Underground granaries naturally preserve grain quality by maintaining low temperatures and reduced oxygen levels, eliminating the need for artificial cooling and pest control. However, cast-in-place reinforced concrete construction faces challenges such as waterproofing and complex on-site processes, necessitating prefabricated steel plate-concrete composite structures with robust joints for enhanced structural integrity and streamlined construction. The study utilizes a full-scale prefabricated steel plate-concrete underground silo, instrumented with strain gauges on circumferential steel bars and internal steel plates to monitor stress variations during six distinct backfilling loading cases. Concurrently, finite element models were developed using ABAQUS 6.14 software for numerical simulations, which were validated against experimental data. Stability analyses, including buckling load assessments and parameter sensitivity studies, were conducted to evaluate the effects of joint quantity and bending stiffness on the structural performance of the composite walls. The results revealed that circumferential joints play a critical role in stress distribution within the composite walls, underscoring the necessity of optimized joint design. The numerical model accurately replicated experimental results, with deviations below 9%, confirming its reliability. Furthermore, an equivalent joint design method was established, demonstrating that a joint bending stiffness ratio above 1.1 ensures that prefabricated composite walls achieve critical buckling loads comparable to cast-in-place walls. These findings provide a robust framework for enhancing the structural performance and reliability of prefabricated underground silos.

This study presents a comprehensive construction monitoring program for a geometrically complex, large-span spatial tubular truss system within a typical center steel exhibition hall. To ensure construction quality and structural integrity throughout the entire process, the monitoring strategy was rigorously aligned with the actual construction sequence. Real-time vertical displacement measurements were acquired at critical structural members and joints. A detailed finite element model of the entire structure was developed to systematically analyze the structural behavior of herringbone columns, primary and secondary trusses, and temporary supports during both installation and removal phases. Displacement patterns at key locations were investigated, and a global stability assessment was performed. Results demonstrate close agreement between finite element predictions and field measurements, confirming the rationality and reliability of the construction scheme. The structural system exhibited excellent stability across all construction stages, satisfying both architectural aesthetics and structural safety requirements. This study provides practical insights for construction control of similar large-span steel structures.

This paper analyzes the influence of different parameters on the seismic performance of reinforced concrete shear walls under granular lateral pressure through numerical simulation. The study focuses on the effects of these parameters on the yield load, peak load, and initial stiffness of the specimens, accompanied by parameter sensitivity analyses. The results indicate that as the grain loading height increases, the ultimate bearing capacity of the shear wall continuously decreases, while increases in concrete strength, axial compression ratio, and wall longitudinal reinforcement ratio lead to continuous improvement in the ultimate bearing capacity. Compared with concrete strength and wall longitudinal reinforcement ratio, increasing the axial compression ratio enhances the bearing capacity more significantly. Moreover, increasing the concrete strength and axial compression ratio effectively improves the initial stiffness of the specimen, whereas the influence of grain loading height and the wall longitudinal reinforcement ratio on the initial stiffness is limited. Within the parameter range considered, the standardized coefficients of concrete strength, axial compression ratio, grain loading height, and wall longitudinal reinforcement ratio on the peak load are 0.463, 0.678, −0.308, and 0.243, respectively. This further confirms that increasing the axial compression ratio can effectively improve the bearing capacity of the specimens.

To investigate the dynamic response characteristics and patterns of underground grain silos subjected to seismic waves from different incident directions, viscoelastic boundaries were employed to simulate the infinite foundation as a continuously distributed spring-damper system on artificial boundaries. A soil-underground grain silo structural model was developed using ABAQUS, into which horizontal seismic waves, vertical seismic waves, and horizontally-vertically coupled seismic waves were input. The acceleration, displacement, and stress responses of the underground structure were analyzed. The results indicate that the maximum horizontal acceleration of the silo wall under coupled seismic action increases by approximately 6% compared to that under horizontal seismic action alone, and the maximum vertical acceleration of the silo wall under coupled seismic action increases by about 12% compared to that under vertical seismic action alone. Therefore, the silo wall exhibits a more significant response under coupled seismic excitation, with a greater impact on vertical seismic effects. The position of maximum tensile stress occurs at the bottom of the silo wall under horizontal and horizontally-vertically coupled seismic waves, whereas it appears at the top of the silo wall under vertical seismic waves.