架空结构快速抛填方案及构件受力特性研究
发布时间：2018-11-05 14:01
【摘要】：基于目前的填海造地工程填料需求量大、施工工期长,本文探索一种新的快速填海方式,通过抛填大量的预制钢筋混凝土构件,依靠构件之间的相互穿插、钳制形成架空结构,构件不断堆积后,露出水面形成陆域。本文设计并制作了4种构件的模型,分别为:箱笼型构件、短四脚锥体构件、长四脚锥体构件和直杆构件。通过大量的抛填试验,以长四脚锥体构件为底层,其余3种构件以每层不同数量的组合制定出9种抛填方案,进行逐次抛填,并对抛填后的结构进行静载荷试验,获得荷载与沉降量的关系曲线。用正交试验的数据处理方法分析每种方案结构产生的单位沉降量,以单位沉降量最小者为最优抛填方案;然后用最优抛填方案进行抛填,逐个记录每个构件上所受作用力的位置和来源,用数理统计的方法对受力频数进行分析,研究抛填后各种构件的受力特性;最后用有限元软件ABAQUS初步探索了受力方向对每种构件最大拉应力的影响规律。本文主要得到以下结论:(1)设计的9种抛填方案中,以每层均匀抛填直杆构件效果最好,因为直杆起到了相邻层箱笼型构件之间的连接、钳制作用,对减少沉降有利。(2)箱笼型构件棱上受到作用力的位置最有可能在整个棱边1/7处的附近,面上受到作用力概率最高的位置是外表面的正中间方孔边的中点处。短四脚锥体和长四脚锥体的圆杆上,受到作用力的位置最有可能在杆顶部附近。直杆上最有可能受到作用力的位置是直杆的底部附近。(3)箱笼型构件棱上受到作用力的来源主要是箱笼型构件和短四脚锥体,面上的受力来源主要是短四脚锥体和直杆构件。短四脚锥体受到作用力最主要的来源是箱笼型构件。直杆构件和长四脚锥体受力主要来源于箱笼型构件和地面的支撑。(4)根据有限元软件的计算结果,分析得到作用力方向对箱笼型构件的最大拉应力影响不大,对短四脚锥体、直杆构件和长四脚锥体影响较大。
[Abstract]:Based on the large demand for filling materials and the long construction period, this paper explores a new rapid reclamation method. By throwing a large number of precast reinforced concrete members and relying on the interlacing of the members, an overhead structure is formed. After the continuous accumulation of components, exposed water to form a land. In this paper, the models of four kinds of components are designed and made, which are box cage member, short four-legged cone member, long four-legged cone member and straight bar member. Through a large number of dumping tests, taking the long four-legged pyramidal component as the bottom layer, the remaining three kinds of components are combined with different numbers of each layer to work out 9 kinds of throwing schemes, and to carry out successive dumping and static load tests on the structure after throwing. The curve of relationship between load and settlement is obtained. The data processing method of orthogonal test is used to analyze the unit settlement produced by each scheme structure. Then, the optimal scheme is used to fill each member. The position and source of the force acting on each member are recorded one by one. The force frequency of each member is analyzed by mathematical statistics method, and the mechanical characteristics of each member are studied. Finally, the influence of stress direction on the maximum tensile stress of each member is preliminarily investigated by using the finite element software ABAQUS. The main conclusions of this paper are as follows: (1) among the nine kinds of throwing schemes designed, the straight bar member with uniform throwing bar on each floor is the best, because the straight bar acts as a connection between the cage members of the adjacent layer box and acts as a clamping effect. (2) the position where the force is applied on the edge of the cage member is most likely to be near 1 / 7 of the whole edge, and the position with the highest probability of the force on the surface is at the middle point of the middle hole edge of the outer surface. The position of force is most likely near the top of the short quadruped cone and the long four-legged cone. The position where the force is most likely to be applied on the straight bar is near the bottom of the bar. (3) the source of the force on the edge of the cage member is mainly the box cage member and the short four-legged cone. The stress source on the plane is mainly short quadruped cone and straight bar member. The main source of the force acting on the short quadruped cone is the cage member. The force of straight bar member and long four-legged cone is mainly from box cage member and ground support. (4) according to the calculation results of finite element software, it is concluded that the direction of force has little effect on the maximum tensile stress of box cage member. It has a great influence on the short quadruped cone, the straight bar member and the long quadruped cone.
【学位授予单位】：南京航空航天大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：P756.8
本文编号：2312298
[Abstract]:Based on the large demand for filling materials and the long construction period, this paper explores a new rapid reclamation method. By throwing a large number of precast reinforced concrete members and relying on the interlacing of the members, an overhead structure is formed. After the continuous accumulation of components, exposed water to form a land. In this paper, the models of four kinds of components are designed and made, which are box cage member, short four-legged cone member, long four-legged cone member and straight bar member. Through a large number of dumping tests, taking the long four-legged pyramidal component as the bottom layer, the remaining three kinds of components are combined with different numbers of each layer to work out 9 kinds of throwing schemes, and to carry out successive dumping and static load tests on the structure after throwing. The curve of relationship between load and settlement is obtained. The data processing method of orthogonal test is used to analyze the unit settlement produced by each scheme structure. Then, the optimal scheme is used to fill each member. The position and source of the force acting on each member are recorded one by one. The force frequency of each member is analyzed by mathematical statistics method, and the mechanical characteristics of each member are studied. Finally, the influence of stress direction on the maximum tensile stress of each member is preliminarily investigated by using the finite element software ABAQUS. The main conclusions of this paper are as follows: (1) among the nine kinds of throwing schemes designed, the straight bar member with uniform throwing bar on each floor is the best, because the straight bar acts as a connection between the cage members of the adjacent layer box and acts as a clamping effect. (2) the position where the force is applied on the edge of the cage member is most likely to be near 1 / 7 of the whole edge, and the position with the highest probability of the force on the surface is at the middle point of the middle hole edge of the outer surface. The position of force is most likely near the top of the short quadruped cone and the long four-legged cone. The position where the force is most likely to be applied on the straight bar is near the bottom of the bar. (3) the source of the force on the edge of the cage member is mainly the box cage member and the short four-legged cone. The stress source on the plane is mainly short quadruped cone and straight bar member. The main source of the force acting on the short quadruped cone is the cage member. The force of straight bar member and long four-legged cone is mainly from box cage member and ground support. (4) according to the calculation results of finite element software, it is concluded that the direction of force has little effect on the maximum tensile stress of box cage member. It has a great influence on the short quadruped cone, the straight bar member and the long quadruped cone.
【学位授予单位】：南京航空航天大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：P756.8
【参考文献】
相关期刊论文 前1条
1 朴正;马小舟;董国海;;斜坡式防波堤人工护面块体稳定重量计算公式研究[J];中国港湾建设;2013年03期
，本文编号：2312298
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