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(中國建筑西北設(shè)計(jì)研究院有限公司, 西安 710018)

摘要: 西安國際港務(wù)區(qū)中軸生態(tài)公園人行橋的橋面系采用鋼-混凝土組合結(jié)構(gòu)。 采用兩階段受力分析方法對?混凝土組合橋面系的承載能力極限狀態(tài)進(jìn)行驗(yàn)算。 在進(jìn)行組合橋面系抗彎承載力驗(yàn)算時(shí),剪力滯后效應(yīng)和鋼與混凝土界面剪力傳遞程度是影響組合結(jié)構(gòu)受力性能的兩個(gè)關(guān)鍵因素。 鋼筋混凝土橋面板采用非線性殼單元模擬,合理地考慮剪力滯后效應(yīng)對組合梁有效翼緣寬度的影響;抗剪栓釘分別采用非線性彈簧和剛性連接兩種方式模擬,合理地考慮界面滑移對組合結(jié)構(gòu)受力的影響。 為控制基礎(chǔ)及墩柱尺寸,墩柱與梁體結(jié)構(gòu)連接位置采用高阻尼隔震橡膠支座,進(jìn)行 E2 地震作用下的隔震驗(yàn)算。 結(jié)果表明,采用高阻尼隔震橡膠支座可有效降低墩柱在地震作用下的水平剪力,從而減小墩柱根部的彎矩。 對組合橋面系進(jìn)行人群有節(jié)奏運(yùn)動的激勵(lì)與人群自由行走激勵(lì)兩種工況下的舒適度驗(yàn)算,驗(yàn)算結(jié)果滿足規(guī)范要求。

關(guān)鍵詞: 人行橋; 鋼-混凝土組合橋面系; 兩階段受力分析方法; 滑移效應(yīng); 隔震分析; 舒適度驗(yàn)算

中圖分類號:TU318+. 2 文獻(xiàn)標(biāo)志碼:A 文章編號:1002-848X(2022)11-0064-08

DOI:10. 19701 / j. jzjg. XBY2208

Structural design on footbridge of central axis ecological park of Xi’ an International Trade

and Logistics Park

WANG Lianying, LIU Bin, LÜ Xudong, GAO Zeyu, LUO Guqiu

(China Northwest Architecture Design and Research Institute Co. , Ltd. , Xi’ an 710018, China)

Abstract: The bridge deck of footbridge of central axis ecological park of Xi’ an International Trade and Logistics Park adopts the steel-concrete composite structure. The limit state of the bearing capacity of the steel-concrete composite bridge deck system was checked by two-stage force analysis method. When checking the flexural bearing capacity of the composite bridge deck system, the shear lag effect and the degree of shear force transfer at the interface between steel and concrete are two key factors that affect the mechanical performance of the composite structure. The reinforced concrete bridge deck was simulated by adopting nonlinear shell elements, which reasonably considers the influence of shear lag effect on the effective flange width of composite beams. The shear studs were simulated by nonlinear spring and rigid connection respectively, which reasonably considers the influence of interface slip on the force of the composite structure. In order to control the size of the foundation and the pier column, the high damping isolation rubber bearing was used at the connection position of the pier column and the beam structure, and the seismic isolation check under the action of the E2 earthquake was carried out. The results show that the high damping isolation rubber bearing can effectively reduce the horizontal shear force of the pier column under the action of earthquake, thereby reducing the bending moment at the root of the pier column. For the combined bridge deck system, the comfort degree check was carried out under the two conditions of the crowd’ s rhythmic motion excitation and the crowd’ s free walking excitation, and the check calculation results meet the requirements of thecode.

Keywords:footbridge;steel-concrete composite bridge deck system; two-stage force analysis method; interface slip effect;seismic isolation analysis; comfort check