Abstract:Wuhan Yangluo Yangtze River Bridge main bridge is a main span 1280m suspension bridge, the north anchorages using sloping large excavation deep buried expanding the foundation of the solid belly anchor weight force type anchor; South anchorages using support excavation deep buried circular expanding the foundation frame anchor weight force type anchor, the pit project using the outer diameter of 73m, wall thickness of 1.5m, depth of 61.5m, the maximum excavation depth of 45m circular diaphragm wall plus liner of the support structure type; in the The first time in China to use "non-bonded replaceable" prestressing anchorage system. This paper summarizes the overall structure of the anchor, pit (foundation) engineering, structural design and technical characteristics of the anchor body and anchorage system.

Abstract:In the construction of prestressed concrete cable-stayed bridges, the control of geometric line and structural internal force is very important, according to this, in recent years, China's new progress in this regard, the application of modern engineering control theory in the idea of adaptive control to form a control system, which is mainly in the structural parameter identification and cast-in-place main girder elevation of the bottom mold of the real-time correction of the key technology breakthroughs, and after several large-span prestressed concrete cable-stayed bridges in the practice of the success of the experience achieved!

Abstract:The rib-ring type cable dome is a new type of pre-tensioned structure developed by American engineer Geiger according to Fuller's idea of tensile monolithic structure, and it was firstly applied in the gymnasium and fencing hall of Seoul Olympic Games. Considering that the structure is an axisymmetric structure, this paper proposes a fast calculation method to determine the initial prestress distribution. The method starts from the nodal equilibrium relationship of plane radial trusses and derives a generalized formula for the internal force of prestressed rods in rib-ring type cable domes without and with internal tension rings. Tables for the calculation of internal forces are also given for cable dome structures with specific parameters. With the analytical methods, formulas and tables provided in this paper, the initial prestress distribution of rib-and-ring type cable dome structures can be determined easily and quickly, which provides a basis for further design and mechanical property analysis of this type of structures.

Abstract:It is proposed that in the multi-storey building with medium and large opening at the bottom (or small-span heavy load), priority should be given to the use of profiled concrete conversion beams and its profiled concrete structural system with large opening at the bottom, and for the high-rise and ultra-high-rise buildings with large opening at the bottom, the profiled concrete structure and prestressed profiled concrete hollow web truss conversion structural system can be used. To this end, the vertical load and low peripheral repeated horizontal load comparison tests of beam-type joist conversion structure with large bottom opening of section steel concrete and the corresponding structural model of ordinary reinforced concrete, as well as the vertical load and proposed dynamic comparison tests of pre-stressed section steel stacked hollow truss conversion structure with section steel concrete and the corresponding structural model of ordinary reinforced concrete are carried out, and some design suggestions for the structural system of section steel concrete bottom opening and conversion floor are put forward. Part of the design suggestions for the structural system of the conversion floor have been made, and fruitful results have been achieved. The research results of this paper have been successfully applied to three actual projects, which have achieved remarkable social and economic benefits.

Abstract:Chaobai River Bridge is a three-tower single cable-stayed prestressed concrete partially cable-stayed bridge. This paper mainly introduces the structural system and structural characteristics of this bridge, and describes the structural advantages, current situation and development of partially cable-stayed bridges with the characteristics of this bridge.

Abstract:This paper introduces the development process of OVMAT cable-stayed short tower cable-stayed bridge by taking Fujian Zhangzhou Battle Reserve Bridge and Lanzhou Xiaoxihu Yellow River Bridge as examples. The split-wire technology is used to solve the deficiencies of the original cable-stay system saddle and anti-slip anchors, and the optimized design of the beam-end anchorage is combined with the characteristics of the short tower cable-stayed bridges, and the corrosion and water-proofing of the cable-stayed bridges are well solved.

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