Maintenance on a Single Building:
- Impact: Likely limited to the occupants and daily operations within that building.
- System Reaction: The rest of the system (other buildings, Road, Railway) would generally remain unaffected. Residential building, office building and community building replacement maintenance would likely close each building as the maintenance is structural
- Serviceability: Moderate impact on overall serviceability; other buildings and transport routes remain fully operational.
Maintenance on the Road:
- Impact: This would have a significant effect since all buildings rely on the Road for access.
- System Reaction: Deck replacement would block access to the buildings, which might necessitate rerouting or could even temporarily isolate the residential building and the office building as they only have one road access. If the Road is completely closed, the Railway might also be affected if it relies on road-based logistical support.
- Serviceability: High impact on buildings and rail. Very high impact on residential and office buildings. Consideration for staggered or night-time maintenance could mitigate this.
Maintenance on the Railway:
- Impact: The primary impact would be on transport and logistics, particularly if the Railway serves as a major route for goods and commuters.
- System Reaction: The Road would likely experience increased traffic as an alternative mode of transport. The railway maintenance will require access from the road.
- Serviceability: If the Road can handle the extra traffic without congestion, the impact may be moderate; otherwise, it could lead to significant delays.
Simultaneous Maintenance on Multiple Buildings:
- Impact: Could disrupt operations for a larger number of people and operations if the buildings serve different purposes (e.g., residential vs. commercial).
- System Reaction: The need for coordinated schedules becomes critical to minimize downtime. Potential for increased demand on the Road if people need to relocate or find alternative offices/residences.
- Serviceability: No serious service hazards.
Simultaneous Maintenance on Road and Railway:
- Impact: This would be the most severe scenario, potentially paralyzing transport and access.
- System Reaction: The system does not cope well without significant pre-planning. Emergency services, deliveries, and daily commuting will be severely impacted.
- Serviceability: Will lead to system-wide serviceability failure if not managed with alternative solutions like temporary access routes, adjusted schedules, and prior notifications.
Baseline Schedule
Strategies
Preventive Maintenance:
Previous experience has demonstrated that conducting maintenance tasks proactively can prolong the lifespan of components and postpone the requirement for more extensive, and potentially disruptive, repairs. Consequently, the frequency of inspections has been increased to ensure early detection of issues. This proactive approach is expected to reduce the frequency of major replacements, leading to decreased downtime. If the road replacement is postponed the overall disrupting effect onto the whole system is also reduced.
Combining Some Systems Maintenance to Reduce Downtime:
Scheduling time intense maintenance works like multistory building and rail replacements together leads to overlap which reduces downtime, without disrupting access to other systems. Therefore, Multi Story building’s replacement will be scheduled 5 years earlier. Rail Replacement one year later. The other systems are scheduled the same as in the baseline schedule.
Automation:
Exploring automated scenarios by scheduling infrastructure and building maintenance together. The focus is on those critical components with the shortest service life and highest failure rates – for buildings, it’s the multipurpose building with a 50-year lifespan, and for infrastructure, it’s roads, with an 18-year lifespan. This strategy would most likely require the most coordination and rerouting. It would also have a temporary impact on the social life of residents and workers.
Ranges for intervention scenarios:
Buildings
- 3 <= INSP <= 7
- 7 <= RPR <= 11
- 21 <= RPT <= 25
Infrastructure
- 1 <= INSP <= 5
- 6 <= RPR <= 10
- 12 <= RPT <= 16
Total downtime 80 or 76.
The results show that applying different maintenance strategies reduces the total downtime of the systems. The automated process provided the best results, where;
