Research On Seismic Performance Of Prefabricated Horizontal Slotted Shear Wall With Intersecting And Obliquely Distributed Reinforcement

To significantly enhance the industrialization level of the construction industry in our country,it is necessary to leverage the advantages of factory prefabrication and rapid on-site installation offered by prefabricated construction during the architectural design and construction phases.However,the current installation of prefabricated components,such as prefabricated shear wall panels,poses challenges due to excessive vertical connections,resulting in difficulties during installation and compromised construction quality.Therefore,to address these issues,a novel prefabricated horizontal open-joint shear wall system suitable for multi-story rural buildings is proposed.This new system involves inclining the distributed reinforcement within the wall panels and cutting it off at the bottom without considering vertical connections.Additionally,the reinforcement ratio of the edge longitudinal bars is increased to compensate for the loss of bearing capacity in the distributed reinforcement.This innovative system is referred to as the "cross-diagonal arrangement of distributed reinforcement in prefabricated horizontal open-joint shear walls." Through preliminary theoretical analysis and calculations,a research plan for shear walls is devised.ABAQUS finite element analysis software is utilized to simulate the experimental results obtained from existing literature,which helps determine the correct operational procedures and reasonable parameter settings.Subsequently,the seismic performance of the proposed shear wall system,which incorporates the cross-diagonal arrangement of distributed reinforcement,is evaluated through quasi-static loading tests on13 shear wall models.These models are subjected to different axial compression ratios,shear span ratios,angles of inclined distributed reinforcement,edge longitudinal reinforcement ratios,and edge constraint lengths.The obtained research findings are compared with those of traditional shear wall specimens,thereby providing reference and recommendations for the practical application of shear walls utilizing the cross-diagonal arrangement of distributed reinforcement.This thesis primarily consists of the following sections:(1)Two reinforced concrete shear wall models,one with an additional diagonal hidden column and the other as a prefabricated shear wall,are established using the ABAQUS finite element software based on reference experimental parameters.Comparisons between simulated and experimental results of hysteresis curves,skeleton curves,and failure modes reveal a high degree of agreement,confirming the accuracy of the modeling approach and the rationality of the parameter settings.(2)Building upon the validated operations and parameter settings,a performance analysis of shear wall specimens with cross-diagonal arrangement of distributed reinforcement is conducted.Compared to conventional shear wall specimens,the shear capacity of the shear walls with inclined distributed reinforcement at angles of 30°,45°,and 60° respectively increases by 14.36%,16.91%,and 12.86%.Additionally,the initial stiffness increases by 19.43%,22.68%,and 27.11%,respectively.These results demonstrate that inclined distributed reinforcement significantly enhances the bearing capacity,initial stiffness,and energy dissipation capacity of shear walls,thereby improving their seismic performance.(3)The simulated results from the performance analysis are further analyzed.To calculate the bending bearing capacity of the shear wall’s bottom section,a simplified diagram for calculating the shear wall’s bearing capacity is proposed for the prefabricated horizontal open-joint shear wall with cross-diagonal arrangement of distributed reinforcement.The equilibrium equation is established for the cross-section,and adjustment coefficients are fitted based on the contribution of inclined distributed reinforcement to the bending bearing capacity of the wall section.The calculated results show good agreement with the simulated results.(4)Building on the performance analysis,the load-carrying mechanism of the prefabricated horizontal open-joint shear wall with cross-diagonal arrangement of distributed reinforcement is analyzed using the softened strut-and-tie model.A shear carrying capacity calculation formula is proposed for medium-to-high shear walls with a shear span ratio greater than 1.This provides reference for the promotion and application of shear walls employing the cross-diagonal arrangement of distributed reinforcement in practical engineering.