重力式码头抗震若干问题研究

发布时间：2018-04-26 08:38

本文选题：重力式码头 + 抗震　；参考：《大连理工大学》2016年博士论文

【摘要】：重力式码头作为三大码头结构形式之一,广泛应用于港口工程。历次震害表明,一旦码头结构在地震中遭到破坏,受影响的不仅是码头结构本身,更主要的是码头失去功能、停止运营造成的经济损失。所以,对重力式码头的抗震计算方法进行研究具有重要意义。与国外码头抗震设计采用的基于位移和基于性能的抗震设计理念和方法相比,我国目前采用的基于力抗震设计方法有诸多不足之处。鉴于此,本文以基于位移的重力式码头抗震设计概念为出发点,对地震中土超孔隙水压力时程的计算方法、成层土静土压力和动土压力的计算方法、地震作用下重力式码头滑动和转动位移的简化计算方法、滑动和转动耦合下的位移计算方法、基于性能的重力式码头动力时程分析等进行了研究。主要研究内容如下：1、结合累积损伤原理和超孔隙水压力计算方法中的应力法,提出可较真实反映超孔隙水压力时程的计算方法。通过与以往超孔压比时程的研究结果进行对比,验证了所提方法的有效性。2、提出曲破裂面成层土的静土压力和动土压力计算方法。通过与土压力试验结果进行对比,验证了所提方法的有效性。采用所提的土压力计算方法,研究了地震动参数和土体参数对土压力计算结果的影响。3、采用多次曲线对土的破裂面进行简化,提出更为简单的成层土静土压力和动土压力计算方法,并将这种方法用于码头后填土不同剩余水位情况的静土压力和动土压力计算。4、基于本文提出的土超孔隙水压力时程计算方法和土压力计算方法,提出输入地震波下饱和砂填土重力式码头位移的计算方法。通过与以往研究结果的对比,论证了所提方法的有效性。研究了地震动参数和土体条件对重力式码头位移的影响,并研究了地震作用下重力式码头滑动和转动的耦合作用。5、对重力式码头进行了动力时程分析,研究了码头地基和墙后填土中孔隙水压力的变化和重力式码头变形。
[Abstract]:Gravity wharf, as one of the three types of wharf structure, is widely used in port engineering. The previous earthquake damage shows that once the wharf structure is damaged in the earthquake, it is not only the wharf structure itself that is affected, but also the economic loss caused by the loss of the function of the wharf and the suspension of the operation. Therefore, it is of great significance to study the seismic calculation method of gravity wharf. Compared with the displacement-based and performance-based seismic design concepts and methods used in the seismic design of wharf in foreign countries, there are many shortcomings in the method of seismic design based on force used at present in our country. In view of this, based on the concept of seismic design of gravity wharf based on displacement, the method of calculating the time history of soil excess pore water pressure in earthquake, the calculation method of static soil pressure and dynamic earth pressure of layered soil is presented in this paper. The simplified calculation method of sliding and rotational displacement of gravity wharf under earthquake action, the displacement calculation method under sliding and rotating coupling, and the dynamic time history analysis of gravity wharf based on performance are studied. The main research contents are as follows: 1. Combined with the cumulative damage principle and the stress method in the calculation method of excess pore water pressure, a calculation method which can truly reflect the time history of excess pore water pressure is put forward. The validity of the proposed method is verified by comparing with the results of the previous study on the time history of superpore pressure ratio, and the calculation method of static and dynamic earth pressure of laminated soil with curved fracture surface is proposed. The effectiveness of the proposed method is verified by comparing with the soil pressure test results. The influence of the parameters of ground motion and soil on the calculation results of earth pressure is studied by using the proposed calculation method of earth pressure, and the fracture surface of soil is simplified by multiple curves. A simpler method for calculating static and dynamic earth pressure of stratified soil is presented. This method is applied to calculate static soil pressure and dynamic earth pressure in the case of different residual water levels behind the wharf, based on the time-history calculation method of soil excess pore water pressure and the calculation method of earth pressure proposed in this paper. A method for calculating the displacement of saturated sand fill gravity wharf under the input seismic wave is presented. The effectiveness of the proposed method is demonstrated by comparing with the previous research results. The influence of ground motion parameters and soil conditions on the displacement of gravity wharf is studied. The coupling action of sliding and rotating of gravity wharf under earthquake is studied. The dynamic time history analysis of gravity wharf is carried out. The variation of pore water pressure and the deformation of gravity wharf are studied.
【学位授予单位】：大连理工大学
【学位级别】：博士
【学位授予年份】：2016
【分类号】：U656.111

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