Although moment-resisting frames exhibit satisfactory ductile performance, they suffer from limitations such as low stiffness. Consequently, designers attempt to enhance stiffness by reducing the span length of these frames. Meanwhile, design codes impose a minimum limit on the span-to-depth ratio for moment-resisting frames. This provision ensures the adequate formation of flexural plastic hinges at both ends of the beam. In this paper, a novel energy-absorbing steel system is proposed through numerical studies. In this system, instead of the conventional method of locally reducing beam cross-sections at both ends, a non-prismatic reduction of the beam cross-section along its entire length is introduced. As a result, energy dissipation occurs over a larger portion of the beam, thereby overcoming the aforementioned code limitation. After validation, two conventional lateral load-resisting systems and one system based on the idea presented in this study are considered, and their performance is evaluated using the finite element method. the proposed moment-resisting frame in this study exhibits approximately 2.15 times higher stiffness, twice the strength, and twice the energy absorption capacity compared to a conventional moment-resisting frame with a span-to-depth ratio of 7, while maintaining nearly equivalent plastic strain (PEEQ). Furthermore, when compared to a conventional moment-resisting frame with a span-to-depth ratio of 4 (which violates code provisions), the proposed system demonstrates comparable stiffness, strength, and energy dissipation, yet its PEEQ is about 37% lower, underscoring the superiority of the proposed concept.