—Notation, p. —Definitions, p. ACI M supersedes ACI 12 (provisional), was adopted February 20,. , and was published May ACI August Code Requirements for Evaluation, Repair, and Rehabilitation of Concrete Buildings (an ACI Provisional Standard). ACI – Development of a Building Code for Repair of. Existing Concrete Structures. Keith Kesner, Senior Associate. Whitlock Dalrymple Poston & Associates.
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ACI Committee 562
Skip to main content. Log In Sign Up. Structural Audit of Buildings. International Journal of Civil Engineering Research. Abstract This paper deals to create awareness amongst the civil engineers, residents and owners of building towards the health examination of existing concrete buildings called as Structural Audit. The need of structural audit is for maintenance and repairs of existing structures whose life has exceeded the age of 30 years to avoid any mishaps and save valuable human life.
The concrete is widely used as construction material being inexpensive, easy for construction, applications and because of it high strength-cost ratio.
More than ever, the construction industry is concerned with improving the social, economic and environmental parameters of sustainability.
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In India, from onwards the infrastructure industry witnessed stepping up of public investment and growth in infrastructure industry which results in construction of new multistory concrete apartments which are now in the age of thirty plus years. There are many buildings during this period and earlier have reduced strength in due course of time because axi structural deficiency, material deterioration, unexpected over loadings or physical damage.
If, further use of such deteriorated structure is continued it may endanger the lives of occupants and surrounding habitation. There is demand of appropriate actions and measures for all such building structures to improve its performance and restore the desired functions of structures which may leads to increase its functional life.
Acl periodical structural auditing and diagnosis for health of existing buildings is thus utmost important for finding the present serviceability and structural viability of structures. The structural audit must be carried out following auditing norms, methods of non-destructive testing and code provisions. Jaiswal auditing will help to implement maintenance and repair work timely which leads to prolonged life of the building and safety of the occupants.
Introduction In India there are many old buildings which have reduced strength in due course of time. If further use of such deteriorated structure is continued it may endanger the lives of the occupants and surrounding habitation.
Appropriate actions should then be 562-21 to improve the performance of structures and restore the desired function of structures. To act more responsible and preemptive towards the dilapidated buildings, the municipal corporation must issue notices to the buildings and co-operative societies which are more than 30 years old to carry out mandatory structural audit and submit the audit report.
Structural audit should highlight and investigate all critical areas and recommend immediate remedial and preventive measures.
It should cover the structural analysis of existing frame and find critical elements for all types of loadings. It also helps in delivering a strong building structure with cost effective solutions and appropriate maintenance program.
This paper deals with study of different parameter of structural audit including visual inspection, non-destructive testing, core sampling and testing. It also emphasizes on different repairs and retrofitting measures to be used for buildings after structural audit.
Structural Audit is an overall health and performance checkup of a building like a doctor examines a patient. It ensures that the building and its premises are safe and have no risk. It analyses and suggests appropriate repairs and retrofitting measures required for the buildings to perform better in its service life.
Structural audit is done by an experienced and licensed structural consultant.
Stages in Carrying Out Structural Audit 3. A number of non-destructive tests NDT for concrete members are available to determine present strength and quality ack concrete. Some of these tests are very useful in assessment of damage to RCC structures subjected to corrosion, chemical attack, fire and due to other reasons. These tests have been put under four categories depending on the purpose of test as under: To measure surface hardness of concrete 3.
To measure strength, permeability, density of strength of concrete qualitatively, to determine structural integrity concrete. To assess depth of carbonation and pH of concrete 3. To measure cover of reinforcement, diameter of reinforcement 3. In this method cylindrical core samples are taken from existing structures.
The cores are visually inspected and tested in laboratory to check its compressive strength. The seismic evaluation of existing buildings compares their capacity against earthquake demand at specific site and concerns the potential earthquake-caused risk to building systems and elements that are closely related to human life safety. Post Structural Audit 4. According to ACI R, to repair is to replace or correct deteriorated, damaged, or faulty materials, components, or elements of a structural system.
From this point of view, repair may be divided into structural repair and serviceability repair. The former refers to the restoration of lost sectional or monolithic properties of damaged members, while the later refers to the restoration of structural surfaces to a satisfactory operational standard.
Structural Audit of Buildings | Krishna Jaiswal –
Strengthening of structural members can be achieved by replacing poor quality or defective material with better quality material, by attaching additional load-bearing material, such as high quality concrete, additional steel, thin steel plates, various types of fiber reinforced polymer sheets, and so on, and by the redistribution of acl load such as by adding a steel supporting 562-21.
The purpose of strengthening is to increase the load-carrying capacity or 562–12 of a structure with respect to its previous condition. Conclusion The structural diagnosis is vast, important and highly responsible job which is connected with lives of human beings. It is mandatory and advisable to carry out the periodical structural audit of the buildings by professional experts and act immediately through recommendations provided in audit report.
The success of repairs and restoration is always based on thorough knowledge, correct diagnosis and in-depth studies of problems in building, proper repair practices and finally socio-economic considerations. The effective implementation of auditing enhances the life span of structure, prevents deterioration of building leading to sustainability.
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