| Tuned Mass Damper(TMD)is the main facility for seismic and wind resistance control of building structures.The adaptability of structural system frequency and control parameters plays a decisive role in the control effect.The influence of the superstructure makes the TMD-structure vibration control disconnected from the actual engineering situation,and the traditional TMD design is mostly rigid connection between the TMD device and the controlled structure.The designed TMD is inconvenient to assemble and disassemble,and the parameters cannot be adjusted flexibly.Detuning will occur and affect the shock absorption effect.This paper uses PKPM software to design a prototype three-story reinforced concrete frame structure.Based on the disciplines of structural dynamics,seismic engineering,geotechnical mechanics,etc.,through the method of combining experimental research and numerical calculation,systematic researches were carried out on the construction of TMD facilities,theoretical calculation method,model test and optimization of TMD parameters considering SSI effect.In-depth research,which is of great significance for further promoting the in-depth research of TMD control and its application in practical engineering.This paper mainly discusses the following aspects,and the main research results are as follows:(1)This paper designs an assembled wall-type shock absorption TMD,which is the first attempt to apply the concept of replaceable components to the design of the assembled wall-type shock absorption TMD,so that the non-load-bearing wall can add the shock absorption characteristics of the TMD device,and at the same time the assembly The structure can realize the timely replacement of TMD accessories,make full use of the existing quality of the wall,save the use space,and have broad application prospects.(2)The wall-mounted shock absorption TMD is different from the motion characteristics of the traditional suspension shock absorber.In order to more accurately analyze the dynamic characteristics of the wall-mounted shock absorption TMD,this paper uses the principle of Lagrangian mechanics to deduce from the perspective of energy.The differential equations of motion of the assembled wall-mounted damping TMD under several different motion forms(translation,swing,and translation-oscillation mixed motion)theoretically prove the damping principle of the wall-mounted damping TMD,and are the TMD parameters at the same time.Find the best foundation.(3)The three similarity theorems in the seismic simulation shaking table test are summarized in detail.The strength model is selected as the test model,and the three-story single-span frame structure with the similarity ratio of 1/10 is selected as the model.In order to further improve the accuracy of the shaking table test,combined with the research purpose of this paper and based on the quasi-dimensional analysis method and the consistent similarity rate,the influence of the selfweight and live load of non-structural members should be considered in the artificial mass design of the scaled model.The calculation selects the under-artificial quality model.(4)The TMD parameters derived based on the rigid foundation were applied to the assembled wall-type shock absorption TMD,and shaking table experiments were carried out on the rigid foundation and soft soil foundation respectively,and the shock absorption effect of the assembled wall-type shock absorption TMD was compared.The results show that,the TMD design parameters based on the assumption of rigid foundation can be applied to controlled structures with rigid foundations,which can significantly reduce the dynamic response of the structure under rigid foundations.In the case of soft foundations,the traditional TMD design parameters do not take into account the SSI effect.Due to the detuning phenomenon,the dynamic response of the wall-type damping TMD to the controlled structure is not significantly reduced,and even has a dynamic amplification effect under certain seismic excitations.(5)In order to obtain the appropriate parameters of TMD under the SSI effect more accurately and quickly,this paper makes a series of improvements to the genetic algorithm commonly used for optimization,such as increasing the number of populations,increasing the genetic operator,randomly generating variation factors,and randomly generating crossover probability.Factors and other measures,the improved algorithm is verified through a case,and its convergence speed and accuracy are compared.The results show that the improved multipopulation genetic algorithm has higher convergence speed and calculation accuracy,and can be applied to large and complex numerical operations.It solves the problems of slow operation speed and low operation accuracy(local optimal solution)of traditional genetic algorithm for optimization of complex problems.(6)Based on the theory of geotechnical earthquake engineering and engineering vibration,the theoretical analysis model considering SSI effect is discussed,and the influence of considering SSI effect on the dynamic characteristics of the structure,the seismic response of the structure and the TMD parameters is analyzed.Through the above analysis,the motion equation of the building system considering the soil-structure TMD interaction is established,and a numerical model is established.By improving the multi-population genetic algorithm,the TMD parameters considering the SSI effect are calculated and optimized using Matlab programming.In the process,the minimization of the peak value of the transfer function is considered as the objective function of the algorithm,and the TMD parameters obtained by optimization are placed in the structural model,and the shaking table test is performed again to verify its shock absorption performance.The results show that considering the SSI effect,And by improving the multi-swarm genetic algorithm to optimize the parameters of the wall-type shock absorption TMD,the dynamic response of the controlled structure under the soft soil foundation can be significantly reduced,and the algorithm can be used to solve complex projects.The paper has 63 pictures,23 tables,and 126 references. |
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