Concrete composite slab system with pre-cast bottom segment and cast-in-situ top segment is gaining importance due to wide-ranging applications in buildings, bridges and industrial flooring, etc. These slabs may also be subjected to repeated loading during its service life and hence, it is essential to evaluate their static and fatigue behaviour under flexural loading. In present study, at first, experimental investigations are conducted to evaluate the performance of composite slabs with truss type shear connectors with two orientation angles, namely, 45° and 60°. The composite slab specimens are subjected to four-point bending. The load-versus-displacement responses obtained for the composite slabs are compared with that of control full slab. It is observed that the composite slab with 45° shear connector showed better performance when compared to composite slab with 60° shear connector in terms of load-displacement response, rotation, ductility and energy absorption and also found to be efficient in terms of area of steel crossing the interface. Further, numerical investigations are also carried out to assess load transfer mechanism of truss type shear connectors at different significant events. The force flow mechanism of truss type shear connectors is brought out clearly. From the numerical investigations on composite slabs with different orientation angles, it is observed that composite slab with 45° shear connector exhibited superior performance over other orientation angles in terms of better force flow mechanism and lesser area of steel crossing the interface. Further, fatigue performance of composite slab with 45° shear connector is evaluated and compared with the fatigue performance of control slab. It could be observed that the composite slab with 45° truss type shear connector showed better fatigue performance when compared to the control slab.

由于在建筑物、桥梁和工业地板等领域的广泛应用，具有预制底段和现浇顶段的混凝土复合板系统越来越重要。这些板在其使用寿命期间也可能受到反复加载因此，必须评估它们在弯曲载荷下的静态和疲劳行为。在目前的研究中，首先进行了实验研究，以评估具有两个取向角（即 45°和 60°）的桁架式剪力连接件的复合板的性能。复合板试件进行四点弯曲。将复合板获得的载荷-位移响应与对照全板的响应进行比较。据观察，与具有 60° 剪切连接器的复合板相比，具有 45° 剪切连接器的复合板在载荷位移响应、旋转、延展性和能量吸收方面表现出更好的性能，并且在面积方面也发现是有效的。钢穿过界面。此外，还进行了数值研究，以评估桁架式剪力连接件在不同重要事件下的载荷传递机制。明确了桁架式剪力连接件的力流机理。通过对不同取向角复合板的数值研究，观察到具有 45°剪切连接件的复合板在更好的力流机制和更小的钢穿过界面的面积方面表现出优于其他取向角的性能。更多，评估了具有45°剪切连接件的复合板的疲劳性能，并与控制板的疲劳性能进行了比较。可以观察到，与对照板相比，具有 45°桁架式剪切连接件的复合板显示出更好的疲劳性能。