CN113818563A - 一种腹板弯折剪切连梁及其施工方法 - Google Patents
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Abstract
本发明提出了一种新形腹板弯折剪切连梁偏心支撑组合框架结构形式,属于结构工程技术领域。该结构形式主要由组合框架,腹板弯折剪切连梁,连接横梁以及斜撑组成,所述腹板弯折剪切连梁由腹板,约束翼缘板,端板组成,所述部分腹板向面内弯折,所述端板在所述腹板两端与所述腹板焊接,所述顶部端板通过高强螺栓和所述钢梁腹板相连,所述底部端板与所述连接横梁通过高强螺栓连接,所述连接横梁下端与所述斜撑焊接,所述斜撑另一端与所述组合框架框架柱焊接。该结构在施工时,首先进行组合框架结构的施工,待所述组合框架结构施工完成后进行斜撑和连接横梁的焊接施工,最后再进行腹板弯折剪切连梁的安装施工,竖向结构体系和抗侧体系互相不影响。
Description
技术领域
本发明涉及结构工程技术领域,特别涉及一种腹板弯折剪切连梁偏心支撑框架的结构形式。
背景技术
相较于传统的钢框架结构和混凝土框架结构,组合框架结构充分发挥了混凝土受压和钢材受拉的材料特性,实现了“1+1>2”的效果。如图2为传统的剪切连梁偏心支撑组合框架结构,由组合框架、剪切连梁、连接横梁、斜撑组成,剪切连梁偏心支撑组合框架最大的特点在于,在地震作用时,可以将损伤集中于剪切连梁自身,保护周边主体结构不受地震作用的破坏。图3为剪切连梁偏心支撑框架在水平荷载作用下的内力图,对于传统的剪切连梁偏心支撑组合框架结构,由于连梁上部与钢梁的下翼缘连接,造成了连梁剪切中心和组合梁中性轴的偏心距e较大,当连梁剪切变形耗能时会使得组合梁跨中受到一个较大的集中弯矩作用,从而导致跨中混凝土楼板出现比较严重的开裂损伤,不利于震后的修复工作。
发明内容
本发明旨在至少在一定程度上解决相关技术中的技术问题之一。
为此本发明的目的在于提出一种新型腹板弯折剪切连梁偏心支撑框架形式,解决传统剪切连梁偏心支撑框架中跨中混凝土楼板在地震作用中开裂严重不利于震后修复的问题,同时剪切连梁均采用螺栓连接,进一步提升震后的可修复性,节约修复成本。
为达到上述目的,本发明提出了一种新型腹板弯折剪切连梁偏心支撑组合框架结构形式,包括:钢-混凝土组合框架、腹板弯折剪切连梁、连接横梁和斜撑。当地震小于预设震级时,腹板弯折剪切连梁处于弹性状态,可以为组合框架提供额外的刚度来抵抗地震作用,减小结构体系的变形,当地震作用大于预设震级时,腹板弯折剪切连梁先于主体结构进入塑性阶段耗能,吸收地震输入的能量,保护周边主体结构免受地震的破坏。同时,由于剪切连梁的腹板弯折,使得剪切连梁可以与组合梁的钢梁腹板相连,降低了连梁剪力中心和组合梁中性轴之间的偏心距e,地震作用中,由于连梁剪切变形而对组合梁产生的附加弯矩大大降低,有效的阻止了组合梁跨中混凝土板开裂的风险,于此同时,由于腹板弯折剪切连梁通过螺栓与钢梁和连接横梁相连,降低了震后的修复成本。
进一步地,所述组合框架由组合梁和钢柱组成,所述组合梁由混凝土板和钢梁组成。
进一步地,所述钢梁由上翼缘板,腹板,下翼缘板组成。
进一步地,所述斜撑和所述连接横梁应按照相关规范进行设计和验算,保证足够的刚度和承载力,在所述腹板弯折剪切连梁失效前处于弹性状态。
进一步地,所述斜撑下端与所述组合框架柱底焊接,所述斜撑另一端和所述连接横梁下端焊接,且焊接节点应满足相关规范刚性节点的设计需求。
进一步地,应在所述焊接节点处配置加劲肋以防止应力集中。
进一步地,所述腹板弯折剪切连梁由腹板,端板,约束翼缘板组成。
进一步地,所述腹板的部分腹板向面内弯折,所述腹板两端与所述端板焊接。
进一步地,所述端板应按照设计要求留有高强螺栓孔。
进一步地,所述弯折剪切连梁一端通过所述顶部端板与所述钢梁腹板通过高强螺栓连接,所述腹板弯折剪切连梁另一端通过所述底部端板与所述连接横梁通过高强螺栓连接。
进一步地,所述腹板弯折剪切连梁应配置约束翼缘板,有效防止所述腹板面外屈曲,所述约束翼缘板与所述腹板侧边通过焊接连接。
进一步地,所述螺栓连接节点应经过相关规范验算,从而在所述腹板弯折剪切连梁失效前不产生滑移。
可选地,所述腹板弯折剪切连梁的数目可以根据实际需求来确定,开间内可以配置一个或者多个所述腹板弯折剪切连梁。
附图说明
图1为新型腹板弯折剪切连梁偏心支撑组合框架结构示意图。
图2为传统的剪切连梁偏心支撑组合框架示意图。
图3为剪切连梁偏心支撑框架内力图。
图4为腹板弯折剪切连梁构件详图。
附图标记说明:FS表示剪切连梁剪力中心处剪力值,e表示剪切连梁剪力中心和组合梁中性轴之间的偏心距。
具体实施方式
以下结合附图,对本发明的新型腹板弯折剪切连梁偏心支撑组合框架作进一步描述如下。
如图2所示,新型腹板弯折剪切连梁偏心支撑组合框架由框架柱、组合梁、腹板弯折剪切连梁、连接横梁和斜撑组成。
首先根据抗震需求以及使用需求确定腹板弯折剪切连梁的数目和尺寸,应使腹板弯折剪切连梁在小震时处于弹性状态,为结构提供额外的刚度,当中震和大震时,连梁进入塑性阶段进行耗能,从而保护主体结构不受地震破坏。
进行组合框架结构的施工,其中框架柱和组合梁的钢梁在工厂进行加工,,钢梁应根据腹板弯折剪切连梁的布置位置和节点构造事先预留好螺栓孔,组合梁的混凝土板可以采用现浇板或者叠合板。
进行连接横梁和斜撑的安装,连接横梁和斜撑均在工厂预制,在现场进行焊接,且焊接部位应配置加劲肋,防止应力集中。此外,为给腹板弯折剪切连梁提供足够的边界约束,在设计时,需要使得连梁和斜撑在连梁达到极限承载力时仍保持弹性且不发生失稳。
待框架结构基本施工完成后,进行腹板弯折剪切连梁的安装,腹板弯折剪切连梁的顶部端板和钢梁腹板通过高强螺栓连接,腹板弯折剪切连梁的另一端端板和连接横梁通过高强螺栓连接。
进一步地,焊接连接部位应按照刚性节点进行设计验算,以保证给腹板弯折剪切连梁提供足够的支撑;螺栓连接节点在设计时应保证,当腹板弯折剪切连梁达到极限承载力时,仍不发生滑移,从而保证剪切连梁构件的耗能效率。本发明提出了一种新型腹板弯折剪切连梁偏心支撑组合框架结构形式,在小震时可以给结构提供额外的刚度,减小结构的变形,在中震、大震时,腹板弯折剪切连梁提前屈服耗能,耗散地震能量,保证主体结构不受地震的破坏,相比于传统剪切连梁偏心支撑组合框架,由于剪切连梁部分腹板弯折,可以与钢梁腹板进行连接,减小了连梁剪切中心和框架组合梁的中心轴之间的偏心距,在剪切变形耗能时,降低了施加给组合梁的集中弯矩,有效阻止了上部混凝土楼板开裂的风险,同时,由于腹板弯折剪切连梁与周边构件采用高强螺栓这种装配化的连接形式,加快了震后修复的速度。
Claims (8)
1.本发明提出了一种腹板弯折剪切连梁偏心支撑组合框架结构形式,其特征在于,该结构由组合框架,腹板弯折剪切连梁,连接横梁,斜撑组成。
2.根据权利要求1所述的组合框架,其特征在于,所述组合框架由钢柱和组合梁组成,其中,所述组合梁由混凝土板和钢梁组成。
3.根据权利要求2所述的组合梁,其特征在于,所述钢梁包括上翼缘板、腹板、底板所述混凝土板包括钢筋和混凝土。
4.根据权利要求1所述的腹板弯折剪切连梁,其特征在于,所述腹板弯折剪切连梁由腹板,加劲肋,端板组成。
5.根据权利要求4所述腹板,其特征在于,所述腹板的部分腹板向面内弯折90度,所述腹板的两端与所述端板焊接。
6.根据权利要求4所述腹板弯折剪切连梁,其特征在于,所述腹板弯折剪切连梁顶端通过所述顶部端板与所述钢梁腹板通过螺栓连接,底端通过所述底部端板与所述连接横梁通过高强螺栓连接。
7.根据权利要求1所述的连接横梁,其特征在于,所述连接横梁应具有足够刚度和承载力,防止所述连接横梁在所述腹板弯折剪切连梁失效前屈服。
8.根据权利要求1所述的斜撑,其特征在于,所述斜撑一端与所述连接横梁焊接,另一端与所述组合框架的钢柱柱底焊接,同时所述斜撑应满足相关规范设计要求,在所述腹板弯折剪切连梁失效前处于弹性状态,为所述连梁提供较强的边界约束。
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