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抗震等级是设计部门依据国家有关规定,按“建筑物重要性分类与设防标准”,根据设防类别、结构类型、烈度和房屋高度四个因素确定,而采用不同抗震等级进行的具体设计。以钢筋混凝土框架结构为例,抗震等级划分为一级至四级,以表示其很严重、严重、较严重及一般的四个级别。在中国建筑业中,已经开始严格执行这个等级标准。钢筋混凝土结构构件的抗震设计,应根据结构类型、房屋高度、设防烈度采用不同的抗震等级,并应符合相应的计算和构造要求。注:①设防烈度为6度的建筑(建造于Ⅳ类场地上较高的高层建筑除外)可不进行截面抗震验算,但应符合本章有关的抗震构造要求;②框架剪力墙结构中,当剪力墙部分承受的地震倾覆力矩抗震等级不大于结构总地震倾覆力矩的50%时,其框架部分应按框架结构的抗震等级采用;③有框支层的剪力墙结构,除落地剪力墙底部加强区外,均可按一般剪力墙结构的抗震等级取用;④房屋高度指室外地面至檐口的高度;⑤设防烈度为8度的丙类建造且房屋高度不超过12m的规则的一般民用框架结构(体育馆和影剧院除外)和类似的工业框架结构,抗震等级可采用三级;⑥对设防烈度为6度、7度的地区,当采用有框支层的剪力墙结构时,其房屋高度分别不宜超过120m、100m。⑦本表所列结构,除铰接排架外,均为现浇钢筋混凝土结构;剪力墙即为现行国家标准《建筑抗震设计规范》中的现浇剪力墙。希望可以帮到你。
混凝土结构的抗震等级
一、二、
三、四级的划分,是根据①房屋所在地区的设防烈度;②结构型式;③房屋的高度。见GB50011-2020《建筑抗震设计规范》表6.1.2及附注。另外,还要遵照房屋的设防类别相关规定。
1抗震等级建筑物的抗震设防类别有关,建筑抗震设防类别的划分,应符合国家标准《建筑抗震设防分类标准》gb50223的规定。2抗震等级建筑物的场地类别有关,按建筑抗震设防类别及场地类别确定用于确定抗震等级的烈度.3建筑抗震设计规范gb50011-20016.1.2钢筋混凝土房屋应根据烈度、结构类型和房屋高度采用不同的抗震等级,并应符合相应的计算和构造措施要求。丙类建筑的抗震等级应按表6.1.2确定。注:1建筑场地为Ⅰ类时,除6度外可按表内降低一度所对应的抗震等级采取抗震构造措施,但相应的计算要求不应降低;2接近或等于高度分界时,应允许结合房屋不规则程度及场地、地基条件确定抗震等级;3部分框支抗震墙结构中,抗震墙加强部位以上的一般部位,应允许按抗震墙结构确定其抗震等级。6.1.3钢筋混凝土房屋抗震等级的确定,尚应符合下列要求:1框架抗震墙结构,在基本振型地震作用下,若框架部分承受的地震倾覆力矩大于结构总地震倾覆力矩的50%,其框架部分的抗震等级应按框架结构确定,最大适用高度可比框架结构适当增加。2裙房与主楼相连,除应按裙房本身确定外,不应低于主楼的抗震等级;主楼结构在裙房顶层及相邻上下各一层应适当加强抗震构造措施。裙房与主楼分离时,应按裙房本身确定抗震等级。3当地,下室顶板作为上部结构的嵌固部位时,地下一层的抗震等级应与上部结构相同地下一层以下的抗震等级可根据具体情况采用三级或更低等级。地下室中无上部结构的部分,可根据具体情况采用三级或更低等级。4抗震设防类别为甲、乙、丁类的建筑,应按本规范第3.1.3条规定和表6.1.2确定抗震等级;其中8度乙类建筑高度超过表6.1.2规定的范围时,应经专门研究采取比一级更有效的抗震措施。4砌体结构、排架无抗震等级;5应注意规范中对抗震等级的调整(特别是高规)
你好,划分为12个等级
抗震设防烈度是按国家规定的权限批准作为一个地区抗震设防依据的地震烈度。以北京地区为例,抗震设防烈度为8度,即超越8度的概率为10%左右。
现行抗震设计规范适用于抗震设防烈度为6、7、8、9度地区建筑工程的抗震设计、隔震、消能减震设计。
框架结构的抗震等级是根据规范要求确定的。确定一个框架结构的抗震等级需要参考两本结构规范:
1、《建筑工程抗震设防分类标准》(GB50223-2008);
2、《建筑抗震设计规范》(GB50011-2020)。先根据《建筑工程抗震设防分类标准》确定建筑物抗震设防分类,再根据《建筑抗震设计规范》(49页)确定建筑物的抗震等级。