基于細觀結(jié)構(gòu)塑性鉸區(qū)彎矩曲率和墩頂推力位移關(guān)系的數(shù)值模型研究*
陳 成1,曾祥國1,唐光武2,陳華燕1
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（1 四川大學(xué)建筑與環(huán)境學(xué)院，成都 610065；2 重慶交通科研設(shè)計院，重慶 400067）[摘要] 根據(jù)橋梁矩形截面內(nèi)混凝土和鋼筋的細觀結(jié)構(gòu)，分別建立了HRB335鋼筋彈塑性強化本構(gòu)關(guān)系和C25優(yōu)化的約束混凝土本構(gòu)關(guān)系，利用平截面假設(shè)，采用變形曲率加載，以受壓區(qū)邊緣應(yīng)變作為中間參量，發(fā)展了一種非線性迭代算法，獲得了矩形截面橋墩彎矩-曲率和橫向推力-墩頂位移的關(guān)系曲線。并與現(xiàn)有的試驗結(jié)果進行了比較，結(jié)果表明：發(fā)展的基于細觀結(jié)構(gòu)塑性鉸區(qū)彎矩-曲率和墩頂推力-位移關(guān)系的數(shù)值模型預(yù)測的結(jié)果與試驗吻合較好。提出的模型和相適應(yīng)的非線性迭代算法對于橋梁的延性設(shè)計與橋梁結(jié)構(gòu)的安全性評定具有重要的理論意義和工程應(yīng)用價值。[關(guān)鍵詞] 橋墩;迭代算法; 數(shù)值模型; 彎矩曲率; 塑性鉸中圖分類號：TU375 文獻標(biāo)識碼：A 文章編號：1002-848X(2013)S2-0445-04*橋梁工程結(jié)構(gòu)動力學(xué)國家重點實驗室開放基金（201201），橋梁結(jié)構(gòu)抗震技術(shù)交通行業(yè)重點實驗室資助（201201），教育部創(chuàng)新團隊計劃項目（ITR1027）。作者簡介：陳成，碩士研究生，Email: chenchengnantong@gmail.com。Numerical model study of the relationship of moment-curvature and thrust-displacement in the plastic hinge zone based on mesostructureChen Cheng11, Zeng Xiangguo11, Tang Guangwu2, Chen Huayan11（1 College of Architecture and Environment , Sichuan University, Chengdu 610065, China; 2 Chongqing Communication Research & Design Institute, Chongqing 400067,.Cnina）Abstract: The constitutive relations of HRB335 rebar and C25 confined concrete have established separately according to the mesostructures of the rebar and concrete in the bridge pier. With the plane section assumption, loaded by curvature, the compression zone edge of the strain as intermediate parameters, a nonlinear iterative algorithm was developed and the relationship of moment-curvature and thrust-displacement was got. Compared with existing experimental results, the results based on our model are in good agreement with the experimental results. Therefore, the method and the nonlinear iterative algorithm have important theoretical significance and value in engineering about the ductility design of a bridge and the evaluation of the safety of a bridge.Keywords: bridge pier; iterative algorithm; numerical model; moment-curvature; plastic hinge
