一、概述 我国的工业与民用建筑抗震设计规范在1964年《地震区建筑设计规范,草案稿》和1974年《工业与民用建筑抗震设计规范,TJ11—74》)(试行)版本中,都曾明确地规定,突出建筑物的屋顶间、女儿墙、烟囱等其水平地震作用按底部剪力法所给出的结果,尚应乘以增大系数,以反映突出物地震时震害较为严重的现象。单层工业厂房的天窗架虽也系突出物,但由于当时的认识水准 I. Overview China’s seismic design code for industrial and civil buildings was published in the 1964 edition of the Code for the Design of Buildings in Earthquake Areas, the Draft for Seismic Design of Industrial and Civil Buildings, 1974, (TJ 11-74) (for trial implementation). It is clearly stipulated that the results given by the bottom shear method for the horizontal roofs, parapets, and chimneys of prominent buildings should be multiplied by an increase coefficient to reflect the serious earthquake damage caused by the protuberances. phenomenon. Although the sunroof of a single-story industrial building is also a protruding item, it was due to the level of awareness at the time.