简支组合管桁架的试验研究

为了研究组合管桁架的承载性能,对2根简支组合管桁架进行了竖向加载试验。分析了组合管桁架在竖向荷载作用下的受力性能、破坏机理、变形能力以及管桁架的内力分布规律。结果表明:组合管桁架具有良好的承载能力和变形能力;混凝土板厚的组合管桁架的承载能力高于板薄的组合桁架;上弦杆的轴力跨中较小,支座处较大;下弦杆的轴力跨中较大,支座处较小;跨中部分腹杆的轴力较小,支座部分腹杆的轴力较大。

Experimental Study on Simply Supported Composite Tube Truss

In order to research load-bearing capacity of composite tube truss,two simply supported composite tube truss test under vertical loads is presented.The carrying capacity and failure mechanism,ductility,the regulation of the internal force distribution of composite tube truss were analyzed.The result of the test indicates the composite tube truss has good carrying capacity and deformation ability under vertical loads.The carrying capacity of thickness concrete slab composite tube truss is more than the thin concrete slab composite tube truss.The axial force of upper chord is small in midspan and close to the support axial force gradually increased.The axial force of lower chord is larger in midspan and close to the support axial force gradually decreases.Axial force of web member near support is large than web in midspan.