發(fā)布時間：2019-06-10 14:29

【摘要】：為了明確汽車荷載分項系數(shù)變化對橋梁構件可靠度水平的影響規(guī)律,利用校準法對受拉、受彎、大偏心受壓(短柱)、軸心受壓(短柱)、受剪共5類受力構件,選取0.1,0.25,0.5,1,1.5,2.5六種活恒載效應比,進行了不同汽車荷載分項系數(shù)條件下構件的可靠度分析。對于可靠度指標分布不均勻的狀況,提出了可靠度修正系數(shù)的概念并進行了驗證計算,對不同類型構件按照活恒載效應比給出了可靠度修正系數(shù)的計算結果。結果表明:汽車荷載分項系數(shù)由1.4遞增至2.4時,各類構件可靠指標均呈增大趨勢;活恒載效應比小于1時,該分項系數(shù)每增加0.2,構件可靠指標隨之增大0.1~0.3,活恒載效應比大于1時,該分項系數(shù)每增加0.2,構件可靠指標隨之增大約0.4;活恒載效應比大的構件可靠指標值偏高,且該類構件可靠指標受汽車荷載分項系數(shù)的影響也較大;所提出的可靠度修正系數(shù)能夠調(diào)整抗力值以達到目標可靠指標的要求,該系數(shù)分布于0.4~1.1之間,各類型構件可靠度修正系數(shù)分布規(guī)律一致,均隨活恒載效應比及汽車荷載分項系數(shù)的增大而減小。
[Abstract]:In order to determine the influence of the change of the sub-item coefficient of the vehicle load on the reliability level of the bridge member, the tension, the bending, the large eccentric compression (the short column), the axial compression (short column) and the shear-type 5 stress component are selected by the calibration method, and the six live dead load effect ratios of 0.1, 0.25, 0.5,1, 1.5, and 2.5 are selected, The reliability analysis of the component under the condition of the sub-coefficient of different vehicle loads is carried out. In this paper, the concept of reliability correction coefficient is put forward for the condition of non-uniform distribution of reliability index, and the calculation results of the reliability correction coefficient are given for different types of components according to the live-dead-load effect ratio. The results show that the reliability index of all kinds of components is increased by the increment of 1.4 to 2.4. When the ratio of live and dead load is less than 1, the reliability index of the component is increased by 0.2, the reliability index of the component is increased by 0.1-0.3, and the live-dead-load effect ratio is greater than 1. the reliability index of the component is higher than the large component reliability index value, and the reliability index of the component is greatly influenced by the vehicle load sub-item coefficient; the proposed reliability correction coefficient can adjust the resistance value to meet the requirement of the target reliable index, The coefficient is distributed between 0.4 and 1.1, and the distribution of the reliability correction coefficient of each type component is consistent, and the coefficient is reduced with the increase of the live and constant load effect ratio and the vehicle load sub-item coefficient.
【作者單位】： 長安大學公路學院;
【基金】：陜西省自然科學基礎研究計劃項目(2012JQ7004) 中央高�；�本科研業(yè)務費創(chuàng)新團隊項目(2013G3214010)
【分類號】：U441.2

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