张劲泉, 李鹏飞, 韦韩, 王仙. 注浆加固预应力混凝土空心板梁抗剪性能试验研究[J]. 工程力学, 2020, 37(S): 32-41. DOI: 10.6052/j.issn.1000-4750.2019.04.S059
引用本文: 张劲泉, 李鹏飞, 韦韩, 王仙. 注浆加固预应力混凝土空心板梁抗剪性能试验研究[J]. 工程力学, 2020, 37(S): 32-41. DOI: 10.6052/j.issn.1000-4750.2019.04.S059
ZHANG Jin-quan, LI Peng-fei, WEI Han, WANG Xian. EXPERIMENTAL STUDY ON SHEAR PERFORMANCE OF PREPRESSED CONCRETE HOLLOW SLAB BEAMS REINFORCED BY GROUTING[J]. Engineering Mechanics, 2020, 37(S): 32-41. DOI: 10.6052/j.issn.1000-4750.2019.04.S059
Citation: ZHANG Jin-quan, LI Peng-fei, WEI Han, WANG Xian. EXPERIMENTAL STUDY ON SHEAR PERFORMANCE OF PREPRESSED CONCRETE HOLLOW SLAB BEAMS REINFORCED BY GROUTING[J]. Engineering Mechanics, 2020, 37(S): 32-41. DOI: 10.6052/j.issn.1000-4750.2019.04.S059

注浆加固预应力混凝土空心板梁抗剪性能试验研究

EXPERIMENTAL STUDY ON SHEAR PERFORMANCE OF PREPRESSED CONCRETE HOLLOW SLAB BEAMS REINFORCED BY GROUTING

  • 摘要: 为了对预应力混凝土空心板梁端部剪跨区内出现的腹剪斜裂缝进行加固,提出了对空心板梁端部注浆加固的措施,以达到增加空心板受剪截面积的目的。进行了3片足尺20 m先张法预应力钢筋混凝土空心板梁注浆加固后抗剪性能试验,以验证加固后空心板梁的受力性能及加固效果,三片梁端部注浆长度分别为1.5 m、2.0 m、2.5 m,分析了不同注浆长度下试验梁的应变、挠度、裂缝分布、刚度、承载力变化规律,通过与未加固前梁体试验结果对比,分析端部注浆加固措施对梁体抗剪承载能力的改善程度。试验表明,采取端部注浆加固措施后,梁体整体刚度变化较小,梁体在正常使用荷载作用下,端部剪跨区内没有出现腹剪斜裂缝,梁体的抗剪能力有较大提高,加固后梁体的破坏模式为加固段与未加固段交界处发生的弯剪破坏。

     

    Abstract: In order to reinforce the oblique web shear crack in the shear span of prestressed concrete hollow slab beams, grouting reinforcement at the end of the hollow slab beam is proposed to increase the shear cross-sectional area of the hollow slab. The shear resistance test was carried out on three full scale 20 m pre-tensioned concrete hollow slab beams, to verify the mechanical properties and the reinforcement effect of grouting reinforcement. The grouting length was 1.5 m, 2.0 m, 2.5 m respectively. The concrete strain, stiffness, bearing capacity, deflection and crack distribution were analyzed for the test specimens under different grouting lengths. Through the comparison with the test results of unreinforced beam, the improvement on shear bearing capacity of reinforced beam was demonstrated. The result shows that the overall stiffness of the beam has slight change under normal service load, and no oblique web shear crack occurs in the shear span of the slab beam, but the shear capacity of the beam is greatly improved. The failure mode of the beam with grouting reinforcement is the bending shear failure at the intersection of the strengthened and the un-strengthened parts.

     

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