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砖混结构是我国住宅建筑采用较广的一种体系。这种体系在抗震性能上比较差。唐山地震表明无筋多层砖混住宅所受的破坏极其严重,造成人员大量伤亡。我国《建筑结构设计统一标准》(初稿)指出:“建筑结构设计的目标是……在偶然事件发生时及发生后,仍然保持必要的整体稳定性”。值得指出的是:由于地震发生的偶然性,在低烈度区发生高烈度地震的可能性是存在的。近年来,我国发生的强烈地震几乎都发生在历史上没有大地震记载的地区。如唐山的基本烈度原为6度,却发生了10～11度强震。因此,提高住宅建筑的抗震能力是十分必要的。唐山地震调查表明,虽然多层砖混结构的建筑物倒坍率很高,但也有一些裂而未倒。如地区外贸局办公楼(四层),位于10度区;
Brick-concrete structure is a widely used system for residential construction in China. This system is relatively poor in seismic performance. The Tangshan earthquake showed that the destruction of unreinforced multi-story brick-concrete dwellings was extremely serious and caused heavy casualties. China’s “Unified Standard for Architectural Structural Design” (first draft) states that: “The goal of architectural design is to ... maintain the necessary overall stability when accidental events occur and occur.” It is worth pointing out that because of the accidental nature of earthquakes, the possibility of high-intensity earthquakes occurring in low-intensity areas exists. In recent years, the strong earthquakes that have taken place in our country have almost all occurred in areas that have not been recorded by major earthquakes in history. If the basic intensity of Tangshan was 6 degrees, a strong earthquake of 10 to 11 degrees occurred. Therefore, it is necessary to improve the earthquake resistance of residential buildings. The Tangshan earthquake survey showed that although the rate of collapse of buildings with multi-storey brick-concrete structures was high, there were some cracks that did not fall. Such as the Office of Foreign Trade Bureau (4th floor), located in the 10th district;