Temperature Stress Analysis of Tubular Trusses

Temperature stress analysis of tubular trusses needs to consider the dual effects of uniform temperature difference and gradient temperature difference. YJK software adopts a uniform temperature model for rod sections, simulating axial expansion and contraction deformation by defining node temperature differences (such as a maximum temperature increase of 15℃ and a minimum temperature decrease of -10℃). In large-span bridge projects, the axial stress generated by a 102-meter tubular truss under a 30℃ temperature difference can reach 235MPa, requiring the use of elastic membrane floors to constrain and release in-plane deformation.

Modern analysis integrates digital twin technology, such as AIoT platforms that real-time monitor structural strain, combined with elastoplastic mechanics models to predict yield load (P_y=σ_yA(1+2cos²θ)). The Zhongyuan High-speed Railway Port project uses a smart sensor network to control temperature stress errors within ±3%, verifying the consistency between theoretical calculations and measured data.