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研究生：	楊謹銘 Yang, Ching-Ming
論文名稱：	超高性能混凝土預力橋設計 Research on Prestressed Bridge Design for Ultra High Performance Concrete
指導教授：	朱聖浩 JU, Shen-Haw
學位類別：	碩士 Master
系所名稱：	工學院 - 土木工程學系 Department of Civil Engineering
論文出版年：	2025
畢業學年度：	113
語文別：	英文
論文頁數：	124
中文關鍵詞：	預力混凝土橋梁設計、簡支橋、連續橋、單箱室預力橋、雙箱室預力橋、超高性能纖維混凝土
外文關鍵詞：	Prestressed concrete bridge design, simply supported bridge, continuous bridge, single-cell box girder, double-cell box girder, ultra-high performance concrete
相關次數：	點閱：51 下載：6
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台灣地狹人稠、地質條件複雜，位處菲律賓海板塊與歐亞板塊交界處，地震頻繁，因此橋梁設計須同時兼顧空間限制、施工效率、耐震能力與長期耐久性管理。近年來，許多橋梁已進入老化階段，加以都市化快速發展與交通需求增加，傳統混凝土結構面臨裂縫控制不良、壽命不足與維護監測成本上升等問題。在此背景下，UHPC 提供了一種根本性的材料解決方案，可有效克服上述限制，成為未來橋梁工程發展之高效替代選項。此論文旨在探討超高性能混凝土（Ultra-High Performance Concrete, UHPC）應用於預力混凝土橋梁設計之結構效益與鋼筋減量潛力，並與傳統混凝土（Normal strength concrete, NSC）進行系統性比較。研究中首先透過一系列的材料試驗測定某特定配比下的UHPC材料參數，以UHPC替代傳統混凝土在相同的斷面、跨度、載重、橋梁型式下進行預力橋設計，進一步比較其在材料使用上的節省效果與設計表現，論文中使用的設計程式為Micro-Sap Version-III，並採用交通部出版之公路橋梁設計規範進行設計，該程式僅需輸入設計參數，即可執行橫向與縱向分析並輸出設計結果、數量統計及錯誤訊息，具備良好的自動化與分析效率，並藉由此方法研究簡支橋、連續橋在雙箱室斷面與單箱室斷面下與橋跨長度之關係。
分析結果顯示，UHPC於各橋型與斷面條件下皆展現優異之鋼筋節省效果，在大型斷面構造中，其總效益更為顯著。綜合結論建議，未來研究應進一步發展UHPC應用於橋梁設計之規範，納入長期行為與生命週期成本評估，並結合人工智慧演算法以優化材料使用與結構配置，提升UHPC在橋梁工程中的整體應用效益。

Taiwan is characterized by limited land availability, complex geological conditions, and frequent seismic activity due to its location at the boundary between the Philippine Sea Plate and the Eurasian Plate. As a result, bridge design must simultaneously address spatial constraints, construction efficiency, seismic resistance, and long-term durability management. In recent years, many bridges in Taiwan have entered an aging phase. Coupled with rapid urbanization and increasing traffic demand, traditional concrete structures are facing serious challenges, including crack control, limited service life, and rising maintenance and monitoring costs. Against this backdrop, Ultra-High Performance Concrete (UHPC) offers a fundamental material solution capable of overcoming the above limitations, presenting itself as a highly effective alternative for the future development of bridge engineering.
This study aims to evaluate the structural efficiency and reinforcement-saving potential of UHPC when applied to prestressed concrete bridge design, in systematic comparison with Normal strength concrete (NSC). A series of material tests were first conducted to determine the mechanical properties of UHPC under a specific mix proportion. Subsequently, UHPC was used to replace NSC in the design of prestressed bridges under identical conditions—section geometry, span length, design loads, and bridge type in order to assess differences in material efficiency and structural performance.
The structural analysis was carried out using the Micro-Sap Version-III program, in accordance with the Highway Bridge Design Specifications published by the Ministry of Transportation and Communications of Taiwan. With its high degree of automation, the program requires only basic input parameters and can perform both transverse and longitudinal structural analyses. It outputs design results, reinforcement quantity summaries, and error messages efficiently. This method was used to investigate the behavior of simply supported and continuous bridges with both single-cell and double-cell box girder sections across different span lengths.
The results indicate that UHPC demonstrates outstanding reinforcement-saving effects across all bridge types and section conditions, with the most significant benefits observed in large-section structures. Based on the findings, it is recommended that future research focus on the development of UHPC-specific bridge design codes, including the incorporation of long-term behavior and life cycle cost analysis. Furthermore, integrating artificial intelligence (AI) algorithms is suggested to optimize material utilization and structural configuration, thereby enhancing the overall effectiveness of UHPC in bridge engineering applications.

摘要	II
Abstract	III
Acknowledgment	V
Contents	VI
List of Tables	1
List of Figures	2
Chapter 1	Introduction	5
1	Background and Purpose	5
2	Literature Review	7
2.1	Ultra High Performance Concrete	7
2.2	Shear Behavior of UHPC Prestressed Beams	9
2.3	Flexural Behavior of UHPC Beam	10
2.4	Design Specification	12
2.5	Analysis and Design Programs	12
2.6	Summary	14
Chapter 2	UHPC Prestressed Concrete Design Specification	15
1	Introduction	15
2	Introduction to FHWA-HRT-23-077	15
2.1	Computation of Prestress Losses	15
2.2	Total Prestress Loss	16
2.3	Immediate losses	17
2.4	Long-term prestress losses (ΔfPLT)	18
3	Illustration of Highway Bridge Design Specifications	21
3.1	Computation of Prestress Losses	21
4	Comparison of Prestress Losses	24
4.1	Design Example of a UHPC Section Based on FHWA Guidelines	24
4.2	Design Example of a UHPC Section Based on Highway Bridge Design Specifications	27
4.3	Summary	28
5	Design for Shear and Torsion in FHWA-HRT-23-077	30
5.1	Shear Design	30
5.2	Torsion Design	31
6	Design for Shear and Torsion in Highway Bridge Design Specifications	32
6.1	Shear Design	33
6.2	Torsional Design	34
Chapter 3	Experimental Project	35
1	Introduction to materials experimentation	35
2	Shape of specimen	35
3	Material	36
3.1	Mixture proportion	41
4	Specimens casting	42
4.1	Preliminary preparation	42
4.2	Dry mixing	43
4.3	Casting	44
4.4	Demolding And Curing	45
5	Instrument Overview	47
5.1	Universal Testing Machine (UTM)	47
5.2	Strain and Displacement Measurement Equipment	48
6	Test setup	54
6.1	Compression test	54
6.2	Direct tension test	55
7	Analysis method	57
8	Test result	58
8.1	Compression test result	58
8.2	Direct tension test result	60
Chapter 4	UHPC and traditional methods for pre-stress bridges	64
1	Introduction of analysis methods	64
2	Design Procedure of the Prestressed Program	64
3	Material Parameters	68
4	Loading Data	69
4.1	Dead load	69
4.2	Live load	69
4.3	Impact load	71
4.4	Longitudinal (Braking) Forces	72
4.5	Wind load	72
4.6	Vehicle caused wind force on the structure	72
4.7	Thermal effects	73
4.8	Seismic design	73
5	Design Conditions for Prestressed Bridge	73
5.1	Cross Section Type	73
5.2	Vehicle location in the Transverses Direction	75
5.3	Prestressed Cable Design	76
5.4	Abutment Design	79
6	Results and Discussion	80
6.1	Simply Supported Bridge	81
6.2	Continuous Bridge	88
7	Summary	95
Chapter 5	Conclusions and Recommendations	97
1	Conclusions	97
2	Recommendations	98
References	99
Appendix A.	Input and Output Files	102
                                    

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