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为了研究钢管轻集料混凝土空间桁架梁的承载力设计方法,进行了钢管轻集料混凝土空间桁架梁试件的纯弯加载试验,通过试件挠度和钢管表面应变分析,研究了桁架梁受弯承载性能。根据平截面假定并忽略腹杆的影响,对跨中截面进行受力分析,提出了空间桁架梁抗弯承载力的计算方法。研究结果表明:钢管轻集料混凝土空间桁架梁受弯过程中,腹杆受力较小,上下弦杆变形基本一致,跨中截面弦杆纵向应变分布基本符合平截面假定;桁架梁挠度超过L/50(L为跨度)时,弦杆和腹杆表面光滑均没有鼓曲现象,破坏模式为延性破坏;实测受弯承载力按正常使用极限状态取值,试验承载力取值与计算结果相差5%以内。
In order to study the design method of bearing capacity of space truss girder with lightweight aggregate concrete filled steel tube (CFST), a pure bending test was carried out on specimens of steel truss light aggregate concrete space truss beams. By analyzing the specimen deflection and the surface strain of steel tube, Carrying performance. According to the assumption of flat section and ignoring the influence of web, the stress analysis of the mid-section is carried out and the calculation method of flexural capacity of space truss girder is proposed. The results show that during the bending process of steel truss lightweight aggregate concrete space truss girder, the webs are less stressed and the deformations of the upper and lower chords are basically the same. The longitudinal strain distribution of the chord of the mid-section cross section conforms to the plane section assumption. / 50 (L is the span), the surface of the chord and the web are smooth, and the ductile failure mode is ductile failure. The measured ultimate bearing capacity is in normal use limit state, and the difference between the test bearing capacity and the calculated value Less than 5%.