Abstract:In the actual construction process, there are many factors that affect the alignment and structural perfor-mance of bridges, and their influence on bridge structures should not be underestimated. This paper conducts a simulation analysis of a large-span hybrid girder rigid frame bridge using Midas/Civil2020. Deflection values in the completed state are used as evaluation criteria. Sensitivity analysis is performed on construction control parameters such as the self-weight of the girder, girder stiffness, prestressing pa-rameters, environmental temperature, and unbalanced basket weight. This analysis determines the degree of influence of these parameters on the bridge structure, providing a basis for bridge monitoring during actual construction and offering relevant monitoring recommendations.

Abstract:In the design scheme of a bridge with external prestressing tendons and hybrid internal and external tendons, the internal tendons can bear the load in cantilever casting construction, the external tendons can bear the superimposed dead load and the service load, and the external prestressing tendons are easy to inspect and replace in the service stage. However, in the design of prestressing tendons and hybrid tendons, different tendon arrangement schemes will lead to differences in the layout and number of internal and external prestressing tendons and determine the stress state of the bridge. This paper optimized different tendons in an engineering project during the construction process based on the principle that the internal tendons bear the load in the construction stage while the external tendons bear the superimposed dead load and the service load, highlighted the arrangement schemes of different internal prestressing tendons and the corresponding design of external prestressing tendons, and determined the final bridge design scheme and bridge stress state. The relevant design process can provide references for similar prestressed con-tinuous girder or continuous rigid-frame bridges with hybrid tendons.

Abstract:Accelerated Bridge Construction (ABC) has led to the widespread adoption of Deck Bulb Tee girder (DBT) in bridge engineering. Nevertheless, the use of DBT girders in large-span and intercontinental bridges re-mains restricted due to structural design limitations and material constraints, resulting in joint issues and affecting structural performance. Therefore, this paper aims to summarize typical technical improvements in the structural design of DBT girders, including addressing longitudinal joints issue and exploring the use of Ultra-High Performance Concrete (UHPC) for bridge applications. The results indicate that application of UHPC effectively addresses several technical challenges associated with DBT girders, presenting both new opportunities and challenges.

Abstract:Using carbon fiber reinforced polymer (CFRP) plates is currently an effective technique for bridge rein-forcement. This study fully introduces a dynamic performance test of a bridge reinforced with prestressed CFRP plates, including a structural modal test, moving vehicle test, braking test, and bumping test. The dynamic displacement, dynamic strain, and related impact effects of the structure were monitored, which demonstrated the high effectiveness of prestressed CFRP plates in reinforcing bridges. Relevant findings and data provide a reference for the dynamic testing of similar bridges.

Abstract:The long bridge over the Mingyue Qujiang River in Guang'an, Sichuan, China is a prestressed concrete partially cable-stayed bridge with a main bridge span arrangement of (110+210+110) m constructed with a pier-girder-tower fixed system. The girder features a single-box three-chamber section, measuring a width of 23 m, a height of 7.5 m at the main pier top, and a height of 1.6 m at mid-span. The girder is reinforced with prestressed steel bars in three directions and constructed using the cast-in-place cantilever method. The main tower is a reinforced concrete structure with a rectangular cross-section and a height of 32.05 m. The bridge has a total of 56 pairs of stay cables in a single plane. Sleeve cable saddles are adopted with two-way anti-slip keys arranged on both sides of tower wall. The findings in this study serve as a reference for the design of similar projects in the future.

Abstract:The cable-stayed bridge on Xuefu Road is a single-pylon spatial double-cable-plane cable-stayed structure with a main span of 160 m. The main girder is a PK-section flat steel box girder, while the main pylon is made from reinforced concrete. With a width ranging from 46.1 to 57.5 m, it is currently the widest sin-gle-pylon cable-stayed bridge with steel box girder in China. A comprehensive review has been conducted on the structural design and static analysis of the cable-stayed bridge on Xuefu Road, which can provide a reference for future projects of a similar nature.

Abstract:The Jingzhan·Shahe Bridge in Liyang City is located in the Tianmu Lake scenic area of Liyang, Jiangsu Province. It is an essential part of Liyang City's No. 1 tourist highway in Jiangsu Province. Surrounded by mountains and water with shimmering waves, the design of the bridge is inspired by the landscape. The main structure of the bridge adopts a "Mountain-Steel Arch" and "Water-Winding Bridge Surface" concept, reflecting the green mountains and clear waters of Liyang. It resonates with the theme "Natural Harmony in Liyang", showcasing Liyang's cultural confidence and creating a unique "business card" for the city.

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