高振型对主厂房框架柱地震作用的影响

摘要

采用振型分解反应谱法,计算8°区水平双向地震作用下少墙型钢混凝土火电厂主厂房框架结构体系框架中柱的地震作用效应,考察结构的振型质量参与系数,确定应该考虑的合理振型数目.为充分考虑高振型的影响,选取不同振型数目组合进行计算比较,计算剪力和弯矩增大系数,然后对不同场地类别对剪力增大系数的影响进行分析.%Adopting modal response spectrum method, calculate the earthquake action effect about high and low bays columns of few few walls SRC frame structure of main powerhouse in thermal power plant considering higher mode under horizontal bi-direction earthquake in 8 degrees district, then investigate the modal participating mass ratios, and determine the necessary reasonable modal number. Considering the effect of higher modal adequately , calculate and compare the earthquake action effect selecting different modal number, and determine shear adjustment coefficient , then analyse the effect for under different site category.