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《钢结构滞回性能及抗震设计》详细介绍了循环荷载作用下钢材的本构关系、钢结构滞回性能的有限元模拟理论和方法,在此基础上通过大量的有限元模拟及试验研究结果,系统地分析了各种形式的钢构件、梁柱连接、偏心支撑钢框架、钢框架-钢筋混凝土剪力墙结构在循环荷载作用下的滞回性能和破坏机理及各种设计参数对结构性能的影响,提出了相应的抗震设计对策。《钢结构滞回性能及抗震设计》适用于结构设计人员及高等院校土木工程专业教师、研究生。
滞回曲线指在反复作用下结构的荷载-变形曲线。它反映结构在反复受力过程中的变形特征、刚度退化及能量消耗,即滞回曲线的性能。滞回曲线的典型形状一般有四种:梭形、弓形、反s形和Z形。1.梭形说明滞回曲线的形状非常饱满
屈曲约束支撑在弹性阶段工作时,就如同普通支撑可为结构提供很大的抗侧刚度,可用于抵抗小震以及风荷载的作用。屈曲约束支撑在弹塑性阶段工作时,变形能力强、滞回性能好,就如同一个性能优良的耗能阻尼器,可用于结构抵御强烈地震作用。(4)保护主体结构屈曲约束支撑具有明确的屈服承载力,在大震下可起到“保险丝”的作用,用于保护主体结构在大震下不屈服或者不严重破坏,并且大震后,经核查,可以方便地更换损坏的支撑。(5)减小相邻构件受力采用屈曲约束支撑,支撑受拉与受压承载力差异很小,可大大减小与支撑相邻构件的内力(包括基础),减小构件截面尺寸,降低结构造价。不足:在安装屈曲约束支撑的部位,也少不了影响使用空间,影响采光和观瞻。施工中,节点连接处理是个关键,也是个难点,处理不好可能导致屈曲约束支撑起不到耗能的作用。传统屈曲约束支撑存在自重过大、构造复杂、某些部位容易出现应力集中的问题。各种不同类型的屈曲约束支撑都有各自的专利权,比如台北县*大楼改造和美国盐湖城Bennett联邦大楼抗震加固工程均使用的是*新日铁公司的产品,均支付了很高的费用.。屈曲约束支撑专利权的存在又在一定程度上制约了它更广泛的使用。2、类型(1)承载型屈曲约束支撑:作为承载构件使用,指通过引入屈曲约束机制来提高支撑构件的设计承载力,保证支撑在屈服前不会发生失稳破坏,从而充分发挥钢材强度,称之为“承载型屈曲约束支撑”;(2)耗能型屈曲约束支撑:作为耗能构件使用,指在弹性阶段利用屈曲约束的原理来提高支撑的设计承载力,在弹塑性阶段利用芯板钢材的拉压屈服滞回来耗能的消能*结构构件,称之为“耗能型屈曲约束支撑”;(3)屈曲约束支撑型阻尼器:作为拉压屈服型软钢阻尼器使用,一般控制在小震屈服,称之为“屈曲约束支撑型阻尼器”
《钢结构滞回性能及抗震设计》详细介绍了循环荷载作用下钢材的本构关系、钢结构滞回性能的有限元模拟理论和方法,在此基础上通过大量的有限元模拟及试验研究结果,系统地分析了各种形式的钢构件、梁柱连接、偏心支撑钢框架、钢框架-钢筋混凝土剪力墙结构在循环荷载作用下的滞回性能和破坏机理及各种设计参数对结构性能的影响,提出了相应的抗震设计对策。《钢结构滞回性能及抗震设计》适用于结构设计人员及高等院校土木工程专业教师、研究生。