This chapter examines the determination of gate loads and load settlement in mass flow storage bins handling bulk solids. The interaction between hopper stress fields and isolating gates is reviewed, highlighting the distinction between active, passive, and transitional stress states and their influence on vertical pressures acting on gates. Analytical models based on mass flow wall load theory are presented, with emphasis on the role of the j factor in governing predicted gate loads and its treatment in standards. The results of a detailed pilot scale experimental program using iron ore are discussed, including measurements during filling, subsequent load settlement, and variations in gate clearance. These experiments demonstrate substantial load transfer from the gate to the hopper walls as passive stress conditions develop, leading to significantly lower sustained gate loads than conservative standard predictions. The chapter also addresses stress state transitions, load cushioning, and dynamic effects during filling, providing practical guidance for more realistic gate load assessment in bulk solids handling system design.

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Gate Loads and Load Settlement

  • Alan W. Roberts

摘要

This chapter examines the determination of gate loads and load settlement in mass flow storage bins handling bulk solids. The interaction between hopper stress fields and isolating gates is reviewed, highlighting the distinction between active, passive, and transitional stress states and their influence on vertical pressures acting on gates. Analytical models based on mass flow wall load theory are presented, with emphasis on the role of the j factor in governing predicted gate loads and its treatment in standards. The results of a detailed pilot scale experimental program using iron ore are discussed, including measurements during filling, subsequent load settlement, and variations in gate clearance. These experiments demonstrate substantial load transfer from the gate to the hopper walls as passive stress conditions develop, leading to significantly lower sustained gate loads than conservative standard predictions. The chapter also addresses stress state transitions, load cushioning, and dynamic effects during filling, providing practical guidance for more realistic gate load assessment in bulk solids handling system design.