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（1 廣州市設(shè)計(jì)院，510620；2 西安建筑科技大學(xué)土木工程學(xué)院，710055）

［提要］在建立60，80，100，125，150m跨度張弦桁架模型的基礎(chǔ)上，進(jìn)行了自振特性分析。采用振型分解反應(yīng)譜法和時(shí)程分析方法對(duì)豎向地震作用進(jìn)行了分析，得到了小震、大震作用下動(dòng)內(nèi)力分布規(guī)律。計(jì)算分析了高跨比、預(yù)應(yīng)力、斜放等因素的影響。對(duì)結(jié)果的統(tǒng)計(jì)分析表明，各模型具有相同的動(dòng)內(nèi)力分布特點(diǎn)，總結(jié)了張弦桁架動(dòng)內(nèi)力計(jì)算簡圖及參數(shù)，結(jié)果可供張弦桁架設(shè)計(jì)參考。

［關(guān)鍵詞］張弦桁架；豎向地震反應(yīng)；動(dòng)內(nèi)力

Dynamic Characteristic Study of Large-span Truss String Structure Under Vertical Seismic Action/Xiong Wei¹,Han Jianqiang¹,Wu Minzhe²(1 Guangzhou Design Institute,Guangzhou 510620,China; 2 College of Civil Engineering, Xi′an Univ. of Arch. & Tech., Xi′an 710055,China)

Abstract:Truss string structure models of 60m, 80m, 100m, 125m, 150m span are developed, and  their vibration characteristic by frequency domain analysis is got. The distribution of dynamic internal force is analyzed by time history method and response spectrum method, as well as, height span ratio, prestress, sloping support are also discussed. Analysis indicates that all truss string structure models have the same distribution law of dynamic internal force by statistics method.The figure about dynamic internal force distribution and factor are presented.

Keywords:truss string structure； vertical seismic response； dynamic internal force