Life-cycle cost assessment of RC and ECC frames using structural optimization
Life-cycle cost assessment of RC and ECC frames using structural optimization
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DOI：
10.1002/eqe.2193
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发表时间：
2013-01-01
影响因子：
4.5
通讯作者：
Gencturk, Bora
中科院分区：
文献类型：
--
作者：
Gencturk, Bora
本研究对结构框架的寿命周期成本（LCC）进行了评估。采用两种不同的材料，钢筋混凝土（RC）和增强工程胶凝复合材料（ECC），具有不同的响应特性来模拟框架。ECC的特点是高拉伸延性和能量吸收和减少裂缝宽度时，与传统的混凝土。然而，这种材料比传统的混凝土更昂贵；因此，为了量化用ECC替代混凝土可能获得的潜在效益，在优化框架中评估了其生命周期性能。考虑了三种不同的结构框架：仅RC框架，仅ECC框架和多材料（MX）框架，其中ECC选择性地应用于潜在的塑性铰位置，而框架的其余部分由RC制成。使用严格的分析方法来评估结构容量和地震需求，以利用混凝土和ECC的不同特性，并将选择性和认知不确定性纳入LCC公式。研究发现，使用ECC的框架的初始和LCC都较低，因为前者节省了横向加固的材料和人工成本，而后者则增加了容量，减少了需求。版权所有：John Wiley & Sons， Ltd
In this study life-cycle cost (LCC) assessment of structural frames is performed. Two different materials, reinforced concrete (RC) and reinforced engineered cementitious composites (ECC), with different response characteristics are used to model the frames. ECC is characterized by high tensile ductility and energy absorption and reduced crack widths when compared to conventional concrete. However, the material is more expensive than conventional concrete; therefore, in order to quantify the potential benefits that could be obtained by replacing concrete with ECC, the life-cycle performance is evaluated in an optimization framework. Three different structural frames are considered: an RC only frame, an ECC only frame and a multi-material (MX) frame in which ECC is selectively applied at the potential plastic hinge locations while the remainder of the frame is made of RC. The structural capacity and earthquake demand are evaluated using rigorous analysis methods to capitalize on different characteristics of concrete and ECC, and both aleatory and epistemic uncertainties are incorporated into the LCC formulation. It is found that both the initial and LCC of frames that use ECC are lower due to savings in material and labor cost of transverse reinforcement for the former and due to increased capacity and reduced demand for the latter. Copyright (C) 2012 John Wiley & Sons, Ltd.