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This paper proposed a new lateral joint to connect precast concrete hollow‐core slabs (PCHSs) and increase their structural assembly efficiency. The main sensitive parameters are the longitudinal ribs and the number of proposed joints. Out‐of‐plane bending performance tests were conducted on four PCHSs with lateral joints (PCHS‐LJs) to study the effects of the main sensitive parameters on the mechanical properties and failure modes of the PCHS‐LJs. The test results showed that there is no obvious relative slip in the joints between the precast bottom slab and the upper post‐pouring concrete before PCHS‐LJs reaching the ultimate load. The transverse directions of PCHS‐LJs are the main force bearing directions and the cracks are mainly occurred in the longitudinal direction of the specimens, which is similar to the stress characteristics of one‐way slabs. Moreover, the vertical bearing capacities of PCHS‐LJs are increased when decreasing the number of proposed joints or when adding the longitudinal ribs. For the specimens without the longitudinal ribs, a wide transverse crack appears near the first transverse ribs, whereas the specimens with the longitudinal ribs do not exhibit this phenomenon. Thus, longitudinal ribs should be added to optimize the PCHS‐LJ failure modes. Finally, solid finite element (FE) models of the test specimens were established in MSC. MARC. The analysis results are basically consistent with the experimental results. [ABSTRACT FROM AUTHOR]

• Flexural performance of CWFBs with CHCSs was verified by out-of-plane flexural tests. • The CWFBs with CHCSs had shear lag effects in both the tension and compression zones. • The effect of loading method and slab width on CWFB effective width was analyzed. • The equation to calculate the effective width of the CWFB was deduced theoretically. To investigate the flexural performance and effective flange width of composite wide flat beams (CWFBs) with composite hollow core slabs (CHCSs), four CWFB specimens with double-sided CHCSs were tested and analyzed. The test results indicated that all specimens showed typical flexural damage. The CWFB with CHCSs had shear lag effect in both tension and compression zones. Increasing the width of the CHCSs resulted in a greater effective width, stiffness, and load carrying capacity of CWFB with CHCSs. Compared with the three-point loading method, the effective width of CWFB with CHCSs was larger for the four-point loading method and the uniform loading method. In addition, finite element models (FEMs) of the tested specimens in MSC. Marc software were validated by the test results, and 30 FEMs were further analyzed. Finally, the equations for calculating the effective width were obtained for the CWFB with CHCSs under uniform, four-point and three-point loads. [ABSTRACT FROM AUTHOR]