CFRP(BFRP) longitudinal bar-GFRP composite stirrup square pipe pile and design method: Fid-Bau Portal

CFRP(BFRP) longitudinal bar-GFRP composite stirrup square pipe pile and design method

GAO FENG / LYU YINGHUI / QIN LEI / LI KE

The invention belongs to the technical field of civil engineering, and discloses a CFRP(BFRP) longitudinal bar-GFRP composite stirrup square pipe pile and a design method. Transverse stirrups and spiral bars of a cross section of the square pipe pile adopt GFRP bars; vertical longitudinal bars and pre-stressed bars of the square pipe pile adopt CFRP (BFRP) longitudinal bars; the square pipe pile is provided with two layers of FRP bar cages; an outer FRP bar cage consists of vertical CFRP(BFRP) longitudinal bars and GFRP stirrups arranged on along the outer edge of the square pipe pile; and aninner circular FRP bar cage consists of pre-stressed CFRP(BFRP) longitudinal bars and GFRP spiral bars arranged on the edge of a circular cavity. The CFRP(BFRP) longitudinal bars on the inner side aremainly used for bearing pulling force when the square pipe pile is used as an uplift pile, improves the anti-cracking performance of the square pipe pile by applying pre-stressing force, and improvesthe lateral stiffness and durability of the square pipe pile. Stress bars of the pipe pile of the invention adopt a fiber reinforced composite material rather than steel, so that the corrosion resistance of the pipe pile is strong, and the pipe pile is suitable for the environment, such as deep sea, with strong corrosion.

本发明属于土木工程技术领域，公开了一种CFRP(BFRP)纵筋‑GFRP复合箍筋方管桩及设计方法，方管桩截面横向箍筋与螺旋筋采用GFPR筋，所述方管桩的竖向纵筋及预应力筋采用CFRP(BFRP)纵筋；所述方管桩设置两层FRP筋笼，外层FRP筋笼由沿方管桩外边缘设置的竖向CFRP(BFRP)纵筋和GFRP箍筋组成，内层圆形FRP筋笼由沿圆形空腔边缘设置的预应力CFRP(BFRP)纵筋及GFRP螺旋筋组成。内侧预应力CFRP(BFRP)纵筋主要用于方管桩作为抗拔桩时所承受得拉力，以及通过施加预应力增加方管桩的抗裂性能，提高方管桩的侧向刚度与耐久性。本发明管桩受力筋均采用增强纤维复合材料，不采用钢材，使管桩耐腐蚀性强，适合于深海等强腐蚀性环境。

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