几年来,预应力V形折板(简称折板)这种新型建筑构件得到了推广应用,最大使用跨度已达24米。 1976年7月28日,唐山丰南一带发生强烈地震,波及天津、北京地区,使折板屋盖经受了地震的检验,现将调查情况简介如下: 一、折板屋盖的抗震情况 (一)烈度9～10度地区情况地震烈度10度左右地区,有1972年 In the past few years, the new type of construction elements such as prestressed V-shaped flaps (referred to as flaps) have been promoted and used, with a maximum span of 24 meters. On July 28, 1976, a strong earthquake took place in Fengnan area of ​​Tangshan, affecting the areas of Tianjin and Beijing. The folding roofs were subjected to seismic inspections. The investigation is now summarized as follows: 1. Seismic situation of folding roofs (1) Intensity In 9 to 10 degree areas, the earthquake intensity was about 10 degrees, and there were 1972 years.