空間內(nèi)傾魚(yú)腹式鋼桁梁人行天橋設(shè)計(jì)與創(chuàng)新

摘 要：以某人行天橋?yàn)檠芯繉?duì)象，介紹其橋型的建筑創(chuàng)意與結(jié)構(gòu)設(shè)計(jì)，重點(diǎn)介紹橋梁結(jié)構(gòu)創(chuàng)新點(diǎn)。主橋?yàn)閱慰缦鲁惺胶?jiǎn)支空間魚(yú)腹式變高鋼桁梁結(jié)構(gòu)體系，空間內(nèi)傾的魚(yú)腹式桁架為主要受力體系。上、下弦桿和豎桿間采用X型交叉鋼拉桿代替?zhèn)鹘y(tǒng)的交叉剛性斜腹桿連接方式，首次將X型交叉鋼拉桿應(yīng)用于橋梁結(jié)構(gòu)中?！半pΛ形”橋墩柱腳位置采用剪力釘與PBL剪力鍵相結(jié)合的鋼砼組合結(jié)構(gòu)剛性柱腳連接節(jié)點(diǎn)。橋梁結(jié)構(gòu)受力合理，造型優(yōu)美，體現(xiàn)了造型與結(jié)構(gòu)的有機(jī)結(jié)合。

關(guān)鍵詞：魚(yú)腹式；鋼桁梁；人行天橋；結(jié)構(gòu)創(chuàng)新；節(jié)點(diǎn)設(shè)計(jì)

中圖分類號(hào)：U442.5 文獻(xiàn)標(biāo)志碼：A 文章編號(hào)：2095-2945（2024）29-0068-05

Abstract： Taking a pedestrian bridge as the research object， this paper introduces the architectural creativity and structural design of its bridge type， with a focus on the innovative points of the bridge structure. The main bridge is a single span through type simply supported space fish belly type variable height steel truss structure system， with the fish belly type truss with spatial inclination as the main load-bearing system. The X-shaped cross steel tie rods are used between the upper and lower chord rods and the vertical rods instead of the traditional cross rigid diagonal web rod connection method， and for the first time， the X-shaped cross steel tie rods are applied to bridge structures. The rigid column base connection node of the steel-concrete compositrWie6F5xqixZXqU7oahRqg==e structure， which combines shear nails and PBL shear keys， is used for the position of the "double Λ-shaped" bridge pier column base. The bridge structure has reasonable stress and beautiful shape， reflecting the organic combination of shape and structure.

Keywords： fish belly type; steel truss; footbridge; structural innovation; joint design

隨著城市建設(shè)的發(fā)展，人們?cè)絹?lái)越重視高品質(zhì)的公共空間。人行天橋作為城市公共建筑的一員，不僅起到連接與通行的作用，而且造型優(yōu)美、與環(huán)境融合協(xié)調(diào)的人行天橋還成為了城市中一道亮麗的風(fēng)景線。因此，人行天橋的造型日益成為城市建設(shè)決策者、公眾與設(shè)計(jì)師關(guān)注的重點(diǎn)，新穎的造型也層出不窮。

本文介紹了一座造型優(yōu)美的空間內(nèi)傾魚(yú)腹式鋼桁梁人行天橋的設(shè)計(jì)。魚(yú)腹式鋼桁架橋的應(yīng)用早已有之。例如上海市的浙江路橋，是一座跨越蘇州河的魚(yú)腹式鉚接鋼桁架橋，至今已有百余年的歷史[1-3]。但魚(yú)腹式鋼桁架多用于中小跨徑橋梁，近些年來(lái)應(yīng)用較少。

隨著社會(huì)需求，以及建筑材料、結(jié)構(gòu)分析水平的不斷發(fā)展，魚(yú)腹式鋼桁梁橋也可以推陳出新，通過(guò)結(jié)構(gòu)設(shè)計(jì)的創(chuàng)新，也能成為輕盈優(yōu)美的橋梁結(jié)構(gòu)型式?！?br>