Unfavorable wind comfort and intense thermal discomfort are degrading pedestrian comfort in high-density cities. The lift-up design has proved to be a promising way to improve wind comfort and thermal comfort around buildings. Previous studies have identified building height as a crucial factor influencing wind comfort around lift-up buildings. However, the correlation between building height and wind comfort has not been fully understood yet and few parametric studies have been focused on thermal comfort. This study thereby aims to evaluate the integrated effects of building height and upstream building on pedestrian comfort around lift-up buildings from aspects of wind comfort and thermal comfort. Computational fluid dynamics (CFD) simulations were performed to reproduce mean flow fields around single building models and double building models. An integrated method combining on-site observation data and CFD simulation results was employed to calculate physiological equivalent temperatures. The findings show that increasing building height, being under a diverging flow, removing upstream buildings, and making the target building taller or shorter than the upstream building can improve wind comfort in the lift-up area. However, their effects on thermal comfort vary seasonally. For improving wind comfort and thermal comfort in the podium, making the target building taller or shorter than the upstream building or under a diverging flow is beneficial; but increasing building height and removing upstream buildings are not necessarily favorable. The outcome can provide some inspiration for city planners to improve pedestrian comfort in high-density cities.

在高密度城市中，不利的风舒适性和强烈的热不适感降低了行人的舒适度。提起设计已被证明是改善建筑物周围的风舒适性和热舒适性的一种有前途的方法。先前的研究已将建筑物高度确定为影响高举建筑物周围风舒适度的关键因素。但是，建筑物高度与风舒适性之间的相关性尚未完全了解，很少有参数研究集中在热舒适性上。因此，本研究旨在从风舒适性和热舒适性的角度评估建筑物高度和上游建筑物对抬高建筑物周围的行人舒适性的综合影响。进行了计算流体动力学（CFD）模拟，以重现单个建筑物模型和双重建筑物模型周围的平均流场。采用现场观测数据和CFD模拟结果相结合的综合方法来计算生理等效温度。研究结果表明，增加建筑物的高度，使其处于分流状态，将上游建筑物拆除，并使目标建筑物比上游建筑物高或矮，可以提高举升区域的风舒适度。但是，它们对热舒适性的影响随季节变化。为了提高讲台上的风舒适性和热舒适性，使目标建筑物比上游建筑物高或矮或在分流的情况下是有益的；但是增加建筑物的高度和拆除上游建筑物不一定是有利的。这一结果可以为城市规划者提供一些启发，以改善高密度城市中的行人舒适度。