As a new type of grain barn wall component, the “Structure-Insulation” integrated wall panel (SIW) has excellent characteristics such as a high-bearing capacity and good insulation performance. In order to study its mechanical properties under grain load, this paper designed three wall panels with different thicknesses, carried out static loading tests on them, studied their cracking and ultimate load, and analyzed the development trend of the wall panel’s crack and deflection. In order to study the reliability of wall panels under stochastic conditions, the performance functions of the wall panel under deflection and strength control conditions were established. The reliability analysis was carried out by using the response surface method and finite element software. The sensitivity degree of each random parameter to different performance functions was quantified. The results show that, under the maximum grain load condition, the deflection of the designed specimens is less than l0/250, and the crack width is less than 0.2 mm, both of which meet the requirements of the normal use limit state. The cracking loads of the three specimens are 13.02, 14.75, and 16.49 kN/m2, respectively, with corresponding crack widths of 0.06, 0.07, and 0.06 mm. The ultimate load is 65.1, 75.52, and 82.47 kN/m2, with corresponding maximum crack widths of 1.66, 1.60, and 1.61 mm, respectively. The reliability indexes of the deflection and strength of the thinnest specimens are β1=2.60 and β2=3.26, respectively, which meet the safety conditions of ductile failure. The parameter affecting the reliability of concrete deflection is the grain gravity density, with a correlation coefficient of −0.707. The parameter affecting the reliability of concrete strength is concrete strength, with a correlation coefficient of 0.935. Combined with the static load test and reliability analysis, the designed wall panel can meet the normal use of grain under full load and has good reliability. Sensitivity analysis can provide a reference for the optimization of practical engineering design.

The traditional brick bungalow is not conducive to long-term grain storage because of its poor thermal insulation. In this paper, a new type of wall element for grain bungalows with both load-carrying and thermal insulation functions, called a “Structure-Insulation” integrated wall panel (SIW), is proposed for improving the grain storage environment. To study the thermal insulation reliability of SIW under multivariable randomness and the availability of different grain storage zones, a finite element model was established based on the test. Then, the failure criterion was established with the heat transfer coefficient as the key point and 1,000,000 sampling calculations were carried out by the Monte Carlo method. The reliability was discussed and sensitivity of random parameters was quantified. The thermal performance test shows that the heat transfer coefficients of the two designed SIW wall panels compared with the traditional brick bungalow wall are reduced by 45.81% and 56.13%, respectively. The thickness of the insulation panel is sensitive mostly to the thermal insulation performance, with a correlation coefficient of 0.877. When the thickness of the insulation panel is 80, 94, and 107 mm, the wall panel can meet the limit requirements of the heat transfer coefficient of the granary enclosure structure of 0.59, 0.53, and 0.46 , with reliability indexes of 3.08, 1.82, and 1.75, respectively. The research results provide an important reference for the design, optimization, and application of SIW wall panels in thermal insulation.

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