The Effect Of Partial Replacement Of Mortar On Seismic Performance Of Ancient Masonry Structures

Chinese ancient architectures are important witness of the Chinese national civilization.Most of the traditional ancient structures use masonry structures,which are lack of professional design and standard construction.Besides,most structures have problems of insufficient safety and seismic performance.The previous earthquakes disaster data show that the masonry structure are more vulnerable to earthquake damage than other forms of structures,with most serious damage.Therefore,it is necessary to maintain and reinforce ancient architectures.However,for the maintenance and reinforcement of the masonry structure of ancient masonry structures,it is necessary to protect the original structure and appearance of the building.Current reinforcement methods may have great damage to the appearance of the original structure.In view of the repair and reinforcement of ancient architectures on Gulangyu Island,the method of replacing mortar reinforcement is used to strengthen the masonry structure and preserve the authenticity and recognizability of the original structure,according to the principle of minimum intervention.Based on the tests,the ABAQUS finite element software is used to simulate the test of the masonry structures with the replacement mortar.The effect of partial replacement of high-strength mortar on the shear and compression resistance of masonry components are studied by separate modeling method.From the comparison of test and simulation results,it can be seen that partial replacement of high-strength mortar can improve the shear strength of the component,with verify the simulation method.Based on the existing research results,further study and comparison of the masonry members during shear compression combined forces,the effects of replacement mortar on the bearing capacity of the masonry members under different working conditions,Including the effects of displacement horizontal gray seams and vertical gray seams.The effect of different shear ratios and different masonry methods,found that simultaneous replacement of horizontal gray joints and vertical joint mortar,appropriate shear ratio and full-fence masonry,the capacity of the replacement mortar to support the bearing capacity of the members The improvement effect is most significant.Through the simulation analysis of existing results,it provides guidance for subsequent experimental research.In the actual reinforcement and repair of ancient buildings,if large-scale replacement mortar is used,it will greatly disturb the original appearance and stress state of the structure,fail to achieve the expected results,and waste a lot of resources.Based on the actual structures on Gulangyu Island,this paper establishes a numerical model through ABAQUS software to study the damage of the structures under earthquakes.At the same time,it proposed between the unreinforced and reforced buildings.The different of the masonry structure.Minimize the disturbance to the original structure and achieve the principle of minimum intervention.The calculation of the simulation results can provide a basis for the subsequent actual reinforcement construction.