The present research is focused on developing efficient, durable flexural members by combining the use of lightweight concrete (LWC), fiber‐reinforced polymer (FRP) bars, and prestressing. The use of LWC reduces the structural weight while providing suitable thermal insulation whereas using FRP bars instead of steel reinforcement provides corrosion resistance, light weight, high tensile strength, and fatigue resistance. Both materials possess smaller moduli of elasticity compared to those in materials within conventional construction, which may cause large deflections and excessive crack widths that are addressed via prestressing. Six LWC beam specimens were fabricated and tested, all of which contained FRP bars. Two specimens were not prestressed, one in under‐reinforced and the other in over‐reinforced conditions. The other four specimens contained different configurations of prestressing steel in addition to FRP bars. The experimental results were used to validate nonlinear finite element models in Abaqus. Results showed that of a prestress level of 6 MPa in concrete reduced the beam deflection at failure by 28% and increased the cracking load by three times. Therefore, a relatively small prestress level could compensate for the increase in deflection and possible cracking, which shows the merits of this combination in providing an optimal solution for the structural members of the future.

中文翻译：

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GFRP筋加固钢绞线的轻质混凝土梁的抗弯性能。

本研究的重点是通过结合使用轻质混凝土（LWC），纤维增强聚合物（FRP）筋和预应力来开发高效，耐用的抗弯构件。LWC的使用减轻了结构的重量，同时提供了合适的隔热效果，而FRP筋代替了钢筋，可提供耐腐蚀，轻质，高拉伸强度和耐疲劳性。与传统结构中的材料相比，两种材料均具有较小的弹性模量，这可能会导致较大的挠度和过大的裂缝宽度，这是通过预应力解决的。制作并测试了六个LWC横梁样本，所有样本均包含FRP筋。没有对两个标本进行预应力，一个是在钢筋不足的情况下，另一个是在钢筋过度的情况下。除FRP钢筋外，其他四个试样还包含不同的预应力钢构型。实验结果用于验证Abaqus中的非线性有限元模型。结果表明，混凝土中的预应力水平为6 MPa时，可将破坏时的梁挠度降低28％，并将开裂荷载提高三倍。因此，相对较小的预应力水平可以补偿挠度的增加和可能的裂纹，这表明了这种组合的优点，可以为将来的结构构件提供最佳解决方案。结果表明，混凝土中的预应力水平为6 MPa时，可将破坏时的梁挠度降低28％，并将开裂荷载提高三倍。因此，相对较小的预应力水平可以补偿挠度的增加和可能的裂纹，这表明了这种组合的优点，可以为将来的结构构件提供最佳解决方案。结果表明，混凝土中的预应力水平为6 MPa时，可将破坏时的梁挠度降低28％，并将开裂荷载提高三倍。因此，相对较小的预应力水平可以补偿挠度的增加和可能的裂纹，这表明了这种组合的优点，可以为将来的结构构件提供最佳解决方案。