钢管混凝土多肢中柱双层肩梁承载力分析和计算  

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

作　　者：门进杰[1] 王鸿霄 兰涛[1,2] 李然 廖钒志 MEN Jinjie;WANG Hongxiao;LAN Tao;LI Ran;LIAO Fanzhi(State Key Laboratory of Green Building in Western China,Xi’an University of Architecture and Technology,Xi’an 710055,China;CSIC International Engineering Co.,Ltd.,Beijing 100021,China;Ande College,Xi’an University of Architecture&Technology,Xi’an 710055,China)

机构地区：[1]西部绿色建筑国家重点实验室,西安建筑科技大学,西安710055 [2]中国船舶重工集团国际工程有限公司,北京100021 [3]西安建筑科技大学安德学院,西安710055

出　　处：《工业建筑》2021年第9期47-55,74,共10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：为了建立钢管混凝土双肢及四肢中柱双层肩梁的水平承载力计算式,在前期试验和有限元模拟结果基础上,对两种双层肩梁分别设计了43和44个模型,从模型的特征承载力及位移方面分析上、下层肩梁截面高度比(简称"高度比")、中柱与下层肩梁截面高度比(简称"柱梁高度比")、双肢中柱下层肩梁长跨的跨高比及四肢中柱下层肩梁短跨及长跨的跨高比(简称"跨高比")对两种双层肩梁水平承载力的影响,并给出了参数的取值范围。结果表明:两种双层肩梁在各参数变化下的水平承载力变化规律相似;随着柱梁高度比的增加,模型刚度变大,屈服位移降低,承载力呈抛物线上升;随着跨高比的增加,模型承载力呈线性上升,但延性变差;四肢中柱双层肩梁模型随着短跨跨高比增加,翼缘面积增大,承载力小幅上升。基于参数分析结果,确定了荷载在各截面的分配比例,提出模型水平承载力计算式,并基于延性破坏,对计算式进行了修正。In order to construct the calculation formula for the horizontal bearing capacity of double-layer shoulder beams with double-limb or quadruple-limb middle columns of concrete-filled steel tubes(CFST).Based on the results of previous tests and finite element simulations,43 and 44 models of two kinds of double-layer shoulder beams were designed respectively.From the aspects of characteristic bearing capacity and displacement of the models,the section height ratio(the height ratio) of the upper layer to lower layer shoulder beams,the section height ratio of middle columns to lower layer shoulder beams(the column-beam height ratio),and the ratio of the long span or short span to the height of the lower shoulder beam(the span-height ratio) were analyzed,and the range of the parameters was given.The results showed that the horizontal bearing capacity of the two kinds of double-layer shoulder beams was similar in the change of parameters;with the increase of the height ratio of columns to beams,the model stiffness increased,the yield displacement decreased,and the bearing capacity increased in a parabola;with the increase of the span-height ratio,the bearing capacity of the model increased linearly,but the ductility became worse;with the increase of the ratio of the short span to the height,the flange area of the model for the double-layer shoulder beam with four-limb middle column increased,and the bearing capacity would increased slightly.Based on the results of parameter analysis,the load-shared proportion in each section was determined,and the formula for calculating the horizontal bearing capacity of the model was proposed,and the formula was modified based on the ductile failure.

关 键 词：钢管混凝土多肢中柱双层肩梁 有限元分析 上、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 下层肩梁短跨跨高比 水平承载力 计算式 

分 类 号：TU398.9[建筑科学—结构工程]