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为探讨约束参数对智能预应力钢桁梁承载性能的影响,本文基于开关控制算法,以跨中挠度为控制目标,采用数字信号控制系统进行了双撑杆智能预应力钢桁梁模型在移动荷载作用下的主动控制试验。试验对比研究了普通钢桁梁、普通预应力钢桁梁和智能预应力钢桁梁在跨中挠度和杆件应力约束条件下的最大承载力。试验结果表明智能预应力钢桁梁具有更高的约束承载力,特别适用于对钢桁梁变形有严格限制或可变荷载与永久荷载比值较高的情况,为工程应用提供了参考。
In order to investigate the influence of restraint parameters on the bearing capacity of smart prestressed steel truss girders, this paper, based on the switch control algorithm and taking the mid-span deflection as the control target, uses the digital signal control system to carry out the double-girder smart prestressed steel truss girder model under moving loads Active control test under the action. The maximum bearing capacity of ordinary steel truss beams, ordinary prestressed steel truss beams and intelligent prestressing steel truss girders subjected to mid-span deflection and bar stress constraints were compared and studied. The results show that the smart prestressed steel truss girder has a higher restraining capacity, especially suitable for the deformation of steel truss girder strictly limited or the ratio of variable load and permanent load is higher, which provides a reference for engineering application.