| In this paper,the component importance evaluation methods based on the generalized stiffness and the average stress ratio were uesd to evaluate the structural importance of the single-row and triple-row frames of the three-story high-pile frame wharf.Then,find out the distribution of the importance of the three-story high-pile frame wharf structural elements,and compare the importance coefficients of the wharf structures in the case of single-row and triple-row frames;and compare the importance evaluation methods.Afterwards,using the generalized stiffness method to evaluate the importance of the components of the double-heeled high-framed frame wharf in the three-bay structure,and compare the similarities and differences between the importance factors of the components in the two-story and three-story high-pile frame piers.Based on the calculation results of the above-mentioned,the weights of the impotance evaluation indexes of the upper structural members of the frame wharf were found out.The main research results are as follows:(1)In the high pile-frame wharf,the pile foundations on both sides and the rear pillars are relatively important components.The importance of various types of components is roughly expressed as:pile>column>beam>cross bracing,which is consistent with the principle of "strong column and weak beam" emphasized in the seismic design of buildings.In the case of designing high water level,the lateral transverse transfer path of ship’s force is:force member→upper cross member→middle column→pile foundation;in the case of designing low water level,the lateral transverse transfer path of ship’s force is:force member→lower cross member→pile foundation.Therefore,the importance factor of the components in front of the quay is greatly affected by the ship’s forces.(2)The distribution rules of the importance factors of the members in the case of single-row of three-story high-pile frame wharf are roughly similar to the internal and external shelving in the case of three-row frame.The order of the importance coefficient of similar components is:single row frame>inner row frame>outer row frame.However,in the case of a three-row frame,the external load arrangement can better reflect the actual situation of the pier structure;the coefficient of importance of the components is less affected by the external load;and the importance factor of the components of the panel,longitudinal beams and longitudinal braces can be calculated.(3)Under the same working condition,the difference of component importance coefficient which were calculated by using the generalized stiffness method is relatively large,and the component importance coefficient is convenient for comparison and has certain physical significance.The component importance coefficient which were calculated by using the average stress ratio method is greatly affected by the external load,and it is easy to find the condition which is more unfavorable to the overall structure;however,under the same working condition,the difference of the importance coefficients between the components are too small.It’s not conducive to comparison.(4)The importance coefficients of the components in the double-layer high-pile frame wharf and the three-layer high-pile frame wharf are roughly similar.However,in the double-layer high-pile frame wharf structure,due to the large height,the importance factors of the front members of the piers such as the front pillars and the front span beams are more affected by the external loads.(5)In combination with the analytic hierarchy process,the index weights based on the evaluation of the importance of components are proposed.In the three-story high pile frame wharf and double-layer high pile frame wharf,the weights of various components in the superstructure are roughly similar,The weight ranges of various types of components are as follows:0.536 to 0.546 for columns,0.2 to 0.235 for beams,0.111 to 0.125 for stringers,0.071 to 0.078 for panels,and 0.047 to 0.051 for horizontal and vertical supports. |
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