Some reinforced concrete slabs are subjected simultaneously to concentrated loads and unidirectional in‐plane tensile forces. This the case of the top slab of a box girder bridge where hogging bending moments take place at the intermediate supports. Then, the in‐plane tensile forces may reduce the punching‐shear strength under concentrated loads. This paper describes an experimental campaign carried out to investigate the effect of unidirectional in‐plane tensile forces on the punching‐shear strength of RC slabs. A total of, five slabs (1,650 × 1,650 × 120 mm), subjected to different levels of in‐plane tensile forces were tested under a concentrated load up to failure. As observed, the punching‐shear strength diminishes almost linearly as the tensile force increases, up to a certain point associated to concrete cracking. From that point on, the reduction of punching strength is larger since the tensile force at the crack must be resisted by the reinforcement, which yields prematurely.

中文翻译：

---

承受单向面内拉力的钢筋混凝土板冲切强度

一些钢筋混凝土板同时承受集中载荷和单向平面内拉力。箱形箱梁桥的顶部平板就是这种情况，其中在中间支撑处产生了弯矩弯矩。然后，面内拉力可能会降低集中载荷下的冲剪强度。本文描述了一项实验活动，旨在研究单向面内拉力对RC板冲切强度的影响。总共测试了五个平板（1,650×1,650×120 mm），这些平板承受了不同水平的平面内拉力，直至达到破坏的集中载荷。如观察到的，随着拉伸力的增加，冲剪强度几乎线性降低，直至与混凝土开裂相关的某个点。从那时起，