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门式钢架(以下简称门架)是国内轻工业厂房(包括一些援外设计)中正在推广应用的一种重要结构。这种结构具有施工方便、净空大和经济指标较好等一系列优点。但是,近年来,国内不少设计、施工部门反映,门架在转角处普遍发生较严重的裂缝,其裂缝宽度一般都超过了规范的要求,有的甚至达到0.8～1mm。为了解决这一生产中急需解决的问题,73年我室曾受一机部西安设计院委托,着重结合设计中采用的外斜式门架的转角节
The portal type steel frame (hereinafter referred to as the portal frame) is an important structure that is being promoted and applied in domestic light industrial plants (including some foreign aid designs). This structure has a series of advantages such as convenient construction, large headroom, and good economic indicators. However, in recent years, many domestic design and construction departments have reported that cracks in the corners of the gantry have generally occurred. The crack width generally exceeds the requirements of the specifications, and some even reach 0.8 to 1 mm. In order to solve the urgent problem that needs to be solved in this production, in the year of 2013, our chamber was entrusted by the Xi’an Design Institute of the Ministry of Machines, focusing on the corner section of the external oblique gantry used in the design.