人防地下室门框墙荷载取值和内力计算方法

发布时间：2018-05-12 18:44

本文选题：门框墙 + 上挡墙　；参考：《结构工程师》2014年06期

【摘要】：净高超过3.6 m的五、六级人防地下室门框墙需要手算内力和配筋。对于最常见的无侧立柱型门框墙,可根据门框墙的组成部分将其分割成侧挡墙、门槛、上挡墙和上挡梁,按照单一构件确定其等效静荷载取值和计算方法。侧挡墙和门槛可按照规范提供的方法设计。现有文献对上挡墙的等效静荷载取值说法不一,可根据人防设计规范的要求,按照是否设置上挡梁,分别取临空墙荷载或门框墙荷载。上挡梁的计算跨度和边界条件,在不同文献中区别较大。在SAP2000中采用壳单元和梁单元分别模拟人防墙板和上挡梁,结果显示上挡梁的支座条件很难达到理想的固结。由于门框墙的几何尺寸较为固定,层高和支撑墙的长度对上挡梁弯矩影响不大。分别调整上挡梁截面、支撑墙墙厚和梁跨度,无量纲化之后,发现墙梁抗弯刚度比同支座与跨中弯矩比之间呈对数关系,并对其进行了拟合。给出了无侧立柱型门框墙的手算流程,并同图集结果进行对比,结果显示本文提供的计算方法同人防图集的配筋值较为接近。
[Abstract]:If the net height is more than 3.6 m, the manual internal force and reinforcement are required for the door frame wall of the civil air defense basement of grade five and six. For the most common door frame wall without side column, it can be divided into side retaining wall, threshold wall, upper retaining wall and upper retaining beam according to the components of the door frame wall, and the equivalent static load value and calculation method can be determined according to a single member. The side wall and the threshold can be designed according to the method provided by the specification. According to the requirement of civil air defense design code, according to whether the upper retaining beam is installed, the load of the wall facing to the empty or the wall of the door frame can be taken separately according to the different values of the equivalent static load of the upper retaining wall in the existing literature. The calculation span and boundary conditions of the upper retaining beam are different from each other in different literatures. In SAP2000, the shell element and the beam element are used to simulate the civil defense wall plate and the upper retaining beam, respectively. The results show that the support condition of the upper retaining beam is difficult to achieve the ideal consolidation. Because the geometric dimension of the door frame wall is relatively fixed, the height of the floor and the length of the supporting wall have little effect on the bending moment of the upper retaining beam. After adjusting the section of upper retaining beam and supporting wall thickness and span of beam respectively and dimensionless, it is found that the ratio of bending stiffness to bending stiffness of wall beam is logarithmic with the ratio of bearing to moment in the middle of span, and the logarithmic relationship between the ratio of bending stiffness of wall beam and the ratio of moment to moment in span is found and fitted. The manual calculation flow of the door frame wall without side column is given and compared with the results of the atlas. The results show that the calculation method provided in this paper is close to the reinforcement value of the civil air defense atlas.
【作者单位】：同济大学建筑设计研究院(集团)有限公司;
【分类号】：TU927;TU93

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