Abstract:This paper mainly expounds the basic situation of application and development of prestressed long-span spatial steel structures in China. These structures include prestressed space truss structures, cable-stayed lattice structures, dome structures, beam string structures, bow-type prestressed steel structures, etc. Finally, the paper looks forward to the prestressed spatial steel structures in the new century.

Abstract:This paper introduces the planar prestressed cable net structure and its mechanical behavior. Taking a 30×30m prestressed cable net as an example, the structural deflection and cable tension under various load cases are calculated. The method for determining member prestress considering temperature loads is presented, and the construction sequence is briefly introduced.

Abstract:Applying prestress in reticulated shells can effectively adjust internal forces of members and ball joints, reduce structural deformation, and balance horizontal thrust at supports. Combined with engineering practice, this paper introduces the layout forms of prestressing tendons in reticulated shells and related prestress design and construction technologies.

Abstract:This paper introduces the unbonded post-tensioning prestress construction technology applied in coal storage silo cylinders of Guizhou Nayong Power Plant, including prestressing tendon layout, tensioning and partial analysis process.

Abstract:This paper briefly introduces the relevant parameters of post-tensioned prestress engineering for nuclear power plant containment vessels, including main equipment and material usage, duct friction tests, grouting tests, installation and testing of monitoring systems, containment strength and sealing tests, as well as on-site construction organization and quality control.

Abstract:The prestress engineering of Daya Bay nuclear power plant reactor containment vessel adopts the French standard Freyssinet Monogroup system, with steel strands composed of 19 or 36 T16 wires threaded through rigid or semi-rigid ducts for post-tensioning. The containment prestress is divided into three systems: horizontal, vertical and dome. The horizontal direction uses 360° full circumferential layout, and strand tensioning must follow strict sequence. To prevent strand corrosion, slow-setting cement grout is injected into ducts after tensioning.

Abstract:This paper introduces the comprehensive application technology of unbonded prestressed concrete in industrial plant structures, briefly describing design features, construction key points and technical-economic evaluation of long-span ultra-long 141m continuous beams, wide flat beams, counter-beams, slab structures, etc.

Abstract:This paper focuses on the design and construction technical measures of large-span frame beam prestressed structure in Baoan Gymnasium training hall.

Abstract:Based on comprehensive research results, especially through eccentric compression tests of prestressed masonry columns and low-cycle reversed loading tests and design analysis of prestressed masonry walls cited in reference [1], this paper summarizes experience on prestressed masonry construction details and construction practices for future reference.

Abstract:This paper discusses four types of cracks: principal tensile diagonal cracks, vertical cracks, longitudinal cracks and bottom concrete splitting, analyzing their causes in detail including design causes and construction causes, and proposes preventive measures and strengthening measures.

Abstract:This paper expounds the characteristics, applications and development prospects of dry jet mixing technology and its construction machinery, and explains the necessity of developing advanced and practical powder spraying pile drivers.