# Safety Risk Assessment of Highway Bridge Construction Based on Cloud Entropy Power Method
## 5 Conclusions  
Highway bridge construction risk evaluation is an important part of bridge construction, and it is therefore of great significance to propose a scientific and effective highway bridge construction risk evaluation method for the construction safety and normal use of bridges. In this paper, with reference to the literature, we use the cloud entropy power method to evaluate the construction risk of a bridge, and the main conclusions are as follows:  
1. Referring to the relevant standards and specifications, this paper decomposes the highway bridge construction risk sources into four first-level risk indicators--personnel risk, material and equipment risk, construction environment risk, and construction technology risk--and selects personnel quality, organizational completeness, construction management strength, temporary structure safety, construction material error, material and equipment stacking, machinery failure, geological conditions, climatic and environmental conditions, and natural disasters. Then, the cloud entropy weight method was used to objectively assign weight to each risk indicator, and was compared to the traditional weighting method.
2. To determine the evaluation level of highway bridge construction risk factors, the evaluation criteria and evaluation data were transformed into a cloud model, and the forward cloud generator was used to generate and compare a comprehensive cloud map and a standard cloud map. Then, the closeness N between the two maps was calculated to comprehensively determine the bridge construction safety risk levels as follows: personnel risk B1 (level 4), material and equipment risk B2 (level 4), construction environment risk B3 (level 4), construction technology risk B4 (level 4), and overall construction safety risk (level 4). The method proposed here was also combined with the AHP-Extenics method to perform a comparative study, and the assessment results are consistent, which proves that the cloud entropy weight method can be used in the evaluation of highway bridge construction risks with certain scientific validity.  
3. This paper evaluates the construction risk of highway bridges. Since there are many risk factors affecting bridge construction safety, this paper only selects four primary risk indicators and twelve secondary risk indicators that are more common and have a greater impact on construction safety. There are shortcomings in many aspects, such as the number and importance of the evaluation indicators selected. Therefore, it is necessary to conduct more in-depth exploration and research on the risk assessment of highway bridge construction, in order to move forward in the direction of sustainable development.  
Conceptualization, J.Z. and J.F.; Data curation, Q.L. and J.F.; Investigation, Q.L.; Methodology, J.Z.; Resources, Q.L. and J.Z.; Software, Q.L. and J.F.; Supervision, J.Z.; Validation, Q.L.; Visualization, J.F.; Writing--original draft, Q.L. and J.F.; Writing--review and editing, J.Z. All authors have read and agreed to the published version of the manuscript.  
This research received no external funding.  
Not applicable.  
The authors declare no conflict of interest.