Abstract:Anyang Bridge of Tianjin Haihe River is a new landmark in the central business district of Binhai New Area and a perfect combination of bridge art and bridge structure. Anyang Bridge is a large-span space steel mesh arch bridge on soft soil foundation. A series of technical problems are encountered in the design of Anyang Bridge. The solution of these technical problems can provide experience and reference for other similar bridge projects.

Abstract:The sudden breaking of the boom cable destroyed the bridge, and the research is very enthusiastic, resulting in such technologies as "short boom" theory, "double boom" theory, "rust breaking" theory and "multi-boom" technology. And so on, there are many opinions, and it is applied in engineering design and accident diagnosis. Small boom, endanger the whole bridge, the problem is: the current design of bridge boom, admit the possibility of failure (probability); Techniques such as "three years of testing "," suspected disassembly ", and" replacement is complete (or batch) replacement "obviously cannot fundamentally rule out the risk of sudden cable breakage. According to the failure analysis (so-called material diagnostics), the common and even coupled action of the arch bridge derrick is multiple factors. Not a single, superficial argument can be summarized. After a brief analysis, discussion and a case study, the author holds that the above theories are flawed, may not be valid, or cannot be established at all. At last, the paper introduces the design of the boom of Xiangshuigou Bridge based on "safety technology of cable breakage", in order to clarify its technical key points and applications, and explore the way to solve the problem.

Abstract:Tianjin Haihe Bridge is an important node in the middle section of the second phase of Tianjin Coastal Expressway Jishugang Road. The main bridge adopts single-tower double-cable-plane mixed-beam cable-stayed bridge, the main tower adopts diamond tower, the main span adopts orthogonal-bridge panel steel box girder, the side span is prestressed concrete continuous box girder, and the span arrangement is 310+2×50+2×40m. The new Haihe River Bridge and the existing Haihe River Bridge are antisymmetric. It not only meets the function requirements of port evacuation, but also takes into account the overall landscape needs. This paper introduces the general design of the bridge and the key technical points in the design.

Abstract:Prestressed reinforcement is the key component of prestressed concrete structure, which is directly related to the safety, applicability and durability of prestressed concrete structure. In this paper, the corrosion degree of prestressed concrete is monitored by measuring the impedance between the prestressed reinforcement and the concrete reinforcement through a simple nondestructive testing method in post-tensioned prestressed concrete structures. The method has been tried in the 30-meter T-beam cross-sea bridge project, which makes a useful attempt for domestic popularization and application.

Abstract:In this paper, the development status of the bridge isolation bearing in China, the basic performance requirements of the bridge isolation bearing and its related performance testing requirements are studied, and the variation of the performance of the bridge isolation bearing that should be considered in the design is expounded.