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（1北京建筑工程學(xué)院“工程結(jié)構(gòu)與新材料”北京高等學(xué)校工程研究中心，北京 100044；2北京建筑工程學(xué)院，北京 100044）

[摘要] 傳統(tǒng)鋼框架支撐體系中支撐的大部分強(qiáng)度和剛度都被豎向荷載消耗掉了，沒有充分發(fā)揮其抵抗水平荷載的作用，本文通過對(duì)支撐和梁連接節(jié)點(diǎn)的改進(jìn)，實(shí)現(xiàn)了支撐和框架在豎向傳力分離，使支撐不承受豎向荷載?；?/span>ANSYS建立了不承受豎向荷載八字形框架支撐體系（簡(jiǎn)稱新體系）的三維有限元模型，分析了其受力機(jī)理。得到了豎向荷載主要由框架承擔(dān)，支撐受力基本為零；水平荷載由框架和支撐共同承擔(dān)的結(jié)論。

[關(guān)鍵詞] 不承受豎向荷載;八字形鋼框架支撐;工作原理;ANSYS有限元分析

中圖分類號(hào)：TU398.7        文獻(xiàn)標(biāo)識(shí)號(hào)碼：A         文章編號(hào)：1002-848X(2013)S1-1437-04

Principle of mechanics of an inverted V-shaped vertical- load- free bracing for steel frames

Zhao Chiyun^1,2, Liu Yan², Yu Guanxiong², Wang Hongsen² , Xing Shuai²

(1 Beijing University of Civil Engineering and Architecture, Beijing Higher Institution Engineering Research Center of Structural Engineering and New Materials, Beijing 100044,China;2 Beijing University of Civil Engineering and Architecture, Beijing 100044, China)

Abstract: Based on the improvement of the connection of the beam and braces, this paper presents an inverted V-shaped vertical- load- free bracing for steel frames, and make an analysis on its mechanical principle by using finite element software ANSYS. It can be safely concluded that the frames system and the bracing system work together to resist lateral loads while the vertical loads are borne mainly by the frames, the braces are vertical-load-free.

Keywords：vertical-load-free; inverted V-shaped bracing; mechanical principle; ANSYS