Dynamic Analysis On The “Three Spans Four Pillars” Framework Wharf With Steel Casing Reinforced Concrete Pile

Supported by the second stage of Guoyuan Port in Chongqing, Combined with the results of the relevant research projects.This article carries out the research of how does Isolation bearing influence on the Structural dynamic characteristics、structural damage mechanism. The main research contents and conclusions are as follows:(1)Through the research on the Function, development process、using conditions, performance parameters of Isolation bearing, finally, Select the lead core rubber isolation bearing as the vibration isolation system of Shock Absorber Structure in this paper. Act the Guoyuan wharf structure in Chongqing as Absorber Structure, which is researched by this paper. Then, add the Isolation bearing at the bottom of the beam(Between the pillar and beam) and On the top of the steel pipe concrete pile(Between the steel pipe concrete pile foundation and pillar) of the nol-Shock Absorber Structure respectively, Which forms the research object in this paper — — the nol-Shock Absorber Structure 、 the Shock Absorber Structure Ⅰ and the Shock Absorber StructureⅡ;(2)Combined with the actual project,Using finite element software SAP2000 to constructing the model of the Shock Absorber Structure and nol-Shock Absorber Structure, Through the modal analysis, get the natural vibration period and frequency of the structure, and research on how does Isolation bearing influence on Structural seismic characteristics and dynamic characteristics. Calculations and Analyses show:Set the lead core rubber isolation bearing in the wharf structure, it can effectively extend the natural vibration period and improve the seismic performance of wharf structure;(3)By Choosing the EICENTRO and the TIANJIN wave, this article carries out the Dynamic time history analysis of the nol-Shock Absorber Structure and the Shock Absorber Structure respectively. Calculate the basal internal force 、 the node displacement、the bar internal force、the Longitudinal beam internal force、the Longitudinal contact support internal force、the front Longitudinal contact support internal force Time-history result of the nol-Shock Absorber Structure and the Shock Absorber Structure under the two kinds of Seismic wave, And collection and analysis the corresponding time history analysis data, To study the effect of Isolation bearing to the dynamic characteristics and the mechanical characteristics of the wharf structrue. Calculations and Analyses show:Set the lead core rubber isolation bearing in the wharf structure,it can effectively optimize the mechanical properties of the bar under the action of the earthquake and improve the seismic performance of wharf structure;(4)By using SAP2000 software, this article carries out the pushover analysis of the nol-Shock Absorber Structure and the Shock Absorber Structure under 6 horizontal action. What’s more, by observing occurrence and development process of plastic hinge of the nol-Shock Absorber Structure and the Shock Absorber Structure, it obtains force transmission、evolution mechanism and damage mechanism of the corresponding structure type, To study the effect of Isolation bearing to the damage mechanism of wharf. The calculation results show:Set the lead core rubber isolation bearing in the wharf structure, it can satisfy the requirements of the ship impact load of the Inland river wharf structure, Delay the emergence and development of plastic hinge at the bottom of the pile foundation section, Optimize the mechanical properties and improve the seismic performance of wharf structure;...