西安建筑科技大学学报(自然科学版)

双向叠合板的拼缝性能是保持其整体性的关键.根据整体式拼缝构造优点,文章对原密拼拼缝叠合板进行了一定的改进,并对采用马镫钢筋作为抗剪拉结钢筋的该种密拼叠合板拼缝变化前后的受力性能进行了试验研究.通过四块简支板的静力加载试验,对规范密拼拼缝形式下的叠合板、改进后密拼缝叠合板的荷载 - 挠度曲线、承载力、变形以及拼缝性能等进行了分析,并研究了其裂缝成因、拼缝处受力机理以及开裂荷载的计算.试验表明:规范分离式拼缝叠合板易产生沿着叠合面的撕裂破坏,其附加钢筋容易发生局部滑移或者锚固失效; 构件屈服荷载受附加钢筋的粘结滑移影响有一定的降低,其破坏形态接近两折线形; 改进后的拼拼缝叠合板其密拼钢筋的粘结滑移行为有较大改善,其屈服荷载基本达到其设计值,破坏形态以及变形曲线较原有密拼板丰满.

The joint performance of the two-way composite slab is the key to the maintenance of its integrity. In this paper, the original close jointed composite slab is improved by combining the advantages of integral jointed structure and the mechanical properties of this kind of composite slab with stirrup reinforcement as shear tie reinforcement before and after the change of joint are studied. Through static loading test of four simply supported plates, the load deflection curve, bearing capacity, deformation and joint performance of the original composite slab and the improved composite slab are analyzed, and the causes of the cracks, the stress mechanism at the joints and the calculation of the cracking load are studied. Test results show that the standard split joint composite plate is easy to tear along the composite plane, and its additional reinforcement is easy to slip or cause anchor failure. The yield load of the specimen is affected by the bond slip of the additional reinforcement, and its failure mode is close to two fold linear. The bond slip behavior of additional reinforcement of the improved slab is improved greatly; its yield load basically reaches its design value; and its failure deflection is fuller than that of the original slab.

引言
1 试验概况
2 试验结果及其分析
3 受力性能分析
4 结论

图1 试件YB1-4详图(单位:mm)<br/>Fig.1 Details of the YB1-YB4 specimens(unit: mm)

图1 试件YB1-4详图(单位:mm)
Fig.1 Details of the YB1-YB4 specimens(unit: mm)

图2 拼缝构造详图(单位:mm)<br/>Fig.2 Details of the joint(unit: mm)

图2 拼缝构造详图(单位:mm)
Fig.2 Details of the joint(unit: mm)

表1 材性力学性能<br/>Tab.1 Properties of material

表1 材性力学性能
Tab.1 Properties of material

图3 挠度测点布置图(单位:mm)<br/>Fig.3 Arrangement of deflection measuring points (unit: mm)

图3 挠度测点布置图(单位:mm)
Fig.3 Arrangement of deflection measuring points (unit: mm)

图4 应变测点布置图(单位:mm)<br/>Fig.4 Arrangement of strain gague points(unit: mm)

图4 应变测点布置图(单位:mm)
Fig.4 Arrangement of strain gague points(unit: mm)

图5 各试件荷载挠度与特征曲线<br/>Fig.5 Load versus displacement and characteristic curves

图5 各试件荷载挠度与特征曲线
Fig.5 Load versus displacement and characteristic curves

表2 各试件弯矩汇总<br/>Tab.2 Bending moment of the specimens

表2 各试件弯矩汇总
Tab.2 Bending moment of the specimens

图6 各拼缝板板侧破坏形态<br/>Fig.6 Failure patterns on side of specimens

图6 各拼缝板板侧破坏形态
Fig.6 Failure patterns on side of specimens

图7 板底拼缝宽度<br/>Fig.7 Crack width of joints at bottom specimens

图7 板底拼缝宽度
Fig.7 Crack width of joints at bottom specimens

图8 密拼钢筋及拼缝外部钢筋应变 - 挠度曲线<br/>Fig.8 Reinforcement strain vs. displacement curves

图8 密拼钢筋及拼缝外部钢筋应变 - 挠度曲线
Fig.8 Reinforcement strain vs. displacement curves

图9 钢筋各阶段应力分布<br/>Fig.9 Stress distribution of reinforcement in each stage

图9 钢筋各阶段应力分布
Fig.9 Stress distribution of reinforcement in each stage

图10 混凝土应变 - 挠度曲线<br/>Fig.10 Concrete strain vs. displacement curves

图10 混凝土应变 - 挠度曲线
Fig.10 Concrete strain vs. displacement curves

图11 试件挠曲变形曲线<br/>Fig.11 Deformation curves of the specimens

图11 试件挠曲变形曲线
Fig.11 Deformation curves of the specimens

图12 附加钢筋受力模型<br/>Fig.12 Stress model of additional reinforcement

图12 附加钢筋受力模型
Fig.12 Stress model of additional reinforcement

图13 钢筋受力图[15]<br/>Fig.13 Stress diagram of reinforcement

图13 钢筋受力图[15]
Fig.13 Stress diagram of reinforcement

图14 板水平裂缝受力简化图<br/>Fig.14 Simplified stress diagram of horizontal crack

图14 板水平裂缝受力简化图
Fig.14 Simplified stress diagram of horizontal crack

表3 横向裂缝开裂弯矩汇总表<br/>Tab.3 Cracking moment of horizontal crack

表3 横向裂缝开裂弯矩汇总表
Tab.3 Cracking moment of horizontal crack

图15 YB3破坏受力以及挠曲<br/>Fig.15 Failure diagram and deflection of YB3

图15 YB3破坏受力以及挠曲
Fig.15 Failure diagram and deflection of YB3

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备注

引言

1 试验概况

2 试验结果及其分析

3 受力性能分析

4 结论

期刊信息