陈亚春，刘  俊
（香港华艺设计顾问（深圳）有限公司，深圳518031)

[摘要] 目前工程设计中广泛采用的SLABCAD软件，能够较准确分析无梁楼盖的内力，并给出基于承载力的配筋计算结果，但该配筋没有考虑裂缝宽度限值条件。本文针对SLABCAD软件的计算原理进行分析，研究基于承载力计算的配筋与基于裂缝宽度限值的配筋计算之间的关系，提出基于SLABCAD软件并能满足裂缝宽度限值要求的实用设计方法，给出了裂缝控制配筋调整系数卢的显式表达。算例表明，文中提供的β数值是正确的。最后，对低配筋率受弯构件内力臂系数 η的取值进行了讨论，指出如按《混凝土结构设计规范> (GB50010-2002)取值将使该类构件最大裂缝宽度计算偏于保守较多。
[关键词] 无梁楼盖；裂缝宽度：配筋调整系数；SLABCAD软件；内力臂系数

Practical design method considering crack width for girderless floor structures
Chen Yachun, Liu Jun
(Hong Kong Hua Yi Designing Consultants (S.Z)Ltd., Shenzhen 518031, China)

Abstract: The intemal forces of girderless floor structures can be correctly analyzed using SLABCAD software which is broadly applied into engineering design at present. Meanwhile, the reinforcement design result based on capacity can be obtained, not considering the condition of crack width linut. The computing principle of SLABCAD software is first analyzed. The relation between the reinforcement design based on bearing capacity and crack width limit are researched Then the practical design method based on SLABCAD software is presented in which the crack width limit can be taken into consideration and the reinforcement design adjusting coefficient βcontrolled by crack width. The computing example shows that theβvalues proposed are correct. Finally, the intemal lever arm coefficient η of low reinforcement ratio flexural members is discussed, pointing out that the value of η referring to code will lead to the excessively conservative computation.
Keywords: girderless floor; crack width; reinforcement design adjusting coefficient; SLABCAD software; internal lever arm coefficient