Researches On Key Aspects Of Wallboard Prefabricated Steel Residential System

In recent years, our country has been constantly promoting the urbanizationconstruction, which provides a good opportunity for the realization of residentialindustrialization and the development of prefabricated steel residential system. Based onthe merits of the existing prefabricated steel residential system at home and abroad, thisarticle proposes a new wallboard prefabricated steel residential system that is suitablefor multi-floor and high-rise residences. This system is composed of combined stressedwallboards, non-stressed wallboards and integrated floor slabs, and possesses the meritsof parts standardization production, high integration, no on-site welding operation, highconstruction quality, good comprehensive economic benefits, etc.This article targets at the new wallboard prefabricated steel residential system aswell as its key technology, and carries out a comprehensive study from the aspects ofstructure form, maintenance material, joints construction, seismic performance, etc.Detailed work and conclusions are as follows:1) Through the design of a multi-floor residence, the composition of the newwallboard prefabricated steel residence system and the features of its supportingtechnologies are briefly introduced from the macroscopic aspects of structuralarrangement, forms of prefabricated parts, process of construction joints, structuralperformance as well as economic index.2) By using the finite element analysis software ABAQUS, corresponding staticpush-over analysis and elastic-plastic analysis of cyclic loading were conducted on thesingle-cross prefabricated steel framework, and the load-displacement curve as well asthe stress/strain distribution were obtained for the structure. The results show that under the designed load, the structure is in the elastic state and has sufficient safety reserves.Under the ultimate load, the plastic hinge of the structure first appears in the end of thesupport and girder chord, which basically satisfies the design requirement of “strongcolumn weak beam, strong joint weak components”. The structure has large anti-lateralstiffness and small lateral displacement at elastic deformation stage, but the bearingcapacity drops rapidly after it enters the plastic stage. The slenderness ratio of thesupport and the flakiness ratio of the underlying column should be strictly controlledduring the design in order to avoid the structural failure due to excessive localized stressor localized deformation of parts and to ensure the late bearing capacity and ductility ofthe structure.3) The plug-beam-column joints technique is studied for the realization of on-sitestructure assembly and is one of the key supporting technologies of the new wallboardprefabricated multi-floor and high-rise steel residential system. It not only connects theup and down columns but also connects the beam and columns, which separates thebuilding layers and avoids problems such as transportation difficulty and lowtransportation efficiency caused by the large sizes of the prefabricated parts. In thisarticle, the bearing capacity, stress distribution and flexural rigidity of the plug-in jointsare analyzed by utilizing the finite element analysis software ABAQUS. The resultsindicate that the joints can reliably deliver the column axial force, which satisfies thedesign requirement of “strong joints weak components”. The joints belongs to thesemi-rigid type, which not only can deliver the column axial force but also can bear thebending moment. In the case of dense columns at the peripheral of the structure, it canbe used as the2ndseismic fortification measure in addition to the supporting parts.The research output of this article plays an important role in boosting thedevelopment of new wallboard prefabricated steel residential system and provides thetechnology foundation for the future application and development of the system.