In this study, the temporary structural system for a trenchless method was developed. The developed structural system is a type of hybrid member consisting of mortar-filled steel tubes laterally connected by headed reinforcements. This lateral connection gives this system not only longitudinal but also lateral stiffness. Experimental studies were carried out to evaluate the flexural strength of the developed hybrid structural system. Behaviors of each component of this structural system, such as wing plate, connection plate and headed reinforcement were also studied. Experimental results showed that the developed system had superb flexural strength. The wing plate and connection plate had a positive effect on the flexural strength. Based on the experimental results, a simple design equation to evaluate the flexural strength of the developed structural system was suggested and compared with experimental results.

中文翻译：

---

涵洞混合构件的抗弯强度，该涵洞由灰泥填充的钢管组成，这些钢管通过带头部的钢筋横向连接

在这项研究中，开发了一种非开挖方法的临时结构系统。发达的结构系统是一种混合构件，由由砂浆填充的钢管组成，该钢管由带头部的钢筋横向连接。这种横向连接不仅使该系统具有纵向刚度，而且还赋予了横向刚度。进行了实验研究，以评估已开发的混合结构系统的抗弯强度。还研究了该结构系统的每个组件的行为，例如翼板，连接板和带头钢筋。实验结果表明，该系统具有良好的抗弯强度。翼板和连接板对抗弯强度有积极影响。根据实验结果，