A Preliminary Research On Long-Life Design And Durability Quantitative Method Of Reinforced Concrete Structure Residences

The economic take-off has accelerated the process of urbanization,but also accelerated the replacement of old and new buildings,especially under the influence of the commercial house market,residential buildings are frequently dismantled and rebuilt,resulting in the average service life of residence in China being far below their designed service life.The short life of residential buildings not only causes huge economic losses and waste of resources and energy,but also causes serious environmental pollution,which is not conducive to the sustainable development of Chinese construction industry.Since the beginning of this century,many scholars have carried out relevant research.These research mainly focused on the analysis of the causes of short-lived buildings,and gave relevant suggestions from the macro level for these reasons,but rarely put forward specific and targeted strategies for architectural design.As a result,the root problem of unbalanced development speed and quality of construction industry has not been completely solved.In addition,the quantitative research on the durability of buildings is insufficient,which makes the maintenance and demolition plan lack of clear basis.Therefore,it is of great practical significance to study the long-life design strategy and durability quantitative method of the most widely used reinforced concrete structure in China.Based on the background and trend of building industrialization,this paper discusses how to use modern and industrial technology to realize the long-life target of residential buildings.The theoretical basis of long-lived architectural design can be traced back to SAR theory,open building theory,metabolism theory and SI theory.The most essential feature of these theories is incorporating the time factor and human needs into residential design,emphasizing the durability of the main structure and the variability of other parts.On this basis,this thesis further divides the long-life design of residence into three parts: the constant system(including structure,shared equipments,public space),the variable system(including exterior envelopes,internal separation,decoration,pipes and equipments),and internal space.According to the characteristics of the three parts,the design principles and specific implementation methods of each system are determined.In addition to the design strategy,this paper also carried out technical research related to long life,that is,the quantitative method of durability.By analyzing the connotation of building life and explaining the meaning of durability,it is pointed out that the quantification of durability can be reflected by life prediction.Based on this,the durability quantitative methods on technical level,the durability quantitative methods on economic level and the durability quantitative methods on functional level are proposed.Finally,the above design strategies and durability quantitative methods are applied to a practical project,which proves the feasibility of the abovetheories and methods,and reflects on it in practice.Proceed from the actual situation,combined with the existing theoretical basis and technical conditions,the paper initially constructs the long-life design strategy and durability quantitative methods of reinforced concrete structure residential buildings.The design principles,specific methods and quantitative methods proposed in this paper enrich the connotation of long-life residence,which have certain practical guidance significance for designers and researchers and are conducive to promoting the transformation of housing industry to high-quality development.There are more than 54000 words and 130 illustrations.