摘要
根据预应力混凝土T形梁的预应力钢筋配置特点,推导混杂组合单元,建立相应计算模型,并就几何非线性对其力学响应进行研究。基于实体退化单元理论构造混杂组合单元,混凝土和普通钢筋采用层单元模拟,平直和弯曲预应力钢筋分别采用层单元和空间TL单元模拟。根据有黏结预应力钢筋和混凝土的位移协调性,推导了混杂组合单元的整体转换矩阵和钢筋对混杂组合单元整体刚度矩阵的贡献;同时,实现了多组分材料的双重非线性。由算例分析可知,计算结果与试验成果吻合良好;加载初期至屈服荷载阶段,几何非线性影响不到10%,此阶段可只考虑材料非线性;屈服后至破坏阶段,几何非线性影响超过10%,故进行屈服后的受力性能分析应计入几何非线性。
Based on characteristic of pre stressed steels disposed in internal bonded pre-stressed concrete T girder, the mixed composite element was derived and computational model was put forward, then double nonlinear mechanical behaviors were analyzed. After shell element theory was introduced, mixed composite element was studied. Concrete and common steels we modeled with layered element. The straight and curve pre-stressed steels were respectively tackled by layered ele- ment and TL bar element. According to their consistent displacement conditions, the global transposed matrix was calculat- ed and they were combined to form a single element. Then the contribution matrix of the steel to the combined element was deduced. Through analysis of a classic example, the computational results were close with the available experiment results. Under the yielding loads, the effects of the algebra nonlinear was less than 10%, which indicated that during this range, on- ly the material nonlinear should be considered. When the loads surpassed the yielding loads, the effect was larger than 10%, which indicated that during this range, the algebra nonlinear should also be reckoned.
出处
《新技术新工艺》
2012年第12期33-37,共5页
New Technology & New Process
基金
国家自然科学基金(11072108)
南京航空航天大学国家自然科学基金培育基金(NN2012095)
关键词
预应力混凝土T形梁
混杂组合单元
双重非线性
刚度矩阵
位移协调
Pre-stressed concrete T-shaped girder, Mixed composite element, Double nonlinear, Stiffness matrix, Con- sistent displacement conditions
