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一種半整體式橋臺(tái)橋梁搭板的內(nèi)力計(jì)算方法

2016-11-09 14:45莊一舟徐亮黃炎準(zhǔn)

莊一舟++徐亮++黃炎準(zhǔn)

摘要:針對(duì)半整體式橋臺(tái)橋梁(SIAB)搭板與普通有縫橋梁搭板的不同受力情況,基于概率統(tǒng)計(jì)法和簡(jiǎn)支梁法,考慮搭板尺寸、地基剛度的影響,提出了適用于SIAB搭板內(nèi)力計(jì)算的簡(jiǎn)支梁修正法,通過(guò)對(duì)搭板計(jì)算長(zhǎng)度的修正來(lái)等效彈性地基作用和主梁傳遞至搭板端部的水平力作用。采用有限元分析對(duì)比了簡(jiǎn)支梁法、彈性地基梁法與簡(jiǎn)支梁修正法。結(jié)果表明:簡(jiǎn)支梁修正法在SIAB搭板的內(nèi)力計(jì)算中更為合理和簡(jiǎn)便,半整體式橋梁搭板的內(nèi)力計(jì)算可按簡(jiǎn)支梁進(jìn)行計(jì)算。

關(guān)鍵詞:半整體式橋臺(tái)橋梁;搭板;簡(jiǎn)支梁修正法;彈性地基模型

中圖分類(lèi)號(hào):U442.5 文獻(xiàn)標(biāo)志碼:A

摘要:針對(duì)半整體式橋臺(tái)橋梁(SIAB)搭板與普通有縫橋梁搭板的不同受力情況,基于概率統(tǒng)計(jì)法和簡(jiǎn)支梁法,考慮搭板尺寸、地基剛度的影響,提出了適用于SIAB搭板內(nèi)力計(jì)算的簡(jiǎn)支梁修正法,通過(guò)對(duì)搭板計(jì)算長(zhǎng)度的修正來(lái)等效彈性地基作用和主梁傳遞至搭板端部的水平力作用。采用有限元分析對(duì)比了簡(jiǎn)支梁法、彈性地基梁法與簡(jiǎn)支梁修正法。結(jié)果表明:簡(jiǎn)支梁修正法在SIAB搭板的內(nèi)力計(jì)算中更為合理和簡(jiǎn)便,半整體式橋梁搭板的內(nèi)力計(jì)算可按簡(jiǎn)支梁進(jìn)行計(jì)算。

關(guān)鍵詞:半整體式橋臺(tái)橋梁;搭板;簡(jiǎn)支梁修正法;彈性地基模型

中圖分類(lèi)號(hào):U442.5 文獻(xiàn)標(biāo)志碼:A

SIAB根據(jù)簡(jiǎn)支梁法得搭板內(nèi)力計(jì)算的控制彎矩值M為

M=18(q1+q2)l2+qL(0.2+2d)(l2-0.7)

(1)

式中:qL為車(chē)輛荷載作用下的均布荷載;q1為搭板上橋面鋪裝的重量;q2為搭板的重量;d為鋪裝厚度;l為沖擊系數(shù)。

5 結(jié) 語(yǔ)

(1)隨著水平基床系數(shù)的增大,有限元計(jì)算值越接近理論計(jì)算值。當(dāng)Kx=18 000 kN·m-3時(shí),兩者吻合良好。隨著豎向基床系數(shù)的增大,有限元計(jì)算值越偏離理論計(jì)算值。當(dāng)Kz=5 000 kN·m-3時(shí),兩者吻合良好。隨著溫降荷載的增大,有限元計(jì)算值越接近理論計(jì)算值。當(dāng)ΔT=30 ℃時(shí),兩者吻合良好。

(2)各參數(shù)導(dǎo)致搭板端部水平力增大時(shí),搭板端部水平力逐漸替代豎向荷載成為影響搭板底緣拉應(yīng)力的主要因素。搭板底面最大應(yīng)力會(huì)出現(xiàn)位置前移現(xiàn)象,搭板近臺(tái)端底面應(yīng)力水平高于遠(yuǎn)臺(tái)端。

(3)簡(jiǎn)支梁修正法設(shè)計(jì)配筋受拉區(qū)鋼筋應(yīng)力均保持較高應(yīng)力水平,約為鋼筋抗拉強(qiáng)度的70%。

(4)簡(jiǎn)支梁法計(jì)算設(shè)計(jì)的搭板受拉區(qū)鋼筋應(yīng)力始終為最小,均在鋼筋抗拉強(qiáng)度的50%以下,配筋偏于剛性。簡(jiǎn)支梁法設(shè)計(jì)的搭板底緣最大應(yīng)力水平在混凝土抗拉強(qiáng)度設(shè)計(jì)值的50%以下,設(shè)計(jì)偏于保守;簡(jiǎn)支梁修正法的搭板底緣最大應(yīng)力約為混凝土抗拉強(qiáng)度設(shè)計(jì)值的36%,設(shè)計(jì)較為合理。

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