无粘结预应力混凝土梁非线性有限元分析方法研究

无粘结预应力混凝土的计算并不象有粘结预应力混凝土那样,由外荷载引起预应力筋的应变不能根据相应截面的混凝土的应变求得,其应力的计算比较复杂.以有限元理论为基础,提出无粘结预应力混凝土梁的全过程分析模型,并研究编制了计算程序,分析了无粘结预应力混凝土的整个受力过程、变形发展、混凝土及无粘结筋的应力分布状态等.实例计算结果表明,该模型具有较好的精度,可用于工程结构的实际模拟分析.

Nonlinear finite element analysis of unbonded prestressed concrete beams

Unlike the calculation for bonded prestressed concrete, strains in prestressed bars caused by outer loads in unbonded prestressed concrete cannot be obtained by the strain of the concrete in the relevant section. The calculation of the stress is relatively complex. To overcome this, on the basis of finite element method (FEM), a nonlinear full range analytic model of unbonded prestressed concrete beams was developed to show the normal process of bearing capacity, deformation, and stress distribution for the material. Analysis shows that the nonlinear FEM model is applicable with sufficient accuracy for practical use.