- 摘 要
-
申宇杰， 房正剛
（西安建筑科技大學(xué)土木工程學(xué)院，西安710055）[摘要] 目前，我國《鋼結(jié)構(gòu)設(shè)計規(guī)范》( GB50017-2003)對于采用平板柱腳的軸心受壓柱，柱腳均當(dāng)作理想鉸接對待，而實際上卻具有相當(dāng)可觀的轉(zhuǎn)動約束作用?？紤]平板柱腳的約束作用后，可使柱子的計算長度減小。關(guān)于平板柱腳柱計算長度系數(shù)的計算，通常是由平板柱腳轉(zhuǎn)動剛度進而推出柱計算長度系數(shù)的近似公式。通過有限元建立軸心受壓柱平板柱腳模型，避開轉(zhuǎn)動剛度直接求得柱計算長度系數(shù)，并分析底板厚度、錨栓直徑及截面尺寸等因素對軸壓柱平板柱腳轉(zhuǎn)動約束的影響。
[關(guān)鍵詞] 平板柱腳；計算長度；軸心受壓柱；有限元模型
中圖分類號：TU392.5 文獻標(biāo)識碼：A 文章編號：1002-848X(2011) S2-0262-04Finite element analysis of axially loaded column plated column base
Shen Yujie, Fang Zhenggang
( College of Civil Engineering, Xi' an University of Architecture&Technology, Xi' an 710055, China)Abstract: At present, according to Code for design of steel structures( GB50017-2003), for axially loaded column with plated column base, the column bases are considered as hinged supports, but possess actually remarkable rotational restraint. The effective length of columns can be decreased when the rotational stiffness of plated column base is considered in calculation. The effective length factor of columns is usually calculated according the approximate formula which is deduced by the rotational stiffness. Axially loaded column plated column base models were established with the finite element software, the effective length factor of columns was obtained by the method which can avoid calculating rotational stiffness of plated column bases, the influence factors on the rotational restraint of axially loaded column plated column base, such as the base plate tluckness, the diameter of anchors, the column section size were also analyzed.
Keywords: plated column base; effective length; axially loaded column; finite element model
