| The construction industry is one of the important parts of our national economy.Compared with developed countries,construction industry of China is still based on on-site construction,which is characterized by low industrialization and construction efficiency,high pollution and overall energy consumption,and uneven building quality.By promoting the industrialization of buildings,these serious problems caused by on-site construction operations can be effectively avoided.As an important aspect of building industrialization,prefabricated buildings have entered a stage of rapid development in recent years under the guidance of the national prefabricated building development plan and incentive policies.In the construction of high-rise residential buildings,shear wall components have numerous longitudinal reinforcements and horizontal reinforcements,fabricated reinforcement concrete shear wall components and fabricated steel-concrete composite shear wall components have a good deal of splice joint,which is time-consuming,laborious,and calling for higher requirements for on-site construction equipment and personnel.Therefore,the development of a prefabricated shear wall structure system,with simple splice joint and good seismic performance,that can be applied to high-rise residential buildings is an important way to promote building industrialization and residential industrialization,and is consistent with the overall development strategy of China.Based on the background mentioned above,this paper proposed a new type of steel-concrete composite shear wall structure system(Partially Encased Steel-Concrete Composite Shear Wall System,PECSW system for short),which is convenient for assembly construction.The basic unit of the system,PEC composite shear wall component had been systematically tested and theoretically studied.The main contents are as follows:1.Four representative full-size single-span PECSW specimens were designed and loaded to obtain the hysteresis curve and skeleton curve.Through quasi-static loading tests,the seismic performance of PEC composite shear wall members(PECSW members),which are the key members to bearing horizontal and vertical loads in the structural system,was explored.2.In order to establish the finite element model of PECSW member,the loading fearure of the concrete part in PECSW members were analyzed,and the constitutive model for the concrete material used in the FE model of PECSW member was proposed through theoretical study,derivation and simplification.3.For exploring the mechanical performance of PECSW component reliablly and systematically,several details of establishing the FE model of PECSW members are explored and compared,such as: the material constitutive relationship,the size and type of elements,the interaction relationship between the contact surface of steel and concrete,boundary conditions and so on.Finally,a reasonable FE model with consideration of calculation accuracy and calculation time is determined.The reliability of the modeling method is verified by comparing the calculated results of the finite element model obtained by comparison with the experimental results.4.Based on the proposed finite element model,the stress of PECSW members during hysteretic loading was analyzed,and the formula for calculating the horizontal bearing capacity of PECSW members was given.5.Parametric study was conducted to explore the effects of thickness of steel bones,material strength and axial compression ratio on mechanical properties of PECSW members.6.In order to meet the need of elastic-plastic analysis,the second group of quasi-static loading tests of PECSW members were carried out.The hysteretic restoring force model of PECSW members was obtained by sorting out and fitting the test data.7.In order to explore the reasons for the large difference in positive and negative horizontal bearing capacity of S4 specimen with web holes,and to study the distribution of residual stress caused by cutting and welding heat in narrow plates,thermo-mechanical coupling analysis of cutting and welding process was carried out for the calculation unit,composed of the plates which were at the critical stress position of the PECSW members.The magnitude and distribution of thermal residual stress in PECSW steel bone were evaluated,and the influence of thermal residual stress on PECSW mechanical properties was analyzed.8.The problems requiring further studies were discussed. |
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