地块容积率对路网密度指标的影响分析

基于供需平衡理论,修正路网密度和级配最优化计算模型，以济南市某高密度高强度开发的区域地块为基础，构建一般地块分析模型，标定各种计算参数，以平均容积率为唯一变量，进行容积率对路网密度和级配的影响分析。在城市平均的出行模式下，研究发现容积率的大小变化对路网密度指标的影响分三个层次。当平均容积率小于等于3时，采用95规范推荐的路网密度和级配可以获得较好的交通供给。当平均容积率在3-5时，在规范推荐值基础上加大各等级道路密度和道路面积率来增加交通供给，但无法获得合理级配。当平均容积率大于5时，按照现有规划方法无法得到满足需求的路网密度和级配，必须同时采取交通需求管理才有效。

Exploring floor area ratio impacting on urban road network density

The supply-demand balance optimization model was modified, a general urban land use analysis model established based on a high density and high intensity district in Jinan, China. Floor area ratio (FAR) as the only variable was remained in the model formula after calibrate other parameters in Jinan city. Comparing to the current standard published in 1995, there are three levels describing how FAR impacts network density index. All the analysis was carried out under the same traffic mode in Jinan city. First, if the average FAR is less than or equal to 3, a reasonable traffic supply will be got using the road network index recommended in the standard. Second, if the average FAR is more than 3 and less than 5, increasing the road network density and road area ratio can match the demand at the expense of bad road hierarchy. At last, if the average FAR is more than 5, there is no calculating results from the model which means the current planning method is failed and comprehensive strategies such as traffic demand management are required.