Study On Comfort Optimization Of Open Underground Intermediary Spaces In TOD Complexes In Chongqing,China

Urban development on rail transit and the promotion of Transit-Oriented Development(TOD)have become important components of China’s 14 th Five-Year Plan.The construction of TOD complexes can help alleviate many of the problems brought about by rapid urbanization.The underground intermediate space,serving as the transportation hub and an important node in the TOD complex,provides users with direct visual and sensory experiences,and creates bonds among various unrelated spaces,functioning as the "living room" of the TOD complex.However,there are some issues in the existing underground intermediate space of TOD complexes,such as a sense of enclosure and poor clarity of speaking,which contradict the concepts of high-quality and landmark construction.Additionally,the physical environment of the open underground intermediate space is not coordinated,and the current research lacks overall environmental control,making it difficult to optimize the space in new designs.Therefore,this thesis followed the logic of overall design-theoretical integrationenvironmental evaluation,analyzed the objective factors that make the underground open intermediate space in TOD complexes significant,the theoretical application in practice,and the evaluation methods of overall comfort.Furthermore,based on data analysis from over 200 rail transit stations and in-depth research on more than 30 TOD complexes,the thesis analyzed and summarized the characteristics of four types of TOD complex underground intermediate spaces in Chongqing and sorted out the influencing factors on the physical environment of the space.Then,the thesis combined the research data with simulation conditions to set up an experimental scheme,verify the simulation results,and propose optimization strategies.The specific contents of the research include four points: first,based on the development of rail transit in Chongqing and field research,the thesis measured research parameters on existing bases,summarized spatial elements,and classified and summarized existing TOD complexes.Second,according to the research data,the thesis established four standard models of underground open intermediate space for TOD complexes in Chongqing and set the boundary conditions for the simulation model according to usage and simulation conditions.Then,on the premise of ensuring accuracy,the thesis used an orthogonal table to reduce the number of experiments and simulated the results of different categories of TOD complex underground open intermediate spaces in the physical environment using the Ecotect tool,verifying the credibility of the results through data collection and statistical analysis.Finally,the thesis sorted out the experimental data,compared the optimal and worst combinations,found the optimization rate for targeted and comprehensive optimization,analyzed the ranking order of the factors,and explained the reasons for the results.This provides the basic rules for the underground open intermediate space in the early stages of building design and helps designers quickly choose different influencing factors and different levels of factors in actual engineering projects,improving design requirements and reducing design costs.The results include three aspects: the establishment of a standard model of underground open intermediate space for TOD complexes in Chongqing,the proposal of theoretical design strategies for single-objective optimization and overall optimization of the physical environment,and optimization suggestions that meet the applicable standards by comparing simulation results with indoor environmental regulations.