| Prefabricated assembly building is the main form of industrialization,which has some advantages such as high quality,short construction period and low energy consumption.However,in the areas of high seismic fortification,the safety requirements of prefabricated assembly buildings are high,the joint connection process is complex,the construction is difficult,and the cost is very high,which is not conducive to the development of prefabricated assembly houses.And,earthquake occurred frequently in China,the earthquake has brought huge economic losses and casualties,so the prefabricated assembly buildings is harder to develop in high seismic area.In order to reduce the earthquake disaster,improve the safety of the house and reduce the cost,it is very important to analyze and optimize the cost of prefabricated assembly buildings from the point of view of seismic fortification intensity,which is of great significance to the promotion of prefabricated assembly houses in high seismic fortification area.First of all,based on the theory of life cycle cost of prefabricated assembly houses,the PSO-BP neural network algorithm is applied to the cost estimation of prefabricated assembly houses,at the same time,the cost prediction model is established considering the seismic fortification intensity.The simulation of the instance data of different fortification intensity is carried out,and the change curve of prefabricated assembly houses cost with precast rate is drawn.The cost of prefabricated assembly is preditedby the PSO-BP neural network algorithm,and the reasonable range of the prefabricated rate is obtained.Then,a residential building in Xi’an is used as the prototype,in accordance with the National Standard Design Atlas,prefabricated shear walls,prefabricated laminated panels,prefabricated stairs,prefabricated air conditioning panels and other prefabricated components are reasonably split design.The prefabricated assembly houses models of 6 degrees,7 degrees,8 degrees seismic fortification intensity are established with PKPMCAD module of the PKPM structure design software and are analyzed with SATWE module.The total cost of prefabricated assembly houses in different seismic fortification intensity are calculated.Based on the optimal seismic fortification intensity decision model,the life cycle cost of the prefabricated assembly house is optimized.From the whole life cycle,the value of the objective function(the whole life cycle cost)is reduced,but not reached the optimal target value due to the high initial cost.Finally,by comparing the cost of prefabricated assembly houses and cast in place houses,the incremental cost of prefabricated house is analyzed,and the main reason for the high cost of prefabricated assembly houses is obtained.Based on this,the control measures of prefabricated assembly houses cost are proposed to achieve the purpose of further reducing costs from the aspects of design,construction,and policy.The results show that the theoretical model of optimal seismic fortification intensity is applied to the cost optimization of prefabricated assembly houses,which can effectively solve the safety and economic problems of the prefabricated assembly buildings in high seismic fortification area,which is favorable to promote the apply the prefabricated assembly buildings in high seismic fortification area.The results of this study can be used as the basis for cost forecast and cost optimization of the prefabricated assembly buildings,the research methods can provide a reference for similar projects. |
