Pultruded Glass Fiber-Reinforced Polymer (pultruded GFRP) composite produced by the pultrusion method has become popular in civil engineering applications due to its lightness, corrosion resistance and high strength. However, the use of the pultruded profile combining with reinforced concrete is still limited due to a lack of knowledge. Therefore, the behavior of the pultruded GFRP profile infilled with reinforced concrete beams (hybrid beams) is investigated. This study focused on the effects of stirrup spacing for the hybrid beams. Pursuant to this goal, a total of eight different beams were tested under four-point loading. One reference beam without the pultruded profile and seven hybrid beams having different stirrup spacings were considered. Moreover, the hybrid beams with and without stirrups were wrapped by unidirectional GFRP composite to investigate the effects of stirrup spacing on shear capacity of the beams strengthened by GFRP composite. The experimental findings revealed that tightening stirrups increased the load and energy dissipation capacities of the hybrid beams; however, it could not prevent brittle failure. On the other hand, wrapping hybrid beams with GFRP composite increased the load and energy dissipation capacities and also prevented brittle failure regardless of the presence of the stirrups. Therefore, it is strongly recommended that the unidirectional pultruded profiles should be strengthened with 90° GFRP wrapping to have ductile behavior.

采用拉挤法生产的拉挤玻璃纤维增​​强聚合物（拉挤GFRP）复合材料以其质轻、耐腐蚀、强度高等优点在土木工程应用中广受欢迎。然而，由于缺乏相关知识，拉挤型材与钢筋混凝土结合的使用仍然受到限制。因此，研究了填充钢筋混凝土梁（混合梁）的拉挤 GFRP 型材的性能。本研究的重点是箍筋间距对混合梁的影响。根据这个目标，在四点加载下总共测试了八个不同的梁。考虑了一根没有拉挤型材的参考梁和七根具有不同箍筋间距的混合梁。而且，采用单向GFRP复合材料包裹带箍筋和不带箍筋的混合梁，研究箍筋间距对GFRP复合材料加固梁抗剪承载力的影响。试验结果表明，拧紧箍筋增加了混合梁的荷载和能量耗散能力；但是，它不能防止脆性破坏。另一方面，无论是否存在箍筋，用 GFRP 复合材料包裹混合梁都增加了载荷和能量耗散能力，并且还防止了脆性破坏。因此，强烈建议单向拉挤型材应采用 90° GFRP 包裹进行加强，使其具有延展性。试验结果表明，拧紧箍筋增加了混合梁的荷载和能量耗散能力；但是，它不能防止脆性破坏。另一方面，无论是否存在箍筋，用 GFRP 复合材料包裹混合梁都增加了载荷和能量耗散能力，并且还防止了脆性破坏。因此，强烈建议单向拉挤型材应采用 90° GFRP 包裹进行加强，使其具有延展性。试验结果表明，拧紧箍筋增加了混合梁的荷载和能量耗散能力；但是，它不能防止脆性破坏。另一方面，无论是否存在箍筋，用 GFRP 复合材料包裹混合梁都增加了载荷和能量耗散能力，并且还防止了脆性破坏。因此，强烈建议单向拉挤型材应采用 90° GFRP 包裹进行加强，使其具有延展性。用 GFRP 复合材料包裹混合梁增加了负载和能量耗散能力，并且无论是否存在箍筋，都可以防止脆性破坏。因此，强烈建议单向拉挤型材应采用 90° GFRP 包裹进行加强，使其具有延展性。用 GFRP 复合材料包裹混合梁增加了负载和能量耗散能力，并且无论是否存在箍筋，都可以防止脆性破坏。因此，强烈建议单向拉挤型材应采用 90° GFRP 包裹进行加强，使其具有延展性。