详情

KDOT Column Expert: Ultimate Shear Capacity of Circular Columns using the Modified Compression Field Theory

项目名称：	KDOT Column Expert: Ultimate Shear Capacity of Circular Columns using the Modified Compression Field Theory
摘要：	The extreme event requirement as a limit state set by AASHTO LRFD makes it necessary to develop the actual capacity of concrete sections to accurately design them to withstand the extreme load events. For confined sections subjected to combined axial force and uniaxial bending moment, the actual ultimate flexural capacity is found using the earlier versions of Kansas Department of Transportation (KDOT) Column Expert. Accordingly, it is necessary to develop a computer program that evaluates the section capacity in shear by generating accurate shear-moment interaction diagrams for each level of axial force and compares them to the available experimental results. This analysis can prove useful to estimate the existing capacity of damaged bridge piers when subjected to truck impacts. It is also desirable to have a reliable analysis tool that can be used to assess the actual shear capacity of the pier when developing a repair action. Experimental evidences have shown that the modified compression field theory can capture the actual shear capacity of the section very accurately. In addition, the dowel action of the longitudinal bars acting in tension can contribute to increasing the shear capacity, a factor often neglected by design codes of practice. The nonlinear axial load-strain and uniaxial moment-curvature response of reinforced concrete circular section combined with shear forces is very involved. It is important to note that accurate results are guaranteed when the axial load and bending moments are proportional since loading path dependence is avoided. Rasheed and Abd El Fattah have developed a framework for columns that imposes proportional axial force and uniaxial bending moment on circular sections and iterates to obtain the corresponding deformation parameters. However, this procedure needs to be extended to the general case of shear-moment-axial force interaction.
状态：	Completed
资金：	59720.00
资助组织：	Research and Innovative Technology Administration
执行机构：	Kansas State University
开始时间：	20130701
实际结束时间：	20141231
主题领域：	Bridges and other structures；Highways；Safety and Human Factors