@inproceedings{bib_Seis_2025, AUTHOR = {Shubham Singhal, Ajay Chourasia}, TITLE = {Seismic design parameters for precast reinforced concrete structural elements with different joint connection systems under in-plane lateral loading}, BOOKTITLE = {Asian Journal of Civil Engineering.}. YEAR = {2025}}

The robustness of precast concrete structures is primarily governed by connections between the precast structural components. Joint connections deliver a vital role in load transfer, restraining movement, and providing stability at local and global level. This calls for appropriate connection mechanism for precast elements providing integrity under different loading conditions and ease of construction. The connection details in literature or available in practice have been rarely evaluated. This paper discusses the numerical modelling of precast reinforced concrete structural wall-column with different joint connection systems and evaluates various seismic design parameters, simulated through in-plane lateral loading in a finite element software. The connection systems evaluated are reinforcement bar connection, headed bar connections, U-bar connection and steel wire loop connection, which are subsequently compared with a cast-in-situ reinforced concrete wall-column model having similar material and geometrical properties. The seismic behaviour of connections have been studied with regards to the damage pattern, stresses, lateral load capacity, base shear coefficient, stiffness, deformation characteristics, strength factors, and damage index. Among all the connection systems, U-bar connection and loop connection using steel wire ropes showed stresses within the yield limit, while other connection systems reached their yield capacity, indicating damage. Apparently, steel wire loop connection is found to be effective in transfer of lateral load between the precast reinforced concrete elements, as observed from the numerical analysis; whereas other connection systems yielded prior to the design load. However, all connections except the reinforcement bar connection surpassed design load prior to the peak limit.

@inproceedings{bib_Dama_2025, AUTHOR = {Ajay Chourasia, Shubham Singhal}, TITLE = {Damage Assessment and Structural Behavior Factor for Precast Reinforced Concrete Structural Systems}, BOOKTITLE = {World Conference on Earthquake Engineering}. YEAR = {2025}}

Design codes and standards provide a range of values for structural behavior factor for precast reinforced concrete (RC) structural systems. However, most of the codes give common value for all kinds of precast RC structural systems, due to the lack of information from experimental studies. Thus, the present paper highlights experimental investigation on behavior of different precast RC structural systems through quasi-static reversed cyclic tests on precast RC systems subjected to displacement-controlled loading. Different precast RC structural systems tested are precast RC wall-column system, precast RC double leaf system and precast RC beam-column joints with different configurations. Damage assessment has been carried out through observations and data obtained from the experiments, which has been co-related with the grade of damage, damage index and deformation capacity. Consequently, structural behavior factor for different precast RC structural systems has been determined. The structural behavior factor thus obtained would be beneficial for practising engineers and structural designers for analysis and design of different precast RC structural systems.