鋼筋混凝土構架建築物於塩害環境下之耐震可靠度分析

Seismic Reliability Analysis of Reinforced Concrete Framed Buildings Attacked by Chloride

本研究目的主要以受塩害腐蝕之鋼筋混凝土構架建築物為對象提出一含鋼筋腐蝕影響之耐震性能評估方法，然而塩害所造成之鋼筋腐蝕過程充滿環境、 材料性質與施工誤差等之不確定性，本研究除上述之不確定性影響外，並將因鋼筋腐蝕造成材料性質改變而使梁柱構件之力學性能下降等現象納入耐震性能評估中，配合地震危度分析所得之譜加速度年超越機率而以耐震可靠度函數或安全機率表示目標建築物之耐震性能，對於工程之永續目標有極為重要意義。

The main purpose of this study is to propose an evaluation method that can be used for analyzing the time-dependent seismic reliability of RC buildings located in corrosive environments with high seismic hazard. In this study, several models have been developed to investigate the deterioration induced by chloride ingress in order to estimate the initiation stage and rate of corrosion and to analyze the structural capacity of columns and beams with corroded reinforcing bars; then, the seismic evaluation for RC framed buildings was used for calculating the story shear capacity of each floor in a building. In addition, the hazard curve of the story’s shear demand for each floor obtained from the seismic hazard analysis was adopted; consequently, a Monte Carlo simulation was carried out to estimate the annual failure probability and seismic reliability index of the building in question; in other words, a time-dependent seismic reliability function could be built.