The Analysis On Restoring Force Model And Influencing Factors Of Multi-ribbed Composite Wall

Multi-ribbed slab structure is a new energy-saving residential building structure system, which has lots of advantages, such as good seismic performance, light weight, high speed of construction, energy conservation, environmental protection, low cost and so on. It has broad prospects for development. Multi-ribbed composite wall, as the key component to bear loads of multi-ribbed slab structure, has achieved substantive results in the theoretical research and practical application. This paper summarizes the wallboard's calculation method of restoring force model, which is based on the theoretical research foundation and experimental research data of it. And then further studies are made for the restoring force model of multi-ribbed composite wall and its influencing factors with the numerical simulation test by ANSYS. The following studies on multi-ribbed composite wall are carried out:1.According to the previous trial's parameters of Multi-ribbed composite wall, this paper use the ANSYS to simulate the wallboard's mechanics characteristic and the mode of failure under vertical steady load and horizontal reciprocate load. The analysis shows that the results of finite element simulation match well with experimental ones.2. Based on finite element model, shear span ratio, axial compression ratio, block strength, concrete strength, the reinforcement ratio is selected as the five factors which influence restoring force model. Besides, using orthogonal experiment design thought, the expansion numerical simulation by changing the level of each factor is carried out. Then the Intuitive analysis and the variance analysis are adopted to discuss the significant of each influencing factor in the skeleton curve of the restoring force model.3. Through the analysis of characteristics of skeleton curve and the regression analysis of experimental data, the formula to calculate the key points of skeleton curve are carried out, which contain two influencing factors:the shear span ratio and axial compression ratio. Moreover, stiffness degradation formula was put out with the parameter of displacement and axial compression ratio by the phenomenon that the skeleton curves getting steeper, the hysteresis laps becoming less and stiffness degradation getting obvious.