Elastoplastic Seismic Response Analysis Of A New Type Of Molten Salt Collector Tower

Solar thermal power generation technology is a new energy utilization method emerging in recent years,and the solar power tower is the most important structure taking use of the solar thermal power generation technology.There is a huge concentration mass at the top of the solar power tower,and a large opening is set at the bottom,moreover,the research on the seismic performance of the solar power tower at home and abroad is relatively few.Therefore,based on the prototype structure of a solar power tower provided by Jiangsu Power Design Institute,modal analysis,incremental dynamic analysis,vulnerability analysis and other related analysis of the structure are expanded in this paper.Furthermore,the relevant laws and seismic performance of the solar power tower under multi-directional earthquakes are obtained,which provides the further reference for the seismic design of similar structures.And the specific research content is as follows:Firstly,Dr.Wilson's scale test is numerically simulated in ABAQUS,and the constitutive relationship of concrete and steel in ABAQUS is introduced in detail.By comparing the results of test with that of finite element analysis,great agreement was found,which denotes that ABAQUS can ideally simulate the mechanical properties of reinforced concrete,and it is proved that the elasto-plastic analysis of solar power towers based on ABAQUS is feasible.Secondly,based on the existing data,a three-dimensional finite element model of the solar power tower is established in ABAQUS,and the dynamic characteristics of the solar power tower are analyzed through modal analysis.By selecting appropriate ground motion records from the Pacific Earthquake Research Center,incremental dynamic analysis and vulnerability analysis on the solar power tower are carried out on herein.and the incremental dynamic curve and vulnerability curve of the solar power tower under multi-directional earthquakes are obtained,and the overriding probability at each limit state is calculated,and the final result proves that the solar power tower meets the seismic fortification requirements in the Code for Seismic Design of Buildings(GB50011-2010).Combined with the method in the ATC-63 report,the collapse resistance analysis of the solar power tower is carried out,and the finally conclusion depicts that the structural collapse margin ratio is greater than 2.3,which meets the requirements.The solar power tower is divided into several areas and each area is subjected to incremental dynamic analysis and vulnerability analysis.Considering the position of each partition,the fragile surface of the solar power tower is obtained.Therefore,the damage probability at each height is analyzed,and the most dangerous position of the solar power tower is between 0m and 20 m at the bottom,and the damage probability is relatively large in the between 130 m and 150 m.Finally,referring to the existing codes and standards,the seismic design and analysis process of the solar power tower are discussed.It is found that the chimney module in the structural design software PKPM has certain reference value for the calculation of the dynamic characteristics and seismic action of the solar power tower.However,there is a large error in the calculation of the additional bending moment.So it is recommended that the calculation of the additional bending moment under earthquakes refer to the Code for Design of High-rising Structures(GB50135-2006).The influence of the incident angle of the seismic wave on the seismic response of the solar power tower is also analyzed,and it is found that the influence of the incident angle of the seismic wave on the bottom bending moment of the solar power tower and the displacement of the collector center is more significant.