关键词: 玻璃钢夹砂结构, 半圆、半椭圆拱, 应力应变特征, 受力特性

Abstract: In order to study the stress and deformation characteristics of the buried arched FRP sand-filled structure as the top of the assembled culvert, the arched FRP sand-filled structure is embedded in the concrete straight wall on both sides, and the maximum allowable deformation of the structure is taken as the control index. The simulated load test of the buried glass fiber reinforced plastic arched structure is carried out. The mechanical parameters of the arched structure under six working conditions, such as semicircle, semi-ellipse, load value and soil height, are studied. The feasibility of the glass-reinforced sand-sand structure as the top structure of the culvert is verified. The results show that in the case of the same deformation, the semi-elliptical arch structure with a cover height of 30 cm is 10.7% higher than the semicircle, 10.5% when the cover height is 60 cm, and 90 cm when the cover height is loaded to 52 tons. The shear failure of the body caused the test to terminate prematurely, and the FRP material did not show cracks and other damages; as the span ratio decreased, the horizontal thrust became larger. Under the same load, the semi-circular FRP sand-sand structure was covered in different soils. The horizontal and vertical displacements are 23%~33% and 16%~22% larger than the semi-ellipse, respectively. Therefore, the semi-elliptical structure is better stressed. Both arched FRP sand structures can be used as the assembled culvert top structure. This provides theoretical and technical support for the promotion and practical construction of FRP materials in the future.

Key words: FRP sand-filled structure, semi-circular, semi-elliptical arch, stress-strain characteristics, force characteristics