混凝土T梁横隔板合理截面尺寸数值分析

Numerical Analysis of Reasonable Diaphragm Section Size of Concrete T Girder

为研究混凝土T梁桥横隔板合理的厚度和高度,建立了56组混凝土简支T梁ANSYS有限元数值模型,对每组模型进行了施加中载和边载的受力性能分析.分析结果表明,当横隔板高度在肋板高度的54%~81%之间,且横隔板厚度不超过20 cm时,主梁跨中挠度、主梁跨中钢筋最大纵向拉应力以及中横隔板跨中板底钢筋横向拉应力均达到了较为适宜的值.因此,横隔板高度的合理值应在肋板高度的54%~81%之间,厚度合理值应在12 cm^20 cm之间,在以上范围内,具体取值应根据工程实际情况而定.

In order to study the reasonable diaphragm height and thickness of concrete T girder bridge,56 group ANSYS finite element models of concrete simply supported girders were built,stress performance of models have been analyzed under the centre load and side load.The analysis result indicates that some aspects of girders and diaphragms stress performance achieved suitable values when the diaphragm height within limits of 54%-81% of the girder rib height and the thickness of diaphragm is less than 20 cm.these aspects include： the mid span deflection of girders,the maximum longitudinal tensile stress of reinforcements in the mid span,and the transverse tensile stress of reinforcements at the bottom of intermediate diaphragm central position.Therefore,the reasonable values of diaphragm height should be taken during 54%-81% of girder rib height,and the reasonable values of diaphragm thickness should be taken during 12 cm-20 cm,specific values should be taken according to the practice of engineering during these ranges.