Impact of heterogeneous reuse on heritage value under the perspective of scale subdivision - Two modern theatres in Nanjing as examples

Heterogeneous reuse is a type of reuse where the demand for new functional space differs significantly from the supply of the original space. It causes changes in the building morphology at all scale levels, which in turn has an impact on heritage value. Heterogeneous reuse is prevalent in the conservation of modern Chinese architecture, this article analyses the mechanism of heritage value change under different intervention methods, taking the Shengli Theatre and the Dahua Theatre in Nanjing as examples. Firstly, the value-bearing areas are identified by overall value assessment; secondly, the value of each value-bearing area at each scale level is determined by combining the theory of scale subdivision; Thirdly, influences of different interventions on the value of overall building and the value bearing parts are calculated by comparing the value changes before and after conservation and renovation. This research reveals that heterogeneous reuse often leads to a decline in the emotional and cultural value of built heritage, but enhances the use value. The overall value may also increase if done in appropriate ways. Through this article, the potential of typomorphology in the study of heterogeneous reuse is expanded, and through the integration of scale subdivision and value assessment, the specific heritage values at each scale level can be fine-expressed, while the effectiveness of various interventions can be reasonably evaluated.