配螺旋箍筋方鋼管混凝土柱計算方法及試驗研究
發(fā)布時間：2019-05-07 05:10
【摘要】：方鋼管混凝土柱中鋼管邊中部對核心混凝土的約束較弱，使得方鋼管混凝土柱中核心混凝土的抗壓強度不能得到充分發(fā)揮。為了充分發(fā)揮方鋼管混凝土柱中核心混凝土抗壓強度和塑性變形能力，在方鋼管混凝土柱中配置螺旋箍筋來有效約束核心混凝土，從而提高方鋼管混凝土柱的承載力和塑性變形的能力。因此，本文通過試驗研究了方鋼管混凝土及配螺旋箍筋方鋼管混凝土柱的力學性能和破壞模式，及方鋼管混凝土及配螺旋箍筋方鋼管混凝土柱承載力的計算方法。 通過試驗研究結果表明：相對方鋼管混凝土柱而言，配螺旋箍筋方鋼管混凝土柱承載力有較大程度的提高，最大提高幅度為41％；由于螺旋箍筋對核心混凝土的約束作用使得配螺旋箍筋方鋼管混凝土柱的橫向應變小于方鋼管混凝土的橫向應變；配螺旋箍筋后使得方鋼管對核心混凝土的約束效應增強，配螺旋箍筋方鋼管混凝土柱的上部到下部截面橫向應變比方鋼管混凝土柱變化均勻；相對于增加螺旋箍筋直徑來說，，減小螺旋箍筋間距可更有效的增加配螺旋箍筋方鋼管混凝土柱的極限承載力和延性。 在鋼管混凝土柱計算方法中，疊加理論計算公式簡單明了，容易在實際工程中采用。但方鋼管對核心混凝土的約束效應對承載力的影響在疊加原理中并未得到體現(xiàn)。因此本文研究的計算理論主要以疊加理論為基礎，通過把方鋼管混凝土柱的核心混凝土分為有效約束區(qū)和非有效約束區(qū)，對有效約束區(qū)的核心混凝土采用有側向約束的強度，來考慮鋼管的約束效應對方鋼管混凝土柱承載力影響的計算方法，并將有效約束區(qū)、非有效約束區(qū)和方鋼管三部分的承載力相互疊加，推導出方鋼管混凝土短柱的承載力計算公式。 通過相同的方法將配螺旋箍筋的方鋼管混凝土柱的核心混凝土分為三部分：方鋼管和螺旋箍筋共同作用的有效約束區(qū)、單獨螺旋箍筋作用的有效約束區(qū)和非有效約束區(qū)，并將方鋼管和螺旋箍筋共同作用的有效約束區(qū)、單獨螺旋箍筋作用的有效約束區(qū)、非有效約束區(qū)和方鋼管四部分的承載力相互疊加，推導出配螺旋箍筋的方鋼管混凝土柱的承載力計算公式。 通過將方鋼管混凝土柱等效為圓鋼管混凝土柱，并將極限平衡理論首次應用在方鋼管混凝土柱的承載力計算中，按照上述方法把核心混凝土分為有效約束區(qū)和非有效約束區(qū)，通過鋼管的Von Mise屈服條件和方鋼管混凝土柱的承載力的平衡條件，推導得出方鋼管混凝土柱的理論計算公式。
[Abstract]:The compression strength of the core concrete in concrete filled square steel tube column can not be fully exerted because of the weak constraint on the core concrete in the middle edge of the concrete filled square steel tube column. In order to give full play to the compressive strength and plastic deformation capacity of core concrete in concrete filled square steel tube columns, spiral stirrups are arranged in concrete filled square steel tube columns to restrain the core concrete effectively. Therefore, the bearing capacity and plastic deformation ability of concrete filled square steel tube columns are improved. Therefore, the mechanical properties and failure modes of concrete-filled square steel tube (CFST) and concrete-filled square steel tube (CFST) columns with spiral hoop reinforcement, as well as the calculation methods of bearing capacity of CFST and CFST columns with spiral hoop reinforcement, are studied experimentally in this paper. The experimental results show that the bearing capacity of concrete-filled square steel tube columns with spiral hoop reinforcement is improved to a great extent, and the maximum increase is 41%. The transverse strain of concrete filled square steel tube column with spiral hoop reinforcement is smaller than that of concrete filled square steel tube due to the constraint of spiral stirrups on the core concrete. When reinforced with spiral stirrups, the restraint effect of concrete filled square steel tubes on the core concrete is enhanced, and the transverse strain of concrete filled square steel tube columns with spiral hoop reinforcement, such as the lateral strain of the concrete filled steel tube columns, varies evenly from the upper to the lower section. Compared with increasing the diameter of spiral stirrups, decreasing the spacing of spiral stirrups can increase the ultimate bearing capacity and ductility of concrete-filled square steel tube columns with spiral stirrups more effectively. In the calculation method of concrete filled steel tube column, the calculation formula of superposition theory is simple and clear, and it is easy to use in practical engineering. However, the influence of the restraint effect of square steel tube on the bearing capacity of core concrete is not reflected in the superposition principle. Therefore, based on the superposition theory, the core concrete of concrete filled square steel tube column is divided into effective constraint zone and non-effective constraint zone, and the strength of the core concrete with lateral constraint is adopted for the effective constraint zone. Considering the constraint effect of steel tube to the bearing capacity of concrete-filled steel tube column, the bearing capacity of three parts, namely effective restricted zone, non-effective confined zone and square steel tube, is superimposed on each other. A formula for calculating the bearing capacity of concrete filled square steel tubular short columns is derived. In the same way, the core concrete of concrete filled square steel tube columns with spiral stirrups is divided into three parts: the effective binding zone of square steel tube and spiral stirrups, the effective binding zone of single spiral stirrups, and the non effective confinement zone of the concrete filled square steel tube columns with spiral stirrups. The effective restraint zone of square steel pipe and spiral stirrups, the effective restricted zone of single spiral stirrups, the non-effective restricted zone and the bearing capacity of square steel pipes are superimposed on each other. A formula for calculating the bearing capacity of concrete-filled square steel tube columns with spiral stirrups is derived. The concrete filled square steel tube column is equivalent to the circular concrete filled steel tube column, and the limit equilibrium theory is applied to the calculation of the bearing capacity of the square concrete filled steel tube column for the first time. According to the above method, the core concrete is divided into effective constraint zone and non effective constraint zone. Based on the Von Mise yield condition of steel tube and the equilibrium condition of bearing capacity of concrete filled square steel tube column, the theoretical calculation formula of concrete filled square steel tube column is derived.
【學位授予單位】：天津大學
【學位級別】：博士
【學位授予年份】：2013
【分類號】：TU398.9
本文編號：2470799
[Abstract]:The compression strength of the core concrete in concrete filled square steel tube column can not be fully exerted because of the weak constraint on the core concrete in the middle edge of the concrete filled square steel tube column. In order to give full play to the compressive strength and plastic deformation capacity of core concrete in concrete filled square steel tube columns, spiral stirrups are arranged in concrete filled square steel tube columns to restrain the core concrete effectively. Therefore, the bearing capacity and plastic deformation ability of concrete filled square steel tube columns are improved. Therefore, the mechanical properties and failure modes of concrete-filled square steel tube (CFST) and concrete-filled square steel tube (CFST) columns with spiral hoop reinforcement, as well as the calculation methods of bearing capacity of CFST and CFST columns with spiral hoop reinforcement, are studied experimentally in this paper. The experimental results show that the bearing capacity of concrete-filled square steel tube columns with spiral hoop reinforcement is improved to a great extent, and the maximum increase is 41%. The transverse strain of concrete filled square steel tube column with spiral hoop reinforcement is smaller than that of concrete filled square steel tube due to the constraint of spiral stirrups on the core concrete. When reinforced with spiral stirrups, the restraint effect of concrete filled square steel tubes on the core concrete is enhanced, and the transverse strain of concrete filled square steel tube columns with spiral hoop reinforcement, such as the lateral strain of the concrete filled steel tube columns, varies evenly from the upper to the lower section. Compared with increasing the diameter of spiral stirrups, decreasing the spacing of spiral stirrups can increase the ultimate bearing capacity and ductility of concrete-filled square steel tube columns with spiral stirrups more effectively. In the calculation method of concrete filled steel tube column, the calculation formula of superposition theory is simple and clear, and it is easy to use in practical engineering. However, the influence of the restraint effect of square steel tube on the bearing capacity of core concrete is not reflected in the superposition principle. Therefore, based on the superposition theory, the core concrete of concrete filled square steel tube column is divided into effective constraint zone and non-effective constraint zone, and the strength of the core concrete with lateral constraint is adopted for the effective constraint zone. Considering the constraint effect of steel tube to the bearing capacity of concrete-filled steel tube column, the bearing capacity of three parts, namely effective restricted zone, non-effective confined zone and square steel tube, is superimposed on each other. A formula for calculating the bearing capacity of concrete filled square steel tubular short columns is derived. In the same way, the core concrete of concrete filled square steel tube columns with spiral stirrups is divided into three parts: the effective binding zone of square steel tube and spiral stirrups, the effective binding zone of single spiral stirrups, and the non effective confinement zone of the concrete filled square steel tube columns with spiral stirrups. The effective restraint zone of square steel pipe and spiral stirrups, the effective restricted zone of single spiral stirrups, the non-effective restricted zone and the bearing capacity of square steel pipes are superimposed on each other. A formula for calculating the bearing capacity of concrete-filled square steel tube columns with spiral stirrups is derived. The concrete filled square steel tube column is equivalent to the circular concrete filled steel tube column, and the limit equilibrium theory is applied to the calculation of the bearing capacity of the square concrete filled steel tube column for the first time. According to the above method, the core concrete is divided into effective constraint zone and non effective constraint zone. Based on the Von Mise yield condition of steel tube and the equilibrium condition of bearing capacity of concrete filled square steel tube column, the theoretical calculation formula of concrete filled square steel tube column is derived.
【學位授予單位】：天津大學
【學位級別】：博士
【學位授予年份】：2013
【分類號】：TU398.9
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