十字形截面玻璃纤维复材拉结件预制混凝土夹芯保温外墙板受弯性能研究

RESEARCH ON BENDING BEHAVIOR OF PRECAST CONCRETE INSULATED SANDWICH PANELS WITH CRUCIFORM CROSS SECTION GFRP SHEAR CONNECTORS

为研究十字形截面玻璃纤维复材（GFRP）拉结件的截面面积、布置方式对预制混凝土夹芯保温外墙板的变形、承载能力和组合度的影响,利用十字形截面GFRP拉结件对6块预制混凝土夹芯保温外墙板进行静力受弯试验和组合度计算分析。结果表明：6块预制混凝土夹芯保温外墙板的破坏形态均为适筋混凝土受弯构件延性破坏。采用的两种拉结件分别为a型拉结件和b型拉结件,a型拉结件截面面积为b型拉结件截面面积的2. 46倍,a型拉结件试件相比b型拉结件试件承载力提高约30%;十字形截面GRFP拉结件的布置排数增多、间距减少,将使预制混凝土夹芯保温外墙板的承载力组合度略有提高,而对墙体刚度组合度无明显影响。结果表明,该类十字形截面拉结件夹芯保温外墙板为弱组合度夹芯保温外墙板。

In order to study the influence of the cross-sectional area and the arrangement of cruciform cross-section GFRP connectors on the deformation,bearing capacity and combination degree of the prefabricated concrete sandwich panels,the paper used the precast concrete sandwich panels with cruciform cross-section GFRP connectors for static bending test and combination calculation analysis. The results showed that the failure modes of six precast concrete sandwich panels were ductile fracture of the flexural members. The two kinds of connectors used were respectively a connectors and b connectors,the section area of type a connector is 2. 46 times of the cross-sectional area of b-type connector,the bearing capacity of the specimen was about 30% higher than that of the b-type specimen. The number of rows of the cruciform cross-section GRFP shear connector was increased and the spacing was reduced,which would increase the combination degree of bearing capacity of the sandwich panels however had little influence on the combination degree of stiffness. The results showed that the sandwich insulation wall panels with cruciform crosssection connectors was a sandwich structure with a low combination degree.