Life Cycle Assessment Of Sustainable Structure

In recent years, with the call for conserving energy and reducing emissionshigher and higher, energy saving in building region is imperative. But the reality isthat policymakers’awareness of energy conservation and environmental protection issignificantly weaker than advanced countries, they make a decision blindly as theystart with construction costs only, neglecting architecture operation and maintenancecosts. Pursuing sustainable building has important practical significance frommacroscopic to microcosmic, on the one hand, it effectively saves energy andresources to ensure that our country’s economic grows rapidly, steadily and healthily,on the other hand, it protects the ecological environment and reduces the emissions ofpollutants, at the same time, it provides a comfortable living environment for residentsand reduces costs as well as enhances construction quality.Many experts and scholars from home and abroad have been committed to thestudy of the life cycle theory of sustainable building, and have achieved someachievements, but their thoughts are different. A systematic system of theory andmethodology has not been formed yet for the whole life cycle assessment ofsustainable construction research. On the basis of introducing the status quo at homeand abroad, the article combines with the theory of life cycle and sustainableconstruction evaluation and a Life Cycle Cost estimation method based on Time Valueof Money is put forward. This way divides construction costs into main building costs,envelop enclosure costs, heating refrigeration costs and facilities costs, which regardsas the basis of evaluating economic benefit. The non-financial targets are fixedthrough Principal Component Analysis according to the survey questionnaire results.Thus a whole evaluation index system is established, then index weight is determinedby adopting the qualitative and quantitative method called Analytic Hierarchy Processand the evaluation score is decided by the way of Fuzzy Comprehensive Evaluation,after that, using the BP neural network model to examine, at last, the optimal decisionscheme is chosen in view of the actual situation by the comparison among ordinarybuilding, energy saving architecture and passive construction scheme. As for a varietyof ways used in the evaluation procedure to process the data, Matlab software canrealize them through using the function of dealing with data by functions in order tocalculate the reliable results fast and conveniently, which makes the computing moreefficient and accurate. By using trigonometric function, the paper structure the evaluation matrix according to quantized values of economic performancetargets,which combines LCC and life cycle assessment. In addition, the BP neuralnetwork is applied successfully to verify that the evaluation method is rational.This article establishes life cycle evaluation index system of sustainable buildingfrom two aspects of economic and non-economic benefits, and adopts relevantqualitative and quantitative methods according to their own features and expectedresults are obtained in the last. It aims to provide theory support for the developmentof sustainable architecture, and presents a reference for enterprises to makeconstruction scheme decision, and offers the basis that the government continue topush forward the sustainable building.