# Plastic Properties of Prestressed High-Strength Steel Reinforced Concrete Continuous Beams
## 5 Conclusions  
The PSRC beams with built-in high-strength steel were tested to investigate the applicability of high-strength steel in PSRC continuous beams. These results show that the PSRC beam with built-in high-strength steel has excellent structural performance. The bearing capacity of the specimen was greatly improved under the same section size. In addition, the influence of various parameters on the plastic properties of PSRC beams with built-in high-strength steel was further analyzed. These results show that reducing the steel ratio of prestressed high-strength steel reinforced concrete continuous beams can improve the plastic internal force redistribution performance of the specimen and deepen the plastic development degree of the section. Increasing the comprehensive reinforcement ratio and stirrup ratio can improve the curvature ductility of continuous beams and enhance their plastic properties. Finally, on the basis of the above plastic performance analysis, the plastic design method of a prestressed high-strength steel reinforced concrete continuous beam was proposed, and the amplitude of the bending moment was suggested. In general, this paper analyzes the plastic properties of high-strength steel prestressed concrete continuous beams and provides a plastic design method for practical application. The main conclusions are as follows:  
* Built-in high-strength steel can greatly improve the bearing capacity of PSRC beams. Compared with the bearing capacity of PSRC beams with built-in Q355 steel, the ultimate bearing capacity of PSRC beams with built-in Q460 and Q690 steel increased by 19.04% and 42.8%, respectively. In addition, by increasing the steel ratio, the bearing capacity of PSRC beams has also been significantly improved. After the steel ratio of the Q690 steel specimens increased from 2.88% to 4.55% and 5.65%, the ultimate bearing capacity of the specimens increased by 19.6% and 27.4%, respectively.
* Increasing the comprehensive reinforcement ratio and stirrup ratio in PSRC beams with built-in high-strength steel can improve the bending moment modulation ability of continuous beams. The calculation formula of the equivalent plastic hinge zone length of a PSRC continuous beam with high-strength steel was proposed.
* The moment modulation coefficient of the prestressed high-strength steel reinforced concrete continuous beam was determined, and the plastic design method of the prestressed high-strength steel reinforced concrete continuous beam was proposed. The bending moment modulation coefficient of PSRC beams with built-in high-strength steel was in the range of 0.22\(\sim\)0.34, and the calculation formula for bending moment modulation was established with the relative plastic rotation angle as the independent variable and the relative compression zone height of the bearing control section as the independent variable.
* The specimens with built-in Q690 steel and a steel ratio of 2.88% and the specimens with Q355 steel and a steel ratio of 4.55% reduced steel consumption by 36.7%, under the condition that the bearing capacity of the two was similar.  
[PERSON] proposed the topic of this study, designed the test, calculated the results according to the codes, and analyzed the data. [PERSON] conducted the experiments and data aggregation, and wrote the original draft. All authors have read and agreed to the published version of the manuscript.  
Not applicable.  
The data presented in this study are available on request from the corresponding author. The data are not publicly available due to ethical.  
The authors declare no conflicts of interest.