At a global level, there is a vital need to reduce the demand on concrete, because this construction material harms the environment, mainly due to carbon dioxide emission and destroying the surrounding nature for the purpose of taking raw materials during Portland cement manufacturing. This study is an encouraging attempt to utilize the natural resources for the roof construction and diminish using of concrete. This study aimed at investigating the structural behavior and performance of composite concrete-unregularized timber beam. The system essentially consists of a relatively thin concrete section slab and populus nigra timber (PNT) joist. Essential tests on concrete and timber materials were conducted in the laboratory, in addition to five composite concrete-timber beams. Results show that there is a good chance to use the PNT joist for composite roof construction. The resulted composite section is well recognized by a high stiffness and high load carrying capacity. It was found that steel screw fasteners provided at 100 mm spacing is the best arrangement and can be safely used for connecting concrete to the unregularaized timber section. Further, there is a chance to use Eurocode 5 design proposal to check the stresses in both materials safely at serviceability and ultimate limit stages, because the PNT timber behaves elastically till failure without appreciable post ultimate response.

在全球范围内，迫切需要减少对混凝土的需求，因为这种建筑材料损害环境，这主要是由于二氧化碳的排放和破坏周围自然环境，目的是在波特兰水泥生产过程中获取原材料。这项研究是一项令人鼓舞的尝试，它利用自然资源进行屋顶施工并减少了混凝土的使用。这项研究旨在调查复合混凝土-非规则木梁的结构性能和性能。该系统主要由相对薄的混凝土板和黑杨（PNT）托梁组成。除了五个混凝土和木材复合梁外，还在实验室中对混凝土和木材进行了基本测试。结果表明，有很好的机会使用PNT托梁进行复合屋顶施工。高刚性和高承载能力很好地识别了所得的复合材料截面。发现以100 mm间距提供的钢制螺丝紧固件是最佳布置，可以安全地用于将混凝土连接到非规则木材部分。此外，有机会使用Eurocode 5设计建议书来在可维修性和极限极限阶段安全地检查两种材料中的应力，因为PNT木材的行为会弹性直至失效，而没有明显的后期极限响应。发现以100 mm间距提供的钢制螺丝紧固件是最佳布置，可以安全地用于将混凝土连接到非规则木材部分。此外，由于PNT木材会表现出弹性直至失效，而没有明显的后期极限响应，因此有机会使用Eurocode 5设计提案来安全地检查两种材料在使用性和极限极限阶段的应力。发现以100 mm的间距提供的钢制螺丝紧固件是最佳的布置，可以安全地用于将混凝土连接到不规则木材部分。此外，有机会使用Eurocode 5设计建议书来在可维修性和极限极限阶段安全地检查两种材料中的应力，因为PNT木材的行为会弹性直至失效，而没有明显的后期极限响应。