CFRP Grid/Rigid Foam Shear Transfer Mechanism for Precast, Prestressed Concrete Sandwich Wall Panels.
CFRP Grid/Rigid Foam Shear Transfer Mechanism for Precast, Prestressed Concrete Sandwich Wall Panels.
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用于预制、预应力混凝土夹芯墙板的 CFRP 网格/硬质泡沫剪切传递机构。
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发表时间：
2011
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通讯作者：
W. Bunn
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作者：
W. Bunn
布恩，威廉·格雷格。预制预应力混凝土夹层墙板的CFRP格栅/刚性泡沫剪切传递机制。(在Sami H.Rizkalla博士的指导下)几十年来，预应力预制混凝土夹层墙板一直被有效地用于为各种结构提供建筑围护结构。面板提供了一系列功能，包括提供建筑围护结构、建筑特征、承载重力和风荷载，以及隔热整个结构。典型的混凝土夹芯板由两层离散的混凝土组成，称为怀特，一层在硬质泡沫绝缘内层的两侧。在隔热层上的两个分开的混凝土怀特之间传递剪力的能力，对于实现复合作用和生产结构高效板是必不可少的。传统上，各种各样的钢连接件或实心混凝土区被用来完成这种剪力传递。这些方法虽然在结构上起到了很好的作用，但在保温层上产生了热桥，严重阻碍了整个建筑的隔热价值，从而增加了结构的供暖和制冷成本。本文总结了一种新型碳纤维增强聚合物(CFRP)格栅/刚性泡沫隔热系统作为预制承重夹芯板和建筑覆层剪力传递机制的广泛实验工作。与钢和混凝土相比，CFRP格栅的导热系数明显降低。因此，它能够产生所需的复合作用，同时将热桥效应降至最低。试验计划调查了几个据信影响CFRP格栅/刚性隔热机制剪切流动强度的参数。这些参数包括硬质泡沫保温材料的类型和厚度以及碳纤维布格栅之间的间距。总共对66块板进行了试验，以评估这些参数的剪切流动强度。根据试验结果建立了受这些参数影响的CFRP格栅/硬质泡沫剪切流动强度的估算公式。预制预应力混凝土夹层墙板的CFRP格栅/刚性泡沫剪力传递机理提交给北卡罗来纳州立大学研究生院的论文部分满足了北卡罗来纳州罗利市2011年理科土木工程硕士学位的要求，由：_博士_萨米·H·里兹卡拉博士委员会主席
BUNN, WILLIAM GREG. CFRP Grid/Rigid Foam Shear Transfer Mechanism for Precast, Prestressed Concrete Sandwich Wall Panels. (Under the direction of Sami H. Rizkalla, Ph.D.) Prestressed precast concrete sandwich wall panels have been effectively used for decades to provide the building envelope for a wide variety of structures. Panels provide a host of functions, including providing the building envelope, architectural features, carrying gravity and wind loads, as well as insulating the entire structure. Typical concrete sandwich panels consist of two discrete layers of concrete, called wythes, one on either side of an inner layer of rigid foam insulation. The ability to transfer the shear forces between the two separated concrete wythes, across the insulating layer, is essential in attaining composite action and producing structurally efficient panels. Traditionally, a wide variety of steel connectors or solid concrete zones have been used to accomplish this transfer of shear forces. These methods, though shown to function well structurally, create thermal bridges across the insulating layer and severely hinder the insulating value of the entire building, consequently increasing the heating and cooling costs for the structure. This thesis summarizes the extensive experimental work undertaken to evaluate a new carbon fiber reinforced polymer (CFRP) grid/rigid foam insulation system as a shear transfer mechanism for precast load bearing sandwich panels and architectural cladding. CFRP grid has a significantly lower thermal conductivity in comparison to steel and concrete. Therefore, it is able to create the desired composite action and at the same time minimize the effect of thermal bridging. The experimental program investigated several parameters believed to affect the shear flow strength of the CFRP grid/rigid insulation mechanism. These parameters included the type and thickness of rigid foam insulation and the spacing between the rows of CFRP grid. A total of 66 panels were tested to evaluate the shear flow strength of these parameters. Test results were used to develop an equation to estimate the shear flow strength using the CFRP grid/rigid foam as affected by these parameters. CFRP Grid/Rigid Foam Shear Transfer Mechanism for Precast, Prestressed Concrete Sandwich Wall Panels by William Greg Bunn A thesis submitted to the Graduate Faculty of North Carolina State University in partial fulfillment of the requirements for the Degree of Master of Science Civil Engineering Raleigh, North Carolina 2011 APPROVED BY: ______________________________ Rudolf Seracino, Ph.D. ______________________________ James M. Nau, Ph.D. _______________________________ Sami H. Rizkalla, Ph.D. Committee Chair