波形钢腹板组合梁无黏结预应力筋应力增量研究

发布时间：2018-12-28 11:44

【摘要】：预应力波形钢腹板组合梁翼板内的无黏结预应力筋应力变化与梁上荷载之间存在显著的相关关系,因而无黏结预应力筋的应力增量可以通过截面配筋指标等相关参数建立回归公式。参数分析表明:对于受弯破坏的预应力波形钢腹板组合梁,影响翼板内无黏结预应力筋应力增量的主要参数为受拉翼板的钢筋屈服强度及配筋率、钢翼缘板屈服强度及面积、翼板混凝土强度以及混凝土翼板厚度与梁截面高度之比,而波形钢腹板的厚度及其屈服强度、预应力筋的初应力及预应力筋配筋面积、梁跨高比等参数影响很小。通过大量计算分析,建立了翼板内无黏结预应力筋应力增量与受拉翼板的钢筋屈服强度及钢翼缘板屈服强度的关系,并提出了预应力波形钢腹板组合梁屈服时预应力筋应力增量计算方法,计算结果精度较好。
[Abstract]:There is a significant correlation between the stress change of unbonded prestressed tendons and the load on the beam in prestressed corrugated steel web composite beams. Therefore, the stress increment of unbonded prestressed tendons can be established by the relevant parameters such as section reinforcement index. The parameter analysis shows that the main parameters affecting the stress increment of unbonded prestressed tendons are the yield strength and reinforcement ratio of the steel flange plate, the yield strength and area of the steel flange plate for the prestressed corrugated steel web composite beam subjected to bending failure, the main parameters affecting the stress increment of the unbonded prestressed tendons in the airfoil. The concrete strength of the slabs, the ratio of the thickness of the concrete flange to the height of the beam section, and the thickness and yield strength of the corrugated steel webs, the initial stress of the prestressed tendons, the area of the prestressed tendons and the ratio of beam span to height have little influence. Through a great deal of calculation and analysis, the relationship between the stress increment of unbonded prestressed tendons and the yield strength of steel flange plates is established. A method for calculating the stress increment of prestressed tendons when the prestressed corrugated steel web composite beams yield is presented, and the accuracy of the calculation results is good.
【作者单位】：清华大学土木工程系;清华大学土木工程安全与耐久教育部重点实验室;中国建筑科学研究院;
【基金】：国家自然科学基金项目(51138007,51222810) 国家科技支撑计划(2011BAJ09B02)
【分类号】：U448.216;U441

【参考文献】