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陳亞春，劉 俊
（香港華藝設(shè)計顧問（深圳）有限公司，深圳518031)[摘要] 目前工程設(shè)計中廣泛采用的SLABCAD軟件，能夠較準(zhǔn)確分析無梁樓蓋的內(nèi)力，并給出基于承載力的配筋計算結(jié)果，但該配筋沒有考慮裂縫寬度限值條件。本文針對SLABCAD軟件的計算原理進(jìn)行分析，研究基于承載力計算的配筋與基于裂縫寬度限值的配筋計算之間的關(guān)系，提出基于SLABCAD軟件并能滿足裂縫寬度限值要求的實(shí)用設(shè)計方法，給出了裂縫控制配筋調(diào)整系數(shù)盧的顯式表達(dá)。算例表明，文中提供的β數(shù)值是正確的。最后，對低配筋率受彎構(gòu)件內(nèi)力臂系數(shù) η的取值進(jìn)行了討論，指出如按《混凝土結(jié)構(gòu)設(shè)計規(guī)范> (GB50010-2002)取值將使該類構(gòu)件最大裂縫寬度計算偏于保守較多。
[關(guān)鍵詞] 無梁樓蓋；裂縫寬度：配筋調(diào)整系數(shù)；SLABCAD軟件；內(nèi)力臂系數(shù)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
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