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(華誠博遠(yuǎn)工程技術(shù)集團(tuán)有限公司， 北京 100052)
［摘要］近年來，采用無梁樓蓋體系的地下室頂板破壞事故時(shí)有發(fā)生。結(jié)合工程需要，將中美混凝土規(guī)范無梁樓蓋抗沖切內(nèi)容進(jìn)行對比，分析異同優(yōu)劣。結(jié)果表明：對于梁抗剪計(jì)算，美混規(guī)考慮了混凝土斜裂縫開裂后增加的剪力轉(zhuǎn)移到抗剪箍筋這一因素，更加合理；對于板抗沖切計(jì)算，不設(shè)置抗沖切鋼筋時(shí)，美混規(guī)抗沖切承載力略高于混規(guī)。之后結(jié)合工程案例給出設(shè)計(jì)建議。
［關(guān)鍵詞］無梁樓蓋；板柱體系；沖切；中美規(guī)范
中圖分類號(hào)：TU318 文獻(xiàn)標(biāo)識(shí)碼：A文章編號(hào)：1002-848X(2021)17-0050-04
Comparison of punching resistance design of beamless floors between Chinese and U.S. codes and analysis of beamless floor accidents
WANG Lijun
(Huachengboyuan Engineering Technology Group, Beijing 100052， China)
Abstract: In recent years, the roof damage accidents of basements using beamless floor systems have occurred from time to time. In accordance with the needs of the project, the content of punching resistance of the beamless floor in the Chinese and U.S. concrete structure design codes was compared, and the similarities and differences were analyzed. The results show that for the calculation of beam shear resistance, the U.S. concrete structure design code takes into account the factor that the increased shear force after the concrete diagonal crack cracks is transferred to the shear stirrup, which is more reasonable; for the calculation of the slab punching resistance, when the punching resistant reinforcement is not set, the punching resistance bearing capacity of U.S. concrete structure design code is slightly higher than that of Chinese concrete structure design code. After that, design suggestions were given based on the engineering case.
Keywords:beamless floor； slab-column system； punching; Chinese and U.S. code
作者簡介：王立軍，全國工程勘察設(shè)計(jì)大師，博士，教授級(jí)高級(jí)工程師，Email: 13901212966@sina.cn。
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