Axial Compression Performance and Load Bearing Capacity Calculation Formula of Precast Concrete with Bolt-steel Plate Connection
The precast concrete panel combined with sandwich insulation technology significantly improves walls'insulation and heat resistance while enhancing construction speed and energy-saving efficiency.This study designs a specimen of a bolt-steel plate connection precast concrete sandwich panel.It conducts an axial pressure load test to investigate its axial compression performance and proposes a calculation formula for the ultimate bearing capacity of the wall under the influence of the bolt-steel plate connection.The test results indicated that the failure mode of the sandwich wall panel is primarily the crushing of concrete above the bolt-steel plate joints and at both ends of the wall toe.Slight stratification between the concrete panel and the sandwich insulation layer is observed at the bottom of the wall,along with large vertical cracks on the side.The experimental axial load capacity of the specimen is compared to the formula proposed in this study and with existing formulas.The results showed that the differences between the test value and the calculated values of the existing formulas in China are approximately 5%,while the dif-ferences with the existing formulas in foreign countries ranged from 45.7%to 77.2%.The difference between the proposed formula and the test value is only 0.4%,indicating that existing foreign formulas are very conservative.The proposed formula accurately predicted the axial bearing capacity of the bolt-steel plate connection wall.Based on the experimental study,a finite element model is established to verify the proposed for-mula,considering parameters such as slenderness ratio,wall thickness,fitting arrangement,and concrete ribs.The analysis results demonstrated that the error between the numerical model and the proposed formula is within-8.05%to 2.65%,while the errors between the existing domestic and foreign formulas and the calculated values are within-2.25%to 8.58%and 41.61%to 78.41%,respectively.The prediction results of the pro-posed formula are more accurate.Finally,the influence of various parameters on the axial bearing capacity of the bolt-steel plate precast concrete sandwich wall is analyzed.The reinforcement ratio of the wall has no significant effect on the ultimate bearing capacity.A reasonable arrange-ment of GFRP connectors,vertical concrete ribs,a reduced slenderness ratio of wall panels,and an increased thickness of concrete panels en-hance the bearing performance of walls.
precast concrete sandwich panelbolt-steel plate connectionaxial compressive performancefinite element analysisbearing capa-city calculation formula
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