Jianren Zhang

Title: Innovations of Jianren Zhang in Concrete Bridge Engineering

Introduction

Jianren Zhang is a notable inventor based in Hunan, China, recognized for his contributions to the field of civil engineering, particularly in the area of prestressed concrete bridges. With a total of three patents to his name, Zhang has developed innovative methods and systems that enhance the durability and safety of concrete structures.

Latest Patents

One of Zhang's latest patents is titled "Method and system for predicting corrosion fatigue life of prestressed concrete bridges." This invention discloses a comprehensive method for predicting the corrosion fatigue life of prestressed concrete bridges. It involves predicting the corrosion level of the strand to obtain the residual tension force of the structure. The invention integrates a stress concentration factor to account for the effects of pitting corrosion and proposes a growth model for the elastic stress of the strand under the combined effects of corrosion and fatigue. Additionally, it establishes a growth model for the plastic stress of the strand, using cross-section loss as a fatigue damage parameter based on the degenerated elastic modulus of the concrete after fatigue. The patent defines failure criteria for the concrete, the strand, and a longitudinal tension bar, forming a set of methods for analyzing the life of a prestressed concrete bridge subjected to corrosive environments and fatigue loads.

Another significant patent by Zhang is the "Prestressed Bailey beam for reinforcement and construction method therefor." This invention describes a Bailey beam composed of prefabricated components, including Bailey panels, stiffening rods, bolts, anchor bolts, a prestressing tendon, and anchorages. The design allows for the assembly and hoisting of the beam on-site, with the prestressing tendon arranged in the lower chord of the beam. During prestress tensioning, the Bailey beam slides towards both ends, lifting as a whole and applying prestressing force to the lower edge, resulting in an inverted arch structure that closes cracks and reduces downward deflection. After prestress tensioning, sealing is performed by fixing fillers, a sealing steel plate, and injecting solidifiable materials.

Career Highlights

Zhang is affiliated with Changsha University of Science and Technology, where he continues to contribute to research and development in civil engineering. His work focuses on enhancing the performance and longevity of concrete structures, particularly in challenging environments.

Collaborations

Zhang collaborates with esteemed colleagues, including Lei Wang and Yafei Ma, who share his