Reinforcement Research About Aseismic System Of Brick-concrete Structure With Ring Beam And Constructional Column

Brick-concrete structure had developed rapidly, especially since the founding ofPeople’s Republic of China. However, earthquake happened frequently in our country.Multistory brick building had been destroyed severely in all previous earthquakes.Particularly, the huge8.0magnitude earthquake, which occurred in Wenchuan of Sichuanprovince of China, had caused large casualties and property loss, mostly because of thecollapses of brick-concrete structure. That grieved the whole country and shocked thewhole world. To learn the big lesson, the Seismic Strengthening for damaged structures inthe earthquake is necessary and urgent.It’s the weakness of structural aseismic system that is so common in the brickbuilding which had collapsed in Wenchuan earthquake. Previous research aboutreinforcement of brick masonry is all based on reinforcement of member, and took lessconsideration on seismic behavior of the whole system. After Wenchuan earthquake, theconcept of aseismic system had been emphasized so many times, and our research target isstudying the wholeness of building structure during the disasters, and raising the wholecollapse-resistant capability of structures during the huge earthquake. Based on thisconcept, a new reinforcement scheme is proposed in the view of structural system. It isreinforce brick-concrete structure with ring beam and constructional column by aseismicsystem with external prestressing tendon.Large-scale finite element analysis software SAP2000is applied in this article tocreate a finite element model of brick-concrete structure with ring beam and constructionalcolumn, of structure which is reinforced by aseismic system with external prestressingtendon, and of structure which is reinforced by traditional section-augmented method. Theseismic behavior can be analyzed by comparing two reinforcement structures and theoriginal structure during the earthquake function.Comparing the dynamic characteristics, storey-deformation, storey-shearing forceand wall-body stress in common earthquake under M7separately applied on that tworeinforcement structures and the original structure, we can obtain a conclusion:Reinforcement by aseismic system with external prestressing tendon influences less on structure fundamental frequency, and has little effect while structure is still in the state ofelasticity. However, reinforcement by traditional method can raise structure fundamentalfrequency, enlarge the stiffness of structure and diminish the deformation. So, in the viewof raising component security reserve latter is advantaged.Comparing storey-deformation, hysteretic relationship between top-storeydisplacement and basal shearing force, structural accumulative energy dissipation andstiffness degradation in rare occurrence earthquake above M7separately applied on thattwo reinforcement structures and the original structure, we can obtain a conclusion: Underhuge earthquake situation, while structure comes to the state of plasticity, structurereinforced by aseismic system with external prestressing tendon, can play quite well onseismic behavior. It has somehow effect of shock absorption and dissipation, can restrainthe plasticity development of structure and retard the stiffness degradation. From the pointof earthquake-resistant capability of structural system, it reach the aim of no collapse underhuge earthquake and is more advantaged than traditional reinforcement method. In the endof this article, some prospect is proposed about the applicability of reinforcement byaseismic system with external prestressing tendon and the technical matters ofearthquake-resistant reinforcement.