Abstract: 4-limb?latticed?section?is?a?common?section?type?of?large-span?concrete?filled?steel?tubular?arch?bridges.?There?are?two?types?in?terms?of?the?specific?structure,?including?the?battened?plate?structure?and?laced-bar?structure.?The?calculation?pattern?of?battened?plate?section?is?focused.?The?plate?element?and?spatial?beam?element?are?put?forward,?and?the?formula?of?equivalent?thickness?for?plate?element?is?deduced.?Key?points?of?modeling?with?spatial?beam?element?are?also?introduced.?A?case?study?is?carried?out?to?verify?that?both?calculation?patterns?can?satisfy?the?requirements?of?engineering?precision,?and?the?plate?element?method?is?more?convenient?in?practice.

Key words: 4-1imb latticed section , concrete filled steel tubular（CFST） , calculation pattern , plate element , spatial beam element

摘要： 四肢格构型截面是大跨度钢管混凝土拱桥常用的截面型式,在具体构造上有缀板式和缀条式2种。着重研 究了缀板式格构型截面的计算模式,提出板单元法和空间梁单元法2种计算模式,推导了板单元等效厚度计算公 式,并介绍了空间梁单元法的建模要点。最后通过一个工程实例分析,表明2种计算模式都能满足工程计算精度 要求,在具体应用上板单元法更为方便。

关键词: 四肢格构型截面, 钢管混凝土, 计算模式, 板单元法, 空间梁单元法