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首页> 外文会议>Andy Scanlon symposium on serviceability and safety of concrete structures: from research to practice 2011. >Control of Deflection in Concrete Slabs and Effects of Construction Loads
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Control of Deflection in Concrete Slabs and Effects of Construction Loads

机译：混凝土板挠度的控制和施工荷载的影响

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摘要

This paper is concerned with the effects of high construction loads on long term deflections, and evaluates the ACI 318 deflection control requirements. Practical applications involving two building construction cases are presented. In these cases, the concrete slabs developed extensive cracking and excessive deflections soon after the slab construction and formwork removal. Additional deflections were developed following the installation of interior partitions. The paper also investigates the effects of the shoring/reshoring operations and the construction load history, as well as the effects of improper deflection control design procedures on the slab deflections. The ACI 318 slab deflection control requirements, along with other published proposed methods on deflection control are applied and compared. The conclusions of this study indicate that the ACI's minimum slab thickness requirements for deflection control are not sufficient since they do not account for the creep and shrinkage effects, as well as the effects of early-age high construction loads, and the resulting initial cracking of the concrete members.
机译：本文关注高结构载荷对长期挠度的影响，并评估了ACI 318挠度控制要求。介绍了涉及两个建筑施工案例的实际应用。在这种情况下，混凝土板的建造和模板拆除后不久，混凝土板就出现了大的裂缝和过度的挠曲。安装了内部隔板后，又出现了其他变形。本文还研究了支护/再调整操作和施工荷载历程的影响，以及不正确的挠度控制设计程序对楼板挠度的影响。应用并比较了ACI 318平板的挠度控制要求以及其他已公开的挠度控制提议方法。这项研究的结论表明，ACI对挠度控制的最小板厚要求是不够的，因为它们没有考虑蠕变和收缩效应，早期高建筑荷载的影响以及由此产生的初始开裂。具体成员。

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