Horizontal Shear Transfer Between Ultra High Performance Concrete And Lightweight Concrete
Horizontal Shear Transfer Between Ultra High Performance Concrete And Lightweight Concrete
复制标题
超高性能混凝土与轻质混凝土之间的水平剪切传递
DOI：
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发表时间：
2005
期刊：
影响因子：
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通讯作者：
Tim Banta
中科院分区：
文献类型：
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作者：
Tim Banta
超高性能混凝土，特别是Ductal®混凝土，已经开始彻底改变桥梁设计行业。这种极高强度的材料使较小的复合材料截面能够承受较大的载荷。由于通过复合材料构件传递的力的大小不断增加，因此设计中使用的方程是否适用于新材料至关重要。特别重要的是连接桥面板和梁顶部翼缘的水平抗剪钢筋的设计。如果没有足够的剪力传递，抗弯和抗剪承载力将大大降低。ACI和AASHTO的当前设计公式并不适用于设计由Ductal®和轻质混凝土组成的截面。进行了24次推离试验，以确定当前的水平剪切设计方程是否可以准确预测复合Ductal®和轻质混凝土截面的水平剪切强度。确定了各种表面处理、增强比和纵横比的影响。将当前设计方程预测的结果与测试期间发现的实际结果进行比较。目前的设计方程都是保守的。由于其能够包含各种内聚力和摩擦系数，建议使用AASHTO LRFD规范（2004）中的公式进行设计。
Ultra high performance concrete, specifically Ductal® concrete, has begun to revolutionize the bridge design industry. This extremely high strength material has given smaller composite sections the ability to carry larger loads. As the forces being transferred through composite members are increasing in magnitude, it is vital that the equations being used for design are applicable for use with the new materials. Of particular importance is the design of the horizontal shear reinforcement connecting the bridge deck to the top flange of the beams. Without adequate shear transfer, the flexural and shearing capacities will be greatly diminished. The current design equations from ACI and AASHTO were not developed for use in designing sections composed of Ductal® and Lightweight concrete. Twenty-four push-off tests were performed to determine if the current horizontal shear design equations could accurately predict the horizontal shear strength of composite Ductal® and Lightweight concrete sections. Effects from various surface treatments, reinforcement ratios, and aspect ratios, were determined. The results predicted by the current design equations were compared to the actual results found during testing. The current design equations were all found to be conservative. For its ability to incorporate various cohesion and friction factors, it is recommended that the equation from AASHTO LRFD Specification (2004) be used for design.