The Research On Design Strategy For Preventing And Controlling Reflecting Lights Coming From Glass Curtain Wall Buildings

The glare formed by the sunlight reflection of large glass curtain wall has become a major source of light pollution in the city during the day.The strong glare has increasingly threatened the daily life and traffic of adjoining areas.Glass curtain walls,built in different shapes,have featured by their wide impact scope,high glare intensity and localization.However,studies on its effect,especially on the control strategy,is relatively few.Only some reference standard is not enough.This paper tries to complete the system research in this field.In order to figure out how to prevent glare in the design stage,this paper started from the its cause,explored influencing factors,comprehensively analyzed the mechanism of reflection glare,and summarize the method of reflected light control.First of all,this paper sorted the relevant theoretical results,initially inducted the impact characteristics of reflected glare,explained the structure and form of curtain wall,explored the causes of curtain wall glare,and analyzed the existing evaluation criteria.At the same time,this paper introduces the glare calculation method and related regulations at home and abroad.Secondly,this paper introduced the survey of the glass curtain wall building in Tianjin.The survey included the records the shapes and locations of more than 40 buildings,and monitoring of the influence ranges,duration and relevant location of the glare they caused.Thirdly,according to questionnaire and field test data,this paper developed the attributes of influencing factors of curtain wall,which are classified into 3 categories: environmental factors,architectural form factors,material and construction factors,which were further specified into nine classes.The factors acted correspondingly on 3 building design stages: site design,architectural design and curtain-wall construction design.Finally,based on the previous research,this paper proposed a new method for reflection glare prediction,the BTA method.By computer simulations of simplified building model,this paper analyzed each influencing factor,which showed different response characteristics.Combined with design process,with urban,building and curtain construction factors considered,the strategy and guideline of glare control of glass curtain wall had been proposed.This paper conducted a quantitative research on the reflected light of the glass curtain wall,which not only proposed the basic data and research methods for the study of the curtain wall building,but also provides some reference for further design practice.