PHC桩—重力式挡墙复合结构在码头改造工程中的应用
发布时间：2018-10-23 16:43
【摘要】：码头结构加固与改造是通过对在役老码头进行检测、评估、加固及改造等技术措施,恢复受损码头结构的原有功能并满足其使用要求,或者提高已有码头结构的承载力和稳定性以满足结构荷载增加及使用功能改变等要求。随着一批老码头达到设计使用年限,以及船舶大型化、专业化发展趋势迅猛,我国港口工程即将进入大规模的码头结构加固改造时期。然而,目前国内对码头结构加固改造的研究较少,尤其是PHC桩-重力式挡墙复合结构码头加固改造的设计理论和计算方法远落后于工程实践。本文利用理论分析和有限元数值模拟方法针对PHC桩-重力式挡墙复合结构加固与改造技术开展了一系列研究工作,主要研究内容和结论如下:1、分析了码头结构加固改造的研究现状及应用前景,找出目前研究中亟待解决的关键问题,并通过分析指出码头结构加固改造是十分必要并且可行的。2、根据PHC桩-重力式挡墙复合结构在极限状态下的受力平衡,建立了基于混凝土重力式挡墙结构稳定性验算模式的抗滑移、抗倾覆稳定性简化计算方法;同时在现有规范的稳定性计算方法基础上推导出适用于桩基-重力式挡墙复合结构的规范修正法。3、利用有限元法对PHC桩-重力式挡墙复合结构进行分析,以Robot Structural有限元分析软件为平台,建立了复合结构的二维弹塑性有限元模型,主要包括结构及土体本构模型的选取、接触面的模拟、计算域的选取、边界条件的定义及网格划分等关键问题。4、以佛山中外运仓码有限公司码头结构加固改造工程为工程实例,根据工程条件和设计要求将原重力式挡墙结构加固改造成PHC桩-重力式挡墙复合结构,并分别利用本文提出的稳定性计算方法和有限元数值模拟方法对加固改造前后的码头结构进行分析计算。分析结果表明PHC桩-重力式挡墙复合结构受力明确,两种结构型式能够很好地协同工作、共同受力,通过增加桩基能够有效减小码头结构的位移、应力和底部滑移,显著提高码头结构的稳定性和承载力。
[Abstract]:The reinforcement and reconstruction of the structure of the wharf is to restore the original function of the damaged wharf structure and meet the requirements of its use through the technical measures such as inspection, evaluation, reinforcement and reconstruction of the existing old wharf in service. Or to improve the bearing capacity and stability of the existing wharf structure to meet the requirements of structural load increase and function change. With a lot of old wharves reaching the design life, as well as large-scale ships, the trend of professional development is swift and violent, the port engineering in China is about to enter the period of large-scale wharf structure reinforcement and transformation. However, there are few researches on the reinforcement and reconstruction of wharf structure at present, especially the design theory and calculation method of PHC pile-gravity retaining wall composite structure wharf reinforcement and reconstruction lags far behind the engineering practice. In this paper, theoretical analysis and finite element numerical simulation method are used to carry out a series of research work on the reinforcement and reconstruction technology of PHC pile-gravity retaining wall composite structure. The main research contents and conclusions are as follows: 1. The present research situation and application prospect of wharf structure reinforcement and reconstruction are analyzed, and the key problems to be solved in the present research are found out. Through analysis, it is pointed out that it is very necessary and feasible to strengthen the wharf structure. 2. According to the stress balance of PHC pile-gravity retaining wall composite structure under the limit state, A simplified calculation method of anti-slip and anti-overturning stability is established based on the checking model of the stability of concrete gravity retaining wall. At the same time, on the basis of the stability calculation methods of the existing codes, a modified method for the composite structure of pile-gravity retaining wall is derived. 3. The finite element method is used to analyze the composite structure of PHC pile-gravity retaining wall. A two-dimensional elastic-plastic finite element model of composite structure is established on the platform of Robot Structural software. It mainly includes the selection of constitutive model of structure and soil, the simulation of contact surface and the selection of calculation domain. The definition of boundary conditions and the key problems such as grid division. 4. Taking the project of strengthening and rebuilding wharf structure of Foshan Sinotrans Warehouse Code Co., Ltd., as an engineering example, According to the engineering conditions and design requirements, the original gravity retaining wall structure was strengthened and transformed into PHC pile-gravity retaining wall composite structure. The stability calculation method and finite element numerical simulation method proposed in this paper are used to analyze and calculate the wharf structure before and after reinforcement. The analysis results show that the PHC pile-gravity retaining wall composite structure has a clear force, the two types of structure can work together well, and the pile foundation can effectively reduce the displacement, stress and bottom slip of the wharf structure by increasing the pile foundation. The stability and bearing capacity of wharf structure are improved significantly.
【学位授予单位】：天津大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U657
本文编号：2289863
[Abstract]:The reinforcement and reconstruction of the structure of the wharf is to restore the original function of the damaged wharf structure and meet the requirements of its use through the technical measures such as inspection, evaluation, reinforcement and reconstruction of the existing old wharf in service. Or to improve the bearing capacity and stability of the existing wharf structure to meet the requirements of structural load increase and function change. With a lot of old wharves reaching the design life, as well as large-scale ships, the trend of professional development is swift and violent, the port engineering in China is about to enter the period of large-scale wharf structure reinforcement and transformation. However, there are few researches on the reinforcement and reconstruction of wharf structure at present, especially the design theory and calculation method of PHC pile-gravity retaining wall composite structure wharf reinforcement and reconstruction lags far behind the engineering practice. In this paper, theoretical analysis and finite element numerical simulation method are used to carry out a series of research work on the reinforcement and reconstruction technology of PHC pile-gravity retaining wall composite structure. The main research contents and conclusions are as follows: 1. The present research situation and application prospect of wharf structure reinforcement and reconstruction are analyzed, and the key problems to be solved in the present research are found out. Through analysis, it is pointed out that it is very necessary and feasible to strengthen the wharf structure. 2. According to the stress balance of PHC pile-gravity retaining wall composite structure under the limit state, A simplified calculation method of anti-slip and anti-overturning stability is established based on the checking model of the stability of concrete gravity retaining wall. At the same time, on the basis of the stability calculation methods of the existing codes, a modified method for the composite structure of pile-gravity retaining wall is derived. 3. The finite element method is used to analyze the composite structure of PHC pile-gravity retaining wall. A two-dimensional elastic-plastic finite element model of composite structure is established on the platform of Robot Structural software. It mainly includes the selection of constitutive model of structure and soil, the simulation of contact surface and the selection of calculation domain. The definition of boundary conditions and the key problems such as grid division. 4. Taking the project of strengthening and rebuilding wharf structure of Foshan Sinotrans Warehouse Code Co., Ltd., as an engineering example, According to the engineering conditions and design requirements, the original gravity retaining wall structure was strengthened and transformed into PHC pile-gravity retaining wall composite structure. The stability calculation method and finite element numerical simulation method proposed in this paper are used to analyze and calculate the wharf structure before and after reinforcement. The analysis results show that the PHC pile-gravity retaining wall composite structure has a clear force, the two types of structure can work together well, and the pile foundation can effectively reduce the displacement, stress and bottom slip of the wharf structure by increasing the pile foundation. The stability and bearing capacity of wharf structure are improved significantly.
【学位授予单位】：天津大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U657
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