Development of Probability Models For Concrete Formwork Live Loads

该研究考虑了结构安全中的一个重要问题。施工过程中的失效代表了结构总失效的很大一部分。目前对建筑荷载的处理往往是临时的。这项研究将是合理选择建筑荷载的必要的第一步。在施工过程中，影响多层混凝土结构安全的因素很多。这些因素包括建筑荷载及其在不同楼层和海岸上的分布。以前的一些研究已经解决了不同楼层之间的荷载分配问题。然而，建筑活荷载大小的确定还没有得到足够的重视。板模板活荷载包括建筑材料储存荷载、设备和工人的重量以及浇筑混凝土时的冲击荷载。提出的研究将开发预测模板活荷载的概率模型。所建立的模型将用于确定各种模板构件设计的等效均布荷载。本研究的前提是，模板设计安全的保证必须建立在概率风险度量的基础上。因此，研究的目的是发展基于概率的混凝土模板加载准则。所提出的研究结果将为当前混凝土建筑施工实践的可靠性评估提供所需的荷载模型。这是为混凝土结构的施工阶段建立可接受的风险水平和未来发展基于概率的混凝土施工设计准则的重要一步。

The research considers an important problem in structural safety. Failures during construction represent a significant number of total structural failures. Current treatment of construction loads tends to be ad-hoc. This research will be a necessary first step toward rationalizing selection of construction loads. A number of factors influence the safety of multistory concrete structures during construction. Among these factors are construction loads and their distribution on various levels of floors and shores. Several previous studies have addressed the problem of load distribution among various floors. However, determination of the magnitude of construction live loads has not received adequate attention. Slab formwork live loads include construction material storage loads, weight of equipment and workers, and impact loads when placing the concrete. The proposed research will develop probabilistic models for predicting formwork live loads. The developed models will be used to determine equivalent uniformly distributed loads for design of various formwork memebers. This study is based on the premise that the assurance of formwork design safety has to be based on a measure of risk in terms of probability. Accordingly, the objective of the study is development of probability based loading criteria for concrete formwork. The results of the proposed research will provide the required load model for evaluation of the reliability of current concrete building construction practices. This is an important step in extablishing an acceptable level of risk for the construction stage of concrete structures and future development of probability based design criteria for concrete construction.