Effect Of BRB Layout Scheme On Seismic Behavior Of Steel Frame-bent Structures Of Thermal Power Plant Main Buildings

In recent years,the total amount of national electricity has continued to grow,and thermal power plants have gradually become the main force of electricity production in China.Due to restrictions on the layout of the process,it cannot be completely arranged in a way that is conducive to seismic design.Furthermore,the coal hopper with large concentrated load in the main building also caused seriously uneven distribution of mass and stiffness.Therefore,it is necessary to carry out a refined design of the support arrangement of the main plant of the thermal power plant.Firstly,this paper summarizes the calculation methods of BRB related parameters to study the effect of BRB layout scheme on seismic behavior of steel frame-bent structures of thermal power plant main buildings.According to serious uneven mass distribution and the characteristics of space requirements,two layout methods are proposed which are the interval BRB of the coal hopper side span and the interval BRB of the coal hopper middle span.Secondly,taking the Philippine thermal power plant as an example,the simplified simulation is carried out by the softmare Midas Gen.Pushover analysis and dynamic elastoplastic time history analysis is conducted in no-braced,general braced full span,the interval BRB of the coal hopper side span and the interval BRB of the coal hopper middle span frame structures.Through the reasearch for the plastic hinge developed trends and path,seismic performance in different BRB layout scheme,this paper provides some advice for the application of BRB in the steel frame-bent structures of thermal power plant main buildings.At the end,In view of the problem that the lateral shift of the coal hopper layer is too large,this paper combines the characteristics of the thermal power plant and the design method of the multi-story steel structure to conduct theoretical analysis.and proposes eight optimization schemes and discusses the feasibility of their practical application.Specifically,the two-span and four-span BRBs are arranged in X-type,herringbone-type and combination-type.By comparing the parameters such as the axial compression ratio,This paper proposes some preliminary optimization proposal which has certain reference value for the subsequent practical engineering application.