基于EC法的風(fēng)浪聯(lián)合作用主塔-基礎(chǔ)體系極限荷載效應(yīng)
發(fā)布時(shí)間：2018-11-20 07:24
【摘要】：針對(duì)基于Rosenblatt映射變換的極限狀態(tài)曲線計(jì)算困難的現(xiàn)狀,提出了多維隨機(jī)變量極限狀態(tài)曲線的簡(jiǎn)化算法。該算法通過(guò)尋找同時(shí)滿足邊緣分布、聯(lián)合分布和可靠指標(biāo)的變量估計(jì)值,將隨機(jī)變量條件分布函數(shù)及其逆函數(shù)的求解轉(zhuǎn)化為邊緣分布函數(shù)的求逆,從而達(dá)到簡(jiǎn)化極限狀態(tài)曲線計(jì)算的目的。以某跨海大橋橋塔-基礎(chǔ)體系為工程實(shí)例,以潿洲島海洋站風(fēng)浪同步觀測(cè)資料為環(huán)境變量統(tǒng)計(jì)資料,通過(guò)基于Copula函數(shù)的聯(lián)合分布模型構(gòu)造了風(fēng)浪聯(lián)合分布函數(shù),根據(jù)簡(jiǎn)化算法計(jì)算了風(fēng)浪極限狀態(tài)曲線,利用EC法估計(jì)了橋塔-基礎(chǔ)體系的基底剪力極限荷載效應(yīng),并與外推法的估計(jì)結(jié)果進(jìn)行了比較。結(jié)果表明,基于簡(jiǎn)化算法和EC法的跨海大橋橋塔-基礎(chǔ)體系基底剪力極限荷載效應(yīng)具有較高的準(zhǔn)確性。
[Abstract]:In view of the difficulty of calculating limit state curve based on Rosenblatt mapping transformation, a simplified algorithm of limit state curve for multidimensional random variables is proposed. The algorithm transforms the conditional distribution function of random variables and its inverse function into the inverse of the edge distribution function by searching for the estimators of variables which satisfy the edge distribution, the joint distribution and the reliability index at the same time. In order to simplify the calculation of limit state curve. Taking the bridge tower foundation system of a sea crossing bridge as an engineering example, taking the wind and wave synchronous observation data of Weizhou Island Ocean Station as the environmental variable statistics data, the wind wave joint distribution function is constructed through the joint distribution model based on Copula function. According to the simplified algorithm, the wind wave limit state curve is calculated, and the ultimate load effect of the bridge tower-foundation system is estimated by using EC method, and the results are compared with those of the extrapolation method. The results show that the ultimate shear load effect of the tower and foundation system of cross-sea bridge based on simplified algorithm and EC method is accurate.
【作者單位】： 浙江大學(xué)建筑工程學(xué)院結(jié)構(gòu)工程研究所;
【基金】：交通運(yùn)輸部科技項(xiàng)目(2011318223170) 國(guó)家自然科學(xué)基金資助項(xiàng)目(51578504)
【分類號(hào)】：TU470
[Abstract]:In view of the difficulty of calculating limit state curve based on Rosenblatt mapping transformation, a simplified algorithm of limit state curve for multidimensional random variables is proposed. The algorithm transforms the conditional distribution function of random variables and its inverse function into the inverse of the edge distribution function by searching for the estimators of variables which satisfy the edge distribution, the joint distribution and the reliability index at the same time. In order to simplify the calculation of limit state curve. Taking the bridge tower foundation system of a sea crossing bridge as an engineering example, taking the wind and wave synchronous observation data of Weizhou Island Ocean Station as the environmental variable statistics data, the wind wave joint distribution function is constructed through the joint distribution model based on Copula function. According to the simplified algorithm, the wind wave limit state curve is calculated, and the ultimate load effect of the bridge tower-foundation system is estimated by using EC method, and the results are compared with those of the extrapolation method. The results show that the ultimate shear load effect of the tower and foundation system of cross-sea bridge based on simplified algorithm and EC method is accurate.
【作者單位】： 浙江大學(xué)建筑工程學(xué)院結(jié)構(gòu)工程研究所;
【基金】：交通運(yùn)輸部科技項(xiàng)目(2011318223170) 國(guó)家自然科學(xué)基金資助項(xiàng)目(51578504)
【分類號(hào)】：TU470
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