地下车库楼盖的裂缝控制分析与研究

CRACK CONTROL ANALYSIS AND RESEARCH OF UNDERGROUND GARAGE BUILDING COVER

目前大部分作法是通过配筋限制裂缝宽度,而从裂缝宽度的角度设置配筋的相关研究涉及较少。针对双层地下车库中的地下一层结构,分析了不同覆土厚度下梁、板裂缝宽度对配筋的影响。分析结果表明,强度控制下的跨中配筋基本或经过略微改动即可满足裂缝宽度要求;梁、板裂缝宽度控制为0.2 mm时相对于裂缝未控制的单方用钢量平均提升7.16%,单层钢筋重量平均提升28.29%。本研究可为不同覆土厚度和裂缝要求宽度下梁、板所对应的选筋提供依据,并可在车库结构设计时提供参考。

The current codes are all about limiting the crack width of the structure,and less research is involved in setting the reinforcement from the perspective of crack width.This paper analyzes the effect of crack width on reinforcement of beams and slabs under different cladding thicknesses for the structure of the first basement level of a double-deck underground garage.The analysis results show that the strength-controlled span-to-span reinforcement can meet the crack width requirement basically or with slight modification,the average steel consumption of beams and slabs with crack width control of 0.2 mm is increased by 7.16%,and the weight of single-layer reinforcement is increased by 28.29%relative to that of uncontrolled cracks.This study can provide a basis for the selection of reinforcement corresponding to beams and slabs with different cladding thicknesses and crack widths,and can be used as a reference in the design of garage structures.