钢井架结构地震反应分析-结构工程专业论文.docxVIP

Subject : Analysis of Seismic Response of Steel Derrick Structure Specialty : Structure Engineering Name : Lv Zhen (Signature) Instructor : Su Sanqing (Signature) ABSTRACT The derrick is a major upgrade structure in the mine production; it is also the special structure. It plays very import role in the whole production process. If it damages, it will lead to the paralysis of the entire system. At present scholars research mainly focuses on theory design, but few on its seismic response analysis. This paper studied seismic response of the dual 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 response characteristics of steel derrick structure, the problems and solutions on its seismic response analysis. According to the analysis theoretical and the finite element software, It established the finite element model based on the engineering example. （2）By modal analysis of steel derrick structure, this paper concluded that the low-order modes 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 first 8-order modes, it obtained modal characteristics of the structure. （3）This paper analyzed elastic seismic response of steel derrick structure used response spectrum analysis method and time-history analysis method by SAP2000 finite element software, and two results were basically consistent. It derived that the maximum displacement appeared in the apex, and height at 19.000m, 26.650m and 34.450m horizontal displacement had mutations. The inter-story displacement angle in X-axis, Y-axis direction of structure had mutations at the height 19.000m and 34.450m, the maximum value appeared at height 26.650m. Displacement mutation or inter-story displacement angle larger indicated that the lateral stiffn