Due to process design,structural waterproofing requirements,and structural layout considera-tions,underground wastewater treatment plants often employ ultra-long structures without joints.However,for ultra-long concrete structures,internal forces and deformations will occur during temperature fluctuations and material shrinkage,leading to cracking of structural members that exceed the concrete tensile strength.In this paper,finite element temperature stress analysis of the Xining No.7,an ultra-long underground wastewater treatment plant structure,using SAP2000 software is taken as an example.It introduces the selection of temper-ature differential values and analyzes the temperature stress distribution characteristics and effects on slabs,ex-terior walls,beams,and columns.Based on the analysis results,measures are proposed to mitigate cracks through improved structural design,material selection,and construction processes.
Ultra-long structureTemperature actionEquivalent temperature differenceCrack control
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