Seismic Performance Assessment of Reinforced Concrete Frame-Shear Wall Structures in Hydropower Plants Based on Material Damage

Changzheng Shi,Qi-Ling Zhang,He-Gao Wu,Kai Su,Lei Hu

doi:10.1155/2020/6198594

Changzheng Shi, Qi-Ling Zhang + Show 3 more

Open Access

https://doi.org/10.1155/2020/6198594

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Abstract

For the reinforced concrete frame-shear wall (RCF-SW) structures in hydropower plants (HPs), the tensile cracking and compressive crushing of the reinforced concrete (RC) members are considered as the main potential damage. This paper presents a methodology to assess the seismic performance of RCF-SW structures. In this methodology, a concrete damage plasticity model is employed to simulate the reinforced concrete, and the structural seismic responses are investigated through nonlinear incremental dynamic analysis (IDA). Several engineering demand parameters (EDPs) based on the material damage are proposed to identify the structural engineering limit states and damage states at the member level. The case of x HP is provided as an example to illustrate the methodology and discuss the probable nonlinear response and structural damage state. The concrete damage evolution, reinforcement stresses, and drift ratios of the RCF-SW structure are presented, and the engineering limit states and structural damage states are identified. In comparison with the drift ratio index, the EDPs based on material damage are more suitable for identifying the damage state of the RCF-SW structure, whose damage is controlled by the damage of the RC members.

Highlights

In recent years, performance-based seismic design (PBSD) has emerged as one of the most important advances in seismic engineering [1,2,3]
Several engineering demand parameters (EDPs) based on material damage are proposed to track the damage extent to the structure. ese EDPs associated with the mean incremental dynamic analysis (IDA) curves are suggested to identify the engineering limit states and damage levels of reinforced concrete frame-shear wall (RCF-SW) structures at the member level
The RCFSW structure incurred the cracking of the columns and walls and the crushing of the columns. e EDPs based on material damage revealed the material damage evolution of the reinforced concrete (RC) members and distinguished the engineering limit states, such as cracking, crushing, reinforcement yielding, and plastic hinge forming. ese engineering limit states were used to identify the damage state of the RC members. erefore, a relationship between the EDPs and damage states was established

Summary

Introduction

Performance-based seismic design (PBSD) has emerged as one of the most important advances in seismic engineering [1,2,3]. E performance levels describe the structural damage states and consequential losses which may be incurred in terms of casualties, property, and operational capacity [4,5,6]. Erefore, in recent years, various EDPs and DMs based on the material damage have been proposed [41,42,43] Most of these DMs consider the damage of the most critical fibers of concrete and reinforcement as representative damage for each section, and the structural damage indices are typically defined as the function of the maximum material damage values of concrete and reinforcement. Several EDPs based on material damage have been proposed to predict the structural damage states of the RCF-SW at the member level. The structural damage states have been assessed by the EDPs

Nonlinear FEA

Results and Discussion

Conclusions