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Design of Environmental Engineering Concrete Structures Based on Strain Limit and Crack Control

机译:基于应变极限和裂缝控制的环境工程混凝土结构设计

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Environmental engineering structures are designed for strength but crack control to preventleakage and other long-term durability problems remain important serviceability requirements.The service design requirement is accomplished by using the environmental durability factor(EDF) on top of the applicable load factors to limit the stresses/strains in reinforcement at theservice load level. The use of EDF increases the factor of safety and reduces the strain in tensionsteel at nominal strength. This is not consistent with the concept of Unified Design Approach(UDA) adopted in the 2006 edition of the ACI 350 code. The UDA requires that for flexuraltension controlled sections, strain in the tension reinforcement should reach at least 0.005 atnominal strength. This paper proposes a more rational design method for environmentalstructures based on limiting strain and crack width at service level and ensuring strength at theultimate loads. Design procedure is streamlined and the use of EDF eliminated. An example isincluded to illustrate the problems with the current design approach and the applicability of theproposed method.
机译:环境工程结构的设计旨在提高强度,但要控制裂缝以防止 泄漏和其他长期耐久性问题仍然是重要的可维护性要求。 通过使用环境耐久性因子来完成服务设计要求 (EDF)在适用的荷载系数之上,以限制钢筋在钢筋混凝土处的应力/应变。 服务负载水平。 EDF的使用增加了安全系数,并减小了拉力的应变 标称强度的钢。这与统一设计方法的概念不一致 (UDA)在2006年版的ACI 350代码中采用。 UDA要求弯曲 受张力控制的截面,抗拉钢筋中的应变应至少达到0.005, 标称强度。本文提出了一种更加合理的环境设计方法 基于在使用水平上限制应变和裂缝宽度并确保强度的结构 极限载荷。简化了设计程序,并取消了EDF的使用。一个例子是 包括以说明当前设计方法存在的问题以及该方法的适用性。 建议的方法。

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