FRP及钢筋混凝土约束钢管混凝土短柱轴压承载力研究
发布时间：2018-12-16 03:44
【摘要】：随着钢管混凝土构件的普遍应用,钢管混凝土构件的缺点也暴露出来,性能更优良的约束钢管混凝土构件弥补了钢管混凝土的不足,有着更大的发展前景。约束钢管混凝土构件中的FRP约束钢管混凝土构件和叠合柱以其施工方便、承载力高、耐久性好的优点得到学者的广泛研究。目前,对于FRP-混凝土-钢管组合实心方形短柱的研究较少,提出的FRP-混凝土-钢管组合实心方形短柱以及方形高强钢管混凝土叠合柱轴压承载力公式缺乏理论依据,且过多的进行了简化。本文采用理论分析和数值模拟相结合的方法,根据FRP-混凝土-钢管组合实心方形短柱以及方形高强钢管混凝土叠合柱的受力机理,推导出两种类型构件的轴压承载力公式,对两类构件进行静力数值分析。本文具体内容如下:以FRP-混凝土-钢管组合实心方形短柱为研究对象,根据夹层混凝土受到约束作用的不同,将其划分为有效约束区和非有效约束区;同时考虑夹层混凝土受到的双重约束,将方形FRP布转化为圆形FRP布。基于统一强度理论,考虑中间主应力、材料拉压比以及倒角半径的影响,推导得到FRP-混凝土-钢管组合实心方形短柱的轴压承载力计算公式。将理论计算结果和相关文献试验结果对比,吻合良好,并分析了中间主应力系数、侧压系数、倒角半径、钢管径厚比对轴压承载力的影响。对于新提出的方形高强钢管混凝土叠合柱的极限承载力,考虑中间主应力和材料拉压比的影响,引入有效约束系数和非有效约束系数考虑箍筋对钢管外混凝土约束作用的不同,把钢管外箍筋约束混凝土划分为有效约束区和非有效约束区,将方形截面等效为圆形截面以考虑钢管核心混凝土受到的钢管和外围钢筋混凝土的双重约束效应,提出了方形高强钢管混凝土叠合柱一种新的轴压极限承载力计算方法。将所得理论计算结果与文献试验结果进行对比,吻合良好,证明了公式的正确性。对各参数的影响规律分析表明,方形高强钢管混凝土叠合柱的承载力随着侧压系数、中间主应力影响系数、材料拉压比和纵向配筋率的增大而增大,随着钢管径厚比的增大而减小。应用ANSYS分析软件,对FRP-混凝土-钢管组合实心方形短柱以及叠合柱进行数值模拟,通过与构件试验值、理论计算值的对比,验证了数值模拟的合理性。数值模拟与理论计算的良好吻合,保证得到的构件变形图和应力场分布图的正确性,从而对构件的受力特征、承载力影响参数以及破坏形式进行分析。
[Abstract]:With the widespread application of concrete-filled steel tube members, the shortcomings of concrete filled steel tube members are exposed, and the concrete filled steel tube members with better performance make up for the shortcomings of concrete filled steel tubular members and have a greater development prospect. FRP confined concrete filled steel tubular members and composite columns are widely studied for their advantages of convenient construction, high bearing capacity and good durability. At present, there is little research on FRP- concrete-steel tube composite solid square short columns, and the formula of axial compression capacity of FRP- concrete-steel tube composite square short columns and square high strength concrete filled steel tube composite columns is lack of theoretical basis. And too much simplification. In this paper, the method of theoretical analysis and numerical simulation is used to deduce the axial bearing capacity formulas of two types of members according to the stress mechanism of FRP- concrete filled steel tube composite solid square short columns and square high strength concrete filled steel tube composite columns. Static numerical analysis of two kinds of components is carried out. The main contents of this paper are as follows: taking the FRP- concrete-steel tube composite solid square short column as the research object, according to the different constraint action of sandwich concrete, it can be divided into effective confinement zone and non-effective constraint zone; At the same time, considering the double constraint of sandwich concrete, the square FRP cloth is transformed into circular FRP cloth. Based on the unified strength theory and taking into account the influence of the intermediate principal stress, the ratio of material tension to compression and the radius of chamfer, the formula for calculating the axial compression capacity of FRP- concrete-steel tube composite solid square short columns is derived. The theoretical calculation results are in good agreement with the experimental results, and the effects of the intermediate principal stress coefficient, lateral pressure coefficient, chamfer radius and ratio of diameter to thickness of steel pipe on axial compression capacity are analyzed. Considering the influence of the intermediate principal stress and the ratio of material tension and compression to the ultimate bearing capacity of the newly proposed square high strength concrete filled steel tube composite columns, the effective constraint coefficient and the non-effective constraint coefficient are introduced to consider the difference of the confinement effect of stirrups on concrete filled steel tube. The external stirrups confined concrete of steel tube is divided into effective confinement zone and non-effective confinement zone. The square section is equivalent to a circular section to consider the double confinement effect of the steel tube and the peripheral reinforced concrete subjected to the core concrete of the steel tube. A new method for calculating the ultimate bearing capacity of concrete filled square steel tube columns under axial compression is presented. The theoretical results are in good agreement with the experimental results, and the formula is proved to be correct. The analysis of the influence law of each parameter shows that the bearing capacity of square high strength concrete filled steel tube composite columns increases with the increase of lateral pressure coefficient, the influence coefficient of intermediate principal stress, the ratio of material tension to compression and the ratio of longitudinal reinforcement. With the increase of diameter to thickness ratio of steel pipe, it decreases. The numerical simulation of FRP- concrete-steel pipe composite solid square short column and composite column is carried out by using ANSYS software. The rationality of the numerical simulation is verified by comparing with the experimental value and the theoretical calculation value of the member. The numerical simulation is in good agreement with the theoretical calculation, which ensures the correctness of the obtained deformation diagram and stress field distribution diagram, and analyzes the mechanical characteristics, bearing capacity influence parameters and failure form of the member.
【学位授予单位】：长安大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TU398.9
本文编号：2381770
[Abstract]:With the widespread application of concrete-filled steel tube members, the shortcomings of concrete filled steel tube members are exposed, and the concrete filled steel tube members with better performance make up for the shortcomings of concrete filled steel tubular members and have a greater development prospect. FRP confined concrete filled steel tubular members and composite columns are widely studied for their advantages of convenient construction, high bearing capacity and good durability. At present, there is little research on FRP- concrete-steel tube composite solid square short columns, and the formula of axial compression capacity of FRP- concrete-steel tube composite square short columns and square high strength concrete filled steel tube composite columns is lack of theoretical basis. And too much simplification. In this paper, the method of theoretical analysis and numerical simulation is used to deduce the axial bearing capacity formulas of two types of members according to the stress mechanism of FRP- concrete filled steel tube composite solid square short columns and square high strength concrete filled steel tube composite columns. Static numerical analysis of two kinds of components is carried out. The main contents of this paper are as follows: taking the FRP- concrete-steel tube composite solid square short column as the research object, according to the different constraint action of sandwich concrete, it can be divided into effective confinement zone and non-effective constraint zone; At the same time, considering the double constraint of sandwich concrete, the square FRP cloth is transformed into circular FRP cloth. Based on the unified strength theory and taking into account the influence of the intermediate principal stress, the ratio of material tension to compression and the radius of chamfer, the formula for calculating the axial compression capacity of FRP- concrete-steel tube composite solid square short columns is derived. The theoretical calculation results are in good agreement with the experimental results, and the effects of the intermediate principal stress coefficient, lateral pressure coefficient, chamfer radius and ratio of diameter to thickness of steel pipe on axial compression capacity are analyzed. Considering the influence of the intermediate principal stress and the ratio of material tension and compression to the ultimate bearing capacity of the newly proposed square high strength concrete filled steel tube composite columns, the effective constraint coefficient and the non-effective constraint coefficient are introduced to consider the difference of the confinement effect of stirrups on concrete filled steel tube. The external stirrups confined concrete of steel tube is divided into effective confinement zone and non-effective confinement zone. The square section is equivalent to a circular section to consider the double confinement effect of the steel tube and the peripheral reinforced concrete subjected to the core concrete of the steel tube. A new method for calculating the ultimate bearing capacity of concrete filled square steel tube columns under axial compression is presented. The theoretical results are in good agreement with the experimental results, and the formula is proved to be correct. The analysis of the influence law of each parameter shows that the bearing capacity of square high strength concrete filled steel tube composite columns increases with the increase of lateral pressure coefficient, the influence coefficient of intermediate principal stress, the ratio of material tension to compression and the ratio of longitudinal reinforcement. With the increase of diameter to thickness ratio of steel pipe, it decreases. The numerical simulation of FRP- concrete-steel pipe composite solid square short column and composite column is carried out by using ANSYS software. The rationality of the numerical simulation is verified by comparing with the experimental value and the theoretical calculation value of the member. The numerical simulation is in good agreement with the theoretical calculation, which ensures the correctness of the obtained deformation diagram and stress field distribution diagram, and analyzes the mechanical characteristics, bearing capacity influence parameters and failure form of the member.
【学位授予单位】：长安大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TU398.9
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