Construction safety assessment is a major component of safety management in construction projects. However, thus far, most assessment studies have focused on either cross-sectional or longitudinal performance. This study aims to develop a proactive and preliminary safety assessment method using a fluid dynamics (FD) approach by integrating longitudinal contractor performance with cross-sectional safety conditions. To this end, an FD framework was first developed using three processes: (a) identifying the connections between FD principles and safety analogs, (b) incorporating the Darcy-Weisbach equation into the framework, and (c) modifying FD equations for construction safety assessment. Subsequently, two case studies were investigated, and the results obtained were compared and verified with one existing assessment results. The results indicate that the state of safety at a construction site incorporates both the occurrence of hazards and conservation of energy. Thus, the proposed FD approach can be used to preliminarily assess and predict safety conditions by combining safety-related measures with the dynamic characteristics of construction processes. The approach considers a comprehensive range of indicators and parameters, which enables the comparison of safety performance between projects or assessment periods by independently changing parameters.

施工安全评估是建设项目安全管理的重要组成部分。但是，到目前为止，大多数评估研究都集中在横截面或纵向性能上。这项研究的目的是通过将纵向承包商的绩效与横截面的安全条件相结合，开发一种使用流体动力学（FD）方法的主动和初步的安全评估方法。为此，首先使用三个过程开发了FD框架：（a）确定FD原理与安全类似物之间的联系，（b）将Darcy-Weisbach方程纳入框架，以及（c）修改FD方程以确保施工安全评估。随后，对两个案例研究进行了调查，并将获得的结果与现有的一项评估结果进行了比较和验证。结果表明，建筑工地的安全状态兼顾了危险的发生和能源的节约。因此，通过将安全相关措施与施工过程的动态特征相结合，所提出的FD方法可用于初步评估和预测安全状况。该方法考虑了广泛的指标和参数范围，从而可以通过独立更改参数来比较项目或评估期之间的安全绩效。