tension and the upper concrete plate instead of upper chord is in compression,which can make full use of strength of concrete and steel.%提出了钢管—混凝土组合桁架形式,为研究该类结构的静力特性,对组合桁架与普通桁架分别建立有限元分析模型,并应用ANSYS对其进行了对比分析。研究结果表明,组合桁架的内力分布均匀,能较好的发挥材料强度,具有抗弯刚度大的特点;对两端简支的组合桁架,其两端腹杆轴力较大,跨中腹杆轴力较小（几乎为零）,与实腹梁受剪性能相似;下弦杆受拉,上弦混凝土板代替上弦杆受压,能充分利用混凝土受压和钢材受拉的材料性能。
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