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为研究两跨连续GFRP-混凝土空心组合板的受力性能,进行了2个连续组合板试件的静力加载试验。组合板分别采用环氧树脂胶及栓钉与下部工字钢支座进行连接。试验结果表明,试件最终破坏形态均为跨中截面处受压区混凝土压碎后,下部GFRP型材下翼缘断裂或侧壁屈曲破坏。采用环氧树脂胶连接的试件,边支座可以视为简支支座;采用栓钉连接的试件,边支座可以视为固定支座。随着负弯矩区混凝土的开裂及受拉钢筋的屈服,组合板均出现了明显的内力重分布现象。基于截面分析方法和等效刚度,提出了连续组合板受力全过程计算方法。计算结果表明,组合板的支座反力和截面弯矩试验值与理论值吻合较好,提出的方法可以有效地用于组合板的全过程受力分析。
In order to study the mechanical behavior of two-span continuous GFRP-concrete hollow composite plates, the static loading tests of two consecutive composite plate specimens were carried out. The composite plates are respectively connected with the lower I-beam support using epoxy glue and studs. The test results show that the final failure mode of the specimens is the fracture of the lower flange of the lower GFRP section or the buckling failure of the sidewall after the concrete in the compression zone at the mid-span section is crushed. Epoxy-resin-connected test specimens can be regarded as simply supported supports; studs connected test pieces, and side supports can be regarded as fixed supports. With the cracking of the concrete in the negative bending moment zone and the yielding of the tensioned rebar, the composite plate has a significant internal force redistribution. Based on the cross-section analysis method and equivalent stiffness, a method for calculating the total force of the continuous composite plate was proposed. The calculation results show that the test results of the support plate reaction force and the cross-section bending moment of the composite plate are in good agreement with the theoretical values. The proposed method can be effectively used for the force analysis of the whole process of the composite plate.