基于压缩薄膜效应的混凝土桥面板承载力算法

Prediction methods of loading carrying capacities in concrete bridge deck slabs with consideration of compressive membrane action

摘要:

为研究混凝土桥梁面板的真实承载能力,结合混凝土板内的压缩薄膜效应对结构进分析.通过结构试验的方法分析了一套典型的钢混桥梁结构,试验过程中对配筋率、支撑梁尺寸和混凝土强度进行调整并分析其对承载能力的影响.结果表明,由于压缩薄膜效应的作用,结构的真实承载能力大于现行设计方法的计算结果.根据过去的研究,基于塑性极限理论,建立一套考虑压缩薄膜效应的混凝土桥梁面板的承载力计算方法.在该方法中,对混凝土桥梁面板所承受的侧向约束刚度进行定义.通过与多桥梁面板的试验结果进行对比后发现,该理论模型能够准确地计算出此结构类型的承载能力.

Abstract:

In the investigation of real loading capacities in concrete bridge deck slabs,the study of this type of structure was carried out with consideration of compressive membrane action.A series of experimental test of steel-concrete bridge structures was developed with the analysis of influences from the varying of structural parameters on loading capacities,including reinforcement percentages,supporting beam sizes and concrete compressive strength.Through the study of the experimental results,it was found that the real structural loading capacities are larger than those predicted by current design methods.Therefore,based on the previous research,a prediction method for loading capacities of concrete bridge deck slabs was established with consideration of CMA,which was built based on the plastic ultimate analysis.In this method,the lateral restraint stiffness subjected by concrete bridge deck slabs was provided.The proposed theoretical model is capable of predicting the loading capacities of this type of structure accurately with comparison of results from several bridge deck experimental tests.