钢管混凝土三肢中柱双层肩梁承载力分析及计算  

BEARING CAPACITY ANALYSIS AND CALCULATIONS OF DOUBLE-LAYER SHOULDER BEAMS WITH TRIPLE-LIMB MIDDLE COLUMNS OF CONCRETE-FILLED STEEL TUBUS

作　　者：兰涛[1,2,4] 张博雅 李泽旭 门进杰 傅彦青[3] 廖钒志[1] LAN Tao;ZHANG Boya;LI Zexu;MEN Jinjie;FU Yanqing;LIAO Fanzhi(School of Civil Engineering,Xian University of Architecture&Technology,Xi’an 710055,China;CSIC International Engineering Co.,Ltd.,Beijing 100021,China;Central Research Institute of Building&Construction Co.,Ltd.,MCC Group,Beijing 100088,China;School of Civil Engineering,Southwest Jiaotong University,Chengdu 610031,China)

机构地区：[1]西安建筑科技大学土木工程学院,西安710055 [2]中国船舶重工集团国际工程有限公司,北京100021 [3]中冶建筑研究总院有限公司,北京100088 [4]西南交通大学土木工程学院,成都610031

出　　处：《工业建筑》2021年第9期33-40,149,共9页Industrial Construction

基　　金：国家重点研发计划项目(2017YFC0703406);中国船舶重工集团科技创新与研发项目(I00121L2019)。

摘　　要：由于三肢中柱双层肩梁特殊的结构形式使得内力分配相比于双肢及四肢中柱双层肩梁有所不同。为了建立三肢中柱双层肩梁的水平承载力计算式,在试验及有限元研究的基础上,设计了42个模型,对影响三肢中柱双层肩梁水平承载力的关键参数进行有限元分析,探讨上层与下层肩梁截面高度比(高度比)、中柱与下层肩梁截面高度比(柱梁高度比),下层肩梁跨高比(跨高比)对三肢中柱双层肩梁水平承载力的影响规律。分析了模型的特征承载力和位移,并给出参数取值范围。结果表明:高度比对模型承载力影响很小;柱梁高度比越大,模型越接近脆性破坏,特征承载力越大;跨高比越大,模型承载力越大,但受力后期,承载力下降速度也越快。基于分析结果,提出了三种三肢中柱双层肩梁破坏形式和水平承载力计算式;并基于模型的延性破坏,修正了计算式的误差。Due to the special structure of double-layer shoulder beams with triple-limb middle columns,the internal force distribution is different from that of double-layer shoulder beams with double-limb or quadruple-limb middle columns.To construct the calculation formula of horizontal bearing capacity of double-layer shoulder beams with triple-limb middle columns,42 models were designed on the basis of tests and finite element study.The key parameters influencing the horizontal bearing capacity of double-layer shoulder beams with triple-limb middle columns were analyzed by finite element method.The section height ratio of upper layers to lower layers(the height ratio),section height ratio of middle columns to lower layer shoulder beams(the column-beam height ratio) were discussed,the influence of the span-height ratio of the lower shoulder beam(the span-height ratio) on the horizontal bearing capacity of double shoulder beams with three-limb middle columns was studied.The characteristic bearing capacity and displacement of the model were analyzed,and the range of parameters was given.The results showed that the height ratio had little effect on the bearing capacity of the model;the larger the height ratio of the column and beam was,the greater the characteristic bearing capacity was;the larger the span-height ratio was,the greater the bearing capacity of the model was,but the faster the bearing capacity decreased in the later stage.Based on the analysis results,three failure modes and horizontal bearing capacity formulas of the double-layer shoulder beam with triple-limb middle columns were proposed,and the error of the formula was corrected based on the ductile failure of the model.

关 键 词：三肢中柱双层肩梁 有限元分析 上层与下层肩梁截面高度比 中柱与下层肩梁截面高度比 下层肩梁跨高比 水平承载力计算式 

分 类 号：TU398.9[建筑科学—结构工程]