现浇混凝土空心楼盖消防车等效均布荷载研究

Study on equivalent uniform load of fire trucks on cast-in-situ concrete hollow floor

建立了3种不同跨度且跨度范围为6~15m的3×3跨典型现浇混凝土空心楼盖结构模型,根据影响线原理分析出结构控制截面达到最不利内力时的消防车荷载布置方式,综合考虑覆土厚度、楼板跨度和消防车并行台数等3种因素的影响,采用有限元软件ABAQUS进行结构弹性受力分析,以荷载作用下控制截面的应力及结构变形为等效指标,得到了消防车的等效均布荷载值,并分析了3种因素对等效均布荷载值的影响规律。结果表明,消防车等效均布荷载值随着覆土厚度和楼板跨度的增大而减小,而消防车并行台数的增大使等效均布荷载值相应增大。研究成果可为简化大跨空心楼盖消防车荷载的计算提供参考,也可为荷载相关规范的修订提供依据。

Three types of typical cast-in-situ concrete hollow floor structures with different spans in which quantity of span is 3×3 and spans ranging from 6 to 15 m were established.According to the influence line principle, the layout of the fire engines loads were determined when the structural control section reached the most unfavorable internal force. Considering comprehensively the influence of three factors, such as the thickness of covering soil, the span of floor and the number of parallel fire trucks,etc, the finite element software ABAQUS was used to conduct elastic analysis of structure. Taking the stress and structural deformation of control section under load as equivalent indexes, the equivalent uniform load of fire engines was obtained, and the influence of three factors on the equivalent uniform load value was analyzed. The results show that the equivalent uniform load value of fire trucks decreases with the increase of cover soil thickness and floor span, while the equivalent uniform load value increases with the increase of parallel numbers of fire trucks. The research results can provide a reference for simplifying the load calculation of fire trucks with large-span hollow floor, and can also provide a basis for the revision of load-related codes.