Study On The Construction Design Theory And Methods Of Steel Plate Shear Wall With Openings

Through tests under actual severe earthquakes, steel plate shear wall is proved tobe one of the best anti-seismic structure systems. But sometimes in order to satisfyarchitectural funtions., various openings are inevitable.So in this paper, the mechanicalperformances of various thin wall shear walls with openings are investigated. Mainpoints in this paper include:1. According to the position of openings,all existing steel plate shear walls withopenings are classified into four types: SW-Ce, SW-Be, SW-Bo and SW-Co.First of all,differences are researched between shear wall with edge members and that withoutedge members.By comparing their ultimate bearing capacity and ductility, we canjudge whether edge members are necessary. With the help of classical mechanics, thispaper researches the stressing situation of edge members in SW-Ce. Then this paperextendes the classical results to other types of shear walls with openings. In the end,the strength calculation method for edge members is summarized.2. Exact models of the former4kinds of steel walls with opening are built byFEM to simulate of the force of steel walls with different openings. The static analysispoints out that, in additional to the factors of normal steel walls, the horizoantleccentricity （η₁） and the horizoantl opening rate （η2） are the most important factorswhich affect the performance of steel walls. A large number of examples show that theformer two factors are proportional to the ultimate load and the ductility of walls.3. In order to find out the effect of welding to Steel Plate Shear Wall withOpenings in construction, different stress and deformation in strucure caused bydifferent welding process are studied. An optimum welding process is obtained in result and a technique that can decrease the welding effect is proposed simutaneously.It is tested that the cultimate shearing load decrease by5%considering the weldingeffect and the structure ductility decreased considerably. So the welding effect can notbe ommited in loading of steel plate shear wall with openings. Considering the steelplate wall is built at the same time with structure or lagged behind, the steel plate wallis prepressed for the axial pression in structure, and the prepression caused byconstruction process is equal to the intial defect through the analysis of maximumstorey compression ratio in steel plate shear wall with openings.4. Capareing the results of the4kinds of steel walls with the one without openingunder the same condition, it is found out that, the ultimate load of walls with opening ismuch larger than normal walls without opening because of the edge members, andmore edge members means higher ultimate load. However, the ductility reduces withedge members for the ductility of normal walls is much better than that with openings,besides, the stress-strain curve of walls with opening decreases clearly while thenormal walls do not.5. Additional steel plates next to the opening are needed to impove resistanceability of horizoantl shear force, and the formula is proposed at the same time. A largenumber of examples show that resistance ability of horizoantl shear force is notreduced because of additional plates, which provide the base of steel walls of openingmodel （USMO）.6. The edge members are very important in the model of steel walls, which have adirect effect to the ultimate load and ductility. Edge members with high stiffness willlead to high seismic effect and brittle damage, while ones with low stiffness cannotprovide enough anchoring force, which is an important cause of the tension beltformation of infill plate. Through studying these parameters, the effect of edgemembers to the initial stiffness of components could be proposed, which can be used tofind the resist-horizoantl-force ratio of edge members and economic scope of stiffness.It is found that the best scope of stiffness ratio is I_c/I_co=6⁸.7. Investigating for the best USM model and considering the influence of edgemembers for the ultimate strength and ductility for the steel shear wall with holes，Imodified the USM model and advanced USMO model.The two models are all made upof the shear field and the tension field. The only difference between the USMO and theUSM model is the compression bar in the tension field.The compression bar simulatesthe increasing ultimate load and the decreasing ductility for the adding of edgemembers，and the shear field doesn’t change for the strengthening of the minimum safe thickness panel.8. Investigating for the nonlinear monotonic and cyclic analysis of the steel shearwall with openings，the analysis results hasn’t the shrinking phenomenon.And theresult shows the influences of many parameters for the uniqueperformance.Investigating the Energy dissipation coefficient and Strength degradationcoefficient，I advanced the skeleton curve for the steel shear wall with openings.9. Analyzing the hysterrisis curve，there are two types of failure models.The firstmodel is ductile failure， and the second model is lag ductile failure. Aftercomprehensive analysis for the two failure models，the project should adopt the firstmodel and avoid the second model on the basis of multi-channel seismic fortificationconcept design.10. A one-bay12-story steel shear wall model with openings has been carried outto demonstrate the unique performances，and the model meets various design indexs.The model is analyzed by elastoplastic seismic time-history analysis under threepractical seismic waves to demonstrate the reliability. And the lateral displacement ofthe top floor show that the model is in acceptable reliability level.The research offers valuable datas and references for the theory research andseismic design of the steel shear wall.