新型外包钢—混凝土组合连续梁及梁柱节点的试验研究
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摘要
外包钢-混凝土组合梁是在钢-混凝土组合梁的基础上发展起来的一种新型组合梁,具有用钢量省、稳定性好、刚度大、承载力高等优点,对其进行研究具有重要的理论意义和实用价值。本文通过模型试验和理论分析对外包钢-混凝土组合连续梁以及外包钢-混凝土组合梁与柱连接节点的受力性能进行了研究。完成的主要工作和取得的成果包括:
(1)对两根外包钢-混凝土组合简支梁和两根外包钢-混凝土组合连续梁进行了静力试验研究。试验表明,外包钢-混凝土组合梁负弯矩区钢筋和外包钢梁通过抗剪连接措施能有效地共同工作;U形钢梁截面内混凝土的填充,使外包钢梁的整体和局部稳定性增强,在承载能力极限状态,负弯矩及正弯矩最大截面的塑性应变均充分发展,并形成比较理想的塑性铰。
(2)对负弯矩作用下外包钢-混凝土组合梁的极限受弯承载力、极限受剪承载力、弯剪相关性以及组合梁混凝土翼板与腹板交界面处的纵向受剪切等性能进行了理论分析并提出了相应的计算方法,计算结果和试验结果吻合良好;对连续组合梁的内力重分布现象和中支座的弯矩调幅系数进行了探讨。
(3)对负弯矩作用下外包钢-混凝土组合梁混凝土翼缘板的开裂弯矩、裂缝最大宽度和挠度进行了分析,提出的计算方法能较好地反映外包钢-混凝土连续组合梁在正常使用状态下的变形性能。
(4)对四个外包钢-混凝土组合梁与钢筋混凝土柱的连接节点和四个外包钢-混凝土组合梁与型钢混凝土柱的连接节点进行了低周反复荷载试验研究。试验表明,通过合理的构造措施,外包钢-混凝土组合梁与钢筋混凝土柱、型钢混凝土柱的连接节点具有较强的受剪承载力、较好的延性和耗能能力,能够满足工程要求。
(5)对节点的受力机理进行了探讨,提出了节点核心区受剪承载力的计算公式,并对节点的构造形式和构造措施给出了设计建议。
The outer-plated steel-concrete composite beam is a new type of composite beam, which evolved from the steel-concrete composite beam, and possesses favorable long-term potential by having the merits of steel-saving, good stability, large stiffness and high load-bearing capacity. The study on the outer-plated steel-concrete composite beam is therefore important in both theory and application. Based on the model test and theoretical analysis, this research investigates the load-bearing performance of both the outer-plated steel-concrete continuous composite beam and the joint connecting beam and column. The accomplished primary works and obtained achievements include:
(1) The static load tests were conducted for two simply supported outer-plated steel-concrete composite beams and two outer-plated steel-concrete continuous composite beams. Test results indicate that effective cooperation can be achieved by the shear-resistant connection between the reinforcement in the negative moment area and the outer-plated steel beam. The concrete filling inside the cross section of U-shaped steel beam enhances the entire and local stability of the outer-plated steel beam. In the load-bearing limiting state, the plastic strain on sections of both the negative maximum moment and the positive one develops fully so that relatively ideal plastic hinges are formed.
(2) Theoretical analyses are made and also the corresponding computation methods are proposed for the ultimate bending capacity, ultimate shearing capacity and correlation between bending and shearing of outer-plated steel-concrete composite beam, as well as the longitudinal shear-resistant performance on the interface between flange plate and web plate. The computational solutions correlate well with test results. The redistribution of internal force and the moment modulation factor of inner supports are studied for the continuous composite beam.
(3) The cracking moment of concrete flange, the maximum crack width and deflection are analyzed for the outer-plated steel-concrete composite beam under the action of negative bending moment. The suggested method of calculation provides a good imitation of deformation performance for the outer-plated steel-concrete continuous composite beam in normal service state.
(4) The low-cycle repeated load tests were conducted for four joints connecting the outer-plated steel-concrete composite beam and reinforced concrete column, and another four joints connecting the outer-plated steel-concrete composite beam and shaped-steel concrete column. Tests indicate that significant shear-resistant capacity and satisfying ductility and energy dissipation ability can be obtained by appropriate constructional measure so as to satisfy the engineering requirement.
(5) The force mechanism of joint is investigated and the formula for calculating the shear capacity of core area of joint is presented. Some design suggestions are also given for the constructional form and measure of joint.
(1)对两根外包钢-混凝土组合简支梁和两根外包钢-混凝土组合连续梁进行了静力试验研究。试验表明,外包钢-混凝土组合梁负弯矩区钢筋和外包钢梁通过抗剪连接措施能有效地共同工作;U形钢梁截面内混凝土的填充,使外包钢梁的整体和局部稳定性增强,在承载能力极限状态,负弯矩及正弯矩最大截面的塑性应变均充分发展,并形成比较理想的塑性铰。
(2)对负弯矩作用下外包钢-混凝土组合梁的极限受弯承载力、极限受剪承载力、弯剪相关性以及组合梁混凝土翼板与腹板交界面处的纵向受剪切等性能进行了理论分析并提出了相应的计算方法,计算结果和试验结果吻合良好;对连续组合梁的内力重分布现象和中支座的弯矩调幅系数进行了探讨。
(3)对负弯矩作用下外包钢-混凝土组合梁混凝土翼缘板的开裂弯矩、裂缝最大宽度和挠度进行了分析,提出的计算方法能较好地反映外包钢-混凝土连续组合梁在正常使用状态下的变形性能。
(4)对四个外包钢-混凝土组合梁与钢筋混凝土柱的连接节点和四个外包钢-混凝土组合梁与型钢混凝土柱的连接节点进行了低周反复荷载试验研究。试验表明,通过合理的构造措施,外包钢-混凝土组合梁与钢筋混凝土柱、型钢混凝土柱的连接节点具有较强的受剪承载力、较好的延性和耗能能力,能够满足工程要求。
(5)对节点的受力机理进行了探讨,提出了节点核心区受剪承载力的计算公式,并对节点的构造形式和构造措施给出了设计建议。
The outer-plated steel-concrete composite beam is a new type of composite beam, which evolved from the steel-concrete composite beam, and possesses favorable long-term potential by having the merits of steel-saving, good stability, large stiffness and high load-bearing capacity. The study on the outer-plated steel-concrete composite beam is therefore important in both theory and application. Based on the model test and theoretical analysis, this research investigates the load-bearing performance of both the outer-plated steel-concrete continuous composite beam and the joint connecting beam and column. The accomplished primary works and obtained achievements include:
(1) The static load tests were conducted for two simply supported outer-plated steel-concrete composite beams and two outer-plated steel-concrete continuous composite beams. Test results indicate that effective cooperation can be achieved by the shear-resistant connection between the reinforcement in the negative moment area and the outer-plated steel beam. The concrete filling inside the cross section of U-shaped steel beam enhances the entire and local stability of the outer-plated steel beam. In the load-bearing limiting state, the plastic strain on sections of both the negative maximum moment and the positive one develops fully so that relatively ideal plastic hinges are formed.
(2) Theoretical analyses are made and also the corresponding computation methods are proposed for the ultimate bending capacity, ultimate shearing capacity and correlation between bending and shearing of outer-plated steel-concrete composite beam, as well as the longitudinal shear-resistant performance on the interface between flange plate and web plate. The computational solutions correlate well with test results. The redistribution of internal force and the moment modulation factor of inner supports are studied for the continuous composite beam.
(3) The cracking moment of concrete flange, the maximum crack width and deflection are analyzed for the outer-plated steel-concrete composite beam under the action of negative bending moment. The suggested method of calculation provides a good imitation of deformation performance for the outer-plated steel-concrete continuous composite beam in normal service state.
(4) The low-cycle repeated load tests were conducted for four joints connecting the outer-plated steel-concrete composite beam and reinforced concrete column, and another four joints connecting the outer-plated steel-concrete composite beam and shaped-steel concrete column. Tests indicate that significant shear-resistant capacity and satisfying ductility and energy dissipation ability can be obtained by appropriate constructional measure so as to satisfy the engineering requirement.
(5) The force mechanism of joint is investigated and the formula for calculating the shear capacity of core area of joint is presented. Some design suggestions are also given for the constructional form and measure of joint.
引文
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