| A new structural system of steel dwelling houses applied in multiple and high-riseresidence building is proposed, called steel grid box-like structure with gypsum wallcast-in-place (SGBSG). It conforms to our country situation of changing economicmode, and solves the problems restricting steel house development for years. Thissystem has a lot of promotion and development prospects for multi advantages suchas good structural properties, powerful architectural function, energy conservation,environmental protection and circulation of industrial wastes.In the beginning, the development status and the advantages and disadvantages ofthe residence with steel structure are summarized, and the sub-systems andconstruction styles of SGBSG are introduced. And then, a series of research topics areput forward including: the basic mechanical properties of sub-system, bondperformance and slip mechanism between steel grid frame and gypsum, value ofstructural influencing coefficient and combined technical performance.The construction features of Steel Vierendeel grid slab structure (SVGSS), whichis the horizontal sub-system of SGBSG is introduced. Based on the principle ofcontinuous analysis, the basic mechanical equation in consideration of sheardeformation is established and the analytic solution is gotten under boundarycondition simply supported on four sides. Practical analysis method and its calculationkeys are presented for the design of SVGSS. According to a calculation example, acomparative research of results of continuous analysis, FEM analysis and practicalanalysis proves that the continuous analysis has good accuracy and the practicalanalysis method has high safety and good feasibility used in actual engineering.The reason of lateral stiffness improvement of steel grid frame wall (SGFW),which is the vertical sub-system of SGBSG, is studied by using the structuralmechanics theory of framework effect. D-value method and flexibility method arerespectively used to calculate the shear deformation of SGFW. The flexuraldeformations are obtained with Isolation-unit Method. The results comparison withFEM analysis shows that the results of D-value method are relatively small, the actualengineering should use flexibility method, and the flexural deformation is obvious.With Pushover method, the seismic property of SGFW and steel frame are studied,and the results show that the lateral stiffness and seismic property of SGFW are better than steel frame.In order to determine the relations between the three main bond-anchoring factorsincluding gypsum strength, gypsum cover thickness and steel embedment length andthe bond strength, and establish the bond-slip constitutive relations,18standardpush-out test specimens were designed. The whole push-out test processes were fullyobserved. The first cracking and cracking development and the final failure modewere carefully observed. Based on the summary of the characteristics of load-slipcurves and bond stress-slip curves, the bond-strength calculation formulas andbond-slip Constitutive Model are determined.The necessity of study on structural influencing coefficient in the current seismicdesign methods is explained. The idea and method of research on the structuralinfluencing coefficient of SGBSG are introduced. Using this system,6models ofdifferent stories and different span are built to calculate the structural influencingcoefficient. The results show that the value of structural influencing coefficient ofSGBSG is3, which is bigger than the regulation value2.86in the current seismicdesign code of our Country.According to a high-rise residence with15stories, two different models are builtby respectively using SGBSG and steel frame-shear wall. The study of period,displacement, internal force distribution and combined technical performance areconducted between these two models. The results show that SGBSG has someadvantages in several indexes. |
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