埋入式塑料光纤与混凝土间的应变传递分析

推导埋入式塑料光纤（POF）-混凝土复合体中各相材料间的应变传递模型，并通过有限元数值仿真验证模型的正确性.基于该模型对主要参数进行敏感性分析，分别分析塑料光纤涂覆层的弹性模量、厚度，纤芯弹性模量以及埋设长度对应变传递率的影响.数值仿真计算结果与理论分析基本一致，塑料光纤埋设段中间大部分区域的应变传递率接近于1，说明混凝土内部的应变可有效传递至塑料光纤纤芯.敏感性分析表明，使涂覆层厚度小于0.5 mm，弹性模量大于100 MPa，埋设长度大于300 mm，有利于埋入式塑料光纤与混凝土之间的应变传递.

Strain transfer analysis between embedded plastic optical fibers and concretes

The theoretical strain transfer model between embedded plastic optical fibers (POF) and concrete was developed and verified by numerical simulation using finite element method. Parametric sensitivity analysis was performed for the main parameters based on the strain transfer model. The influence of the elastic modulus and coatings thickness, the elastic modulus of the fiber core and the embedment fiber length on strain transfer rate was analyzed, respectively. The numerical simulation results agree well with the proposed theory, and the strain transmissibility of most areas of embedded plastic optical fibers is close to 1, indicating that the strain in concrete can be transferred to the plastic optical fiber core. The results of sensitivity analysis show that the strain transfer effect of embedded plastic optical fibers and concretes is better when the thickness of coatings is less than 0.5 mm, the elastic modulus of coatings is more than 100 MPa and the embedment length is more than 300 mm.