Reinforcement layout design of RC members under complex stress states based on topological optimization(PDF)
长安大学学报（自然科学版）[ISSN:1006-6977/CN:61-1281/TN]
- Issue:
- 2019年03期
- Page:
- 84-95
- Research Field:
- 桥梁与隧道工程
- Publishing date:
Info
- Title:
- Reinforcement layout design of RC members under complex stress states based on topological optimization
- Author(s):
- ZHANG Huzhi; JIANG Dian; XIE Xianzhong
- （School of Civil Engineering, Hunan University of Science and Technology, Xiangtan 411201, Hunan, China）
- Keywords:
- bridge engineering; RC members under complex stress states; structural optimization design; topological optimization; reinforcement layout design; construction requirement
- PACS:
- -
- DOI:
- -
- Abstract:
- In order to obtain a suitable reinforcement design for complexstressed members, the optimal topological reinforcement layout of it was studied. The optimal topological reinforcement 〖JP2〗was obtained by applying the separatedelements model genetic evolutionary structural optimization〖JP〗 (GESO) to the reinforcedconcrete separating model. A new method for the reinforcement layout of complexstressed members was proposed. Firstly, through simplified measures such as reinforcement decomposition, connection, and merging design, the reinforcement in the topological solution was simplified and designed, and the preliminary reinforcement layout 〖HJ2mm〗drawing scheme that was substantially improved in terms of operability was obtained. Next, some local regions were reinforced to fulfill the construction requirements of the current code, and the final design of the reinforcement layout was completed. This method was applied to the reinforcement design of five different types of complexstressed members. The utilization ratios of reinforcement and mechanical properties were compared with those of the elastic stress method and empirical method，in the case of a deep beam with two small openings in each side. The results show that the separatedelements model GESO can intuitively construct the reinforcement layout of reinforced concrete complexstressed members, but the operability of construction of the scheme is lower，and the structural requirements is ignored, which leads to the lack of safety guarantee after the redistribution of elasticplastic internal forces. The simplified design results can intuitively get the concrete layout of reinforcing bars， and the simplified design of reinforcement is clear and regular arrangement.The diagonal reinforcement is greatly simplified, the operability of the construction is enhanced, the necessary structural reinforcements that meet specification requirements are added, and the design results of the reinforcement tends to be more perfect. In the case of a deep beam with two small openings in each side, the optimal topological reinforcement is simplified according to the simplified design method. After adding 7.74% of the reinforcement amount, the preliminary reinforcement drawing is obtained. After adding 26.19% of the structural reinforcement amount, the final reinforcement drawing of the simplified design method is obtained. Compared with the elastic stress design and empirical design methods, the final reinforcement drawing reduces steel consumption by 16.24% and 35.35%, respectively. It is proven that the new method with different types of members under complex stress states not only has favorable universality, stability, and feasibility, but is also more costeffective， compared with the current design method, and can serve as a reference for the reinforcement design of complexstressed members. 1 tab, 18 figs, 29 refs.
Last Update: 2019-05-23