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首页> 外文期刊>International Journal of Civil Engineering,Transaction A:Civil Engineering >Finite Element and Experimental Investigation on the Flexural Response of Pre-tensioned T-Girders
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Finite Element and Experimental Investigation on the Flexural Response of Pre-tensioned T-Girders

机译：预应力T梁的有限元分析与试验研究

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摘要

A number of analytical and numerical approaches exist for modeling concrete structural members. Finite-element analysis (FEA) is a numerical method that is widely applied to concrete structures based on the use of the nonlinear behavior of materials. The challenge of modeling prestressed concrete structures lies in the treatment of the interface between concrete and prestressing tendons. The FEA-modeling technique discussed in this study is based on general-purpose finite-element packages. This study describes FEA of full-scale high-strength self-compacting concrete, HSSCC pre-tensioned T-girders and its comparison with experimental results. Three 9m length fully pre-tensioned bridge girders, PHSSCC were designed and cast using HSSCC. The girders were instrumented to monitor deflection, pre-tensioned losses, tendon, steel bar, and concrete strains. The girders were then load tested (until failure), predominantly under flexure, and their service and ultimate results including cracking, flexural stiffness, flexural strength, and different ductility indexes were investigated and compared with FEA results. The software package ABAQUS was used to simulate girders and their bonding conditions to verify the accuracy of FEA. A very good agreement was achieved for numerical and experimental crack patterns. The comparison of finite-element modeling (FEM) and experimental results of load-upward and downward deflections indicated satisfactory agreement throughout the load history of the beams until failure. Comparing FEM and experimental results, reasonable agreement was observed for the two methods of ductility indexes. Finite-element modeling tends to overestimate stress in prestressed tendons at the ultimate state of specimens.
机译：存在许多用于对混凝土结构构件建模的分析和数值方法。有限元分析（FEA）是一种基于材料的非线性行为而广泛应用于混凝土结构的数值方法。对预应力混凝土结构进行建模的挑战在于如何处理混凝土和预应力筋之间的界面。本研究中讨论的FEA建模技术基于通用有限元软件包。本研究描述了全尺寸高强度自密实混凝土，HSSCC预张紧T梁的有限元分析，并与实验结果进行了比较。设计并使用HSSCC浇筑了3个9m长的全预张桥梁PHSSCC。对大梁进行监测，以监测挠度，预应力损失，钢筋，钢筋和混凝土应变。然后对梁进行载荷测试（直到破坏），主要是在挠曲下进行，并对其使用和最终结果（包括开裂，挠曲刚度，挠曲强度和不同的延展性指标）进行了研究，并将其与FEA结果进行了比较。 ABAQUS软件包用于模拟大梁及其粘结条件，以验证FEA的准确性。在数值和实验裂纹模式上取得了很好的一致性。有限元建模（FEM）与荷载向上和向下挠度的实验结果的比较表明，在整个梁的荷载历史中，直至破坏为止，其一致性令人满意。比较有限元和实验结果，两种延性指标方法均符合合理要求。有限元建模往往会高估标本最终状态下预应力筋的应力。

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