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方志禾 王眾毅 杜自力
（北京市市政專業(yè)設(shè)計院 100037）[提要] 介紹了路口人行天橋采用的正交預(yù)應(yīng)力系桿空間剛架的特征、靜動力分析和結(jié)構(gòu)設(shè)計。用系桿對整個剛架施加預(yù)應(yīng)力，用支座使空間剛架實現(xiàn)完全對稱、減震、消能，經(jīng)體系轉(zhuǎn)換，將分段預(yù)制的構(gòu)件組成空間剛架。采用空間梁單元建模，進(jìn)行了自振頻率核算及地震力計算，并進(jìn)行了截面、岔口區(qū)域及剛架角隅的設(shè)計，可供同類設(shè)計時參考。
[關(guān)鍵詞] 人行天橋 預(yù)應(yīng)力系桿 剛架 結(jié)構(gòu)分析The two dimensional orthogonal steel rigid frame with a ring box beam, four curved box beams and four straight stepped beams,and a pair of cross prestressed tie bars at the lower end of its columns, is very suitable for pedestrian bridge at the crossing of two urban truck roads.Two bridges have been designed in Beijing for the crossing of truck roads with the width of 49.0m. The diagonal spans of the rigid frames are 69. 30m. Authors introduce the structural characteristics and details, i.e: the prestressed ties, the bearings, the knees, the intersecting areas between the curved box beam and the ring box beam, and that between the curved box beam and the straight box beam.The methods of static and dynamic analysis for the rigid frame are also introduced.
Keywords: pedestrian bridge; rigid frame; prestressed tie bar; structural analysis
