连续刚构桥梁中横向无粘结预应力数值模拟与模型试验

Numerical Modeling and Model Test Study on Lateral Unbonded Prestress of Continuous Rigid Frame Bridge

根据三滩黄河大桥横向预应力的特点制定试验方案与计算模型,通过模型试验与数值模拟,研究在不同的荷载组合及不利工况时,横向无粘结预应力作用下箱梁的应力、变形特性,箱梁混凝土表面的裂纹扩展与分布规律及其承载特性。模型试验与数值分析结果表明,该连续刚构桥梁所采用的横向无粘结预应力体系可满足结构的强度要求。

According to the lateral unbonded prestress characteristics of Santan Bridge over Yellow River,the project of the model test and calculation model were set up.The properties of the stress,deformation,capability and the law of the crack development and its distribution at the concrete surface under the lateral unbonded prestress during different cases of the load and disadvantageous situations were studied by the model tests and finite element analysis.Both the experimental and finite element analytical studies show that the lateral unbonded prestress system used in the Santan continuous rigid frame bridge can satisfy the structural strength.