A Study On The Seismic Performance Of The Rural Monolithic Prefabricated Reinforced Concrete Masonry Structure

In all previous violent earthquakes,rural bulidings have always suffered different degrees of damages,which are the the worst-hit area destroyed in earthquake damage.With the investigation and analysis of earthquake damages on rural architecture,it can be known that the reasons which cause a low bearing force and a poor seismic performance of the rural buildings,could be divided into two facts,on the one hand,due to the type of architecture is not reasonable,such as brick or earth and wood structure;on the other hand,due to the low quality of masonry and non-standard operating activities,and the construction process which cannot be strictly in accordance with the requirements,such as coping with the masonry structure,which finally leads destructive effects.In order to improve the situation,this paper is on the basis of the structural system,and then three types of building blocks which are applicable for villages and towns are developed,as well as the monolithic prefabricated reinforced concrete masonry structure of rural buildings are proposed.Through the research and analysis of this paper,it can be found that the seismic performance of the proposed structure system is better than that of the conventional masonry structure,therefore,it has a great significance to enhance and improve the seismic performance for the rural building structures.With the research and analysis of the rural structural type of Guanzhong area of Shanxi Province,as well as the consultation of massive literature materials concerning rural buildings in earthquake damage has been done in this paper,and with the combination of the current research status of the seismic performance of reinforced concrete block masonry structure,a type of a monolithic prefabricated reinforced concrete masonry structure is then proposed,and a series of research is accomplished involving component to structure,whose main research contents and conclusions can be described as follows:(1)With the investigation of the application actuality,the application scope and the rural structural type of Guanzhong area of Shanxi Province of the existing reinforced concrete masonry structure,combining the current situation of the seismic fortification of the rural buildings,three types of novel reinforced concrete masonry structures with different wall thickness are developed.(2)According to the features of the residence buildings of Guanzhong area of Shanxi Province,the prefabricated reinforced concrete masonry structure is built(all of which are constructed by new block materials),as well as the studies are accomplished on the aspects of seismic performance and the cost of structure.(3)To further study the seismic performance of the monolithic prefabricated reinforced concrete masonry structure,the ABAQUS development kit is adopted for a thorough analysis of the structure.After simulation and verification courses,the proper constitutive relation and damage model of the reinforced concrete masonry structure fitted for modeling is then determined,as well as the reasonable parameter values are defined in ABAQUS.(4)The mechanical properties of the periphery beam,the constructional column and the wall plate constructed by the proposed concrete masonry is studied in this paper,and a comparative analysis is made with the conventional reinforced block masonry and brick masonry,which establishes 24 finite element models.The analysis results show that the holistic characteristics of assembled monolithic reinforced concrete masonry is better than that of the conventional block masonry,which also has a higher ultimate bearing capacity.Compared with brick masonry,it has more significant advantages.(5)In order to evaluate the seismic performance of the structure precisely,in this paper,the seismic fortification level of the reinforced masonry structure is proposed which adopts the performance-based seismic design.The seismic performance of the proposed structure is evaluated by taking the interlaminar displacement angles between the layers as the control variables.(6)Finally,on the basis of the structure hierarchy,by taking the rural building structure of Guanzhong area of Shanxi Province as the prototype,a three-dimensional calculation model of the monolithic prefabricated reinforced concrete masonry structure with two-storey and two-span and a comparison model of a brick masonry structure are established,respectively,and the elastic-plastic time history analysis is performed to investigate the structure of these two models,which is based on the parameters such as the modulus of the structure,the interlaminar displacement angles between the layers,thebase shear and the damages,as well as the seismic performance is evaluated in this paper.Analysis results show that the structural stiffness distribution of the 190 reinforced masonry is more uniform than that of the 240 reinforced masonry,whose former stiffness is 2.0 times of the latter;the base shear beared by the monolithic prefabricated reinforced concrete masonry structure is small,as well as the damage degree of strengthened structure is low,and the seismic performance is better.