Analysis Of Seismic Response Of Steel Derrick Structure

The derrick is a major upgrade structure in the mine production; it is also the specialstructure. It plays very import role in the whole production process. If it damages, it will leadto the paralysis of the entire system. At present scholars research mainly focuses on theorydesign, but few on its seismic response analysis. This paper studied seismic response of thedual slant bracing of steel derrick structure, and then proposed engineering design proposals.The mainly work contained the following four parts:（1）This paper reviewed the seismic response theoretical development, seismic responsecharacteristics of steel derrick structure, the problems and solutions on its seismic responseanalysis. According to the analysis theoretical and the finite element software, It establishedthe finite element model based on the engineering example.（2）By modal analysis of steel derrick structure, this paper concluded that the low-ordermodes took the leading role on seismic response, while the higher modes had little influence.According to the modal periods and modal participation factors of the first8-order modes, itobtained modal characteristics of the structure.（3）This paper analyzed elastic seismic response of steel derrick structure used responsespectrum analysis method and time-history analysis method by SAP2000finite elementsoftware, and two results were basically consistent. It derived that the maximum displacementappeared in the apex, and height at19.000m,26.650m and34.450m horizontal displacementhad mutations. The inter-story displacement angle in X-axis, Y-axis direction of structure hadmutations at the height19.000m and34.450m, the maximum value appeared at height26.650m. Displacement mutation or inter-story displacement angle larger indicated that thelateral stiffness smaller at the corresponding part of structure and easily became weak parts,therefore strengthening measures should be adopted in seismic design.（4）This paper used the Pushover method for equivalent static analysis of the steelderrick structure, and it obtained formation and distribution of structural plastic hinge, weakest parts of the structure and the failure modes. The sequence of plastic hinges appearedwere: two ends of supporting beam, two ends of platform beam, the bending department andvariable cross section site of the main bracing column, the bending department of deputybracing column, and plastic hinge of two ends of supporting beam firstly reached limit status.According to the results of the analysis, this paper presents the proposed rationalizationof seismic design of steel derrick structure. Come to the conclusion by studying the work,which has important theoretical and practical engineering applications, and laid a foundationfor further study of the steel derrick structure.