| The industrialization of the building structure and the industrialization of the building industry meet the major needs of China’s development and are also an inevitable trend in the development of the building structure field.The prefabricated structure is an important carrier for the industrialization of construction.It has been vigorously promoted due to its advantages of fast construction speed,low labor cost,and environmental protection.Compared with the traditional cast-in-place structure,the structure has high initial cost,low damping ratio,and poor structural integrity.It is more susceptible to earthquake disasters during the entire life cycle.Once damaged,it will cause serious casualties and huge economic losses.To balance the initial construction cost and long-term benefits of the structure,this paper analyzes the seismic vulnerability and the cost of loss during the life cycle of the fabricated structure and the castin-place structure.From a macro perspective,the seismic performance of the fabricated structure is evaluated,and the expected earthquake losses in the life cycle of the fabricated structure are predicted.This is used as the selection criterion for the structural reinforcement plan,and the seismic performance and economic benefits of the engineering structure are well coordinated.The main research contents are as follows:(1)First of all,this article briefly introduces the connection method of assembled structural nodes and OpenSEES finite element software,and selects the assembled structure with unbonded prestressed assembled nodes as the connection method for research.Based on the existing research and the semi-rigid characteristics of the joints,the joint finite element model is established.(2)A five-story cast-in-place structure and an assembled structure with the same size were designed.According to the “Code for Seismic Design of Buildings”,12 seismic waves were selected,using the peak ground acceleration as the ground motion intensity parameter,and the maximum displacement angle between the structural layers as the engineering demand parameter,The seismic vulnerability analysis based on incremental dynamic analysis method is carried out on the two structures.The results show that the IDA curve cluster of the fabricated structure is smoother than the cast-in-place structure,and its vulnerability curve is steeper than the cast-in-place structure.That is to say,under the action of the same intensity earthquakes with different seismic waves,the seismic response of the fabricated structure is larger than that of the cast-in-place structure;under the action of earthquakes of various levels,the probability of failure in each limit state of the fabricated structure is greater than that of the cast-in-place structure.(3)Based on the results of seismic vulnerability analysis,perform a life-cycle cost analysis of the structure.After calculation,it is expected that the seismic loss of the fabricated structure under the action of various levels of earthquakes that may be suffered during its lifetime is greater than that of the cast-in-place structure.The fabricated structure should be reasonably strengthened,and the structural life-saving cost should be used as the evaluation standard to select the structural strengthening scheme to balance the initial construction cost and long-term benefits of the structure,and to coordinate the seismic performance and economic benefits of the structure.(4)Using viscous dampers to reinforce the assembled structure,three reinforcement schemes were proposed according to the general layout principles of the damper.The reinforced assembled structure was compared with the original structure and the cast-in-place structure for seismic analysis,and the most reasonable one was selected.Reinforcement plan.Through the IDA analysis,seismic vulnerability analysis and full life cost estimation of the reinforced structure,the comparison shows that the three types of reinforcement schemes have improved the seismic performance of the structure,and the optimal reinforcement scheme cannot be directly selected from the seismic reduction effect.Taking the cost of earthquake loss for the whole life of the structure as the criterion,the three schemes of "evenly arranged across each floor" were selected as the optimal reinforcement scheme for the fabricated structure in this paper. |
