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Sci Eng Ethics DOI 10.1007/s11948-012-9424-1 ORIGINAL PAPER On Ethics and the Earthquake Resistant Interior Design of Buildings Yonca Hurol Received: 20 September 2012 / Accepted: 10 December 2012  Springer Science+Business Media Dordrecht 2012 Abstract The most common tectonic quality of modern structures, such as frame systems, is their flexibility; they are open for change. Although this characteristic is a big advantage in comparison to the inflexible masonry structures of the past, it might also create some serious problems, such as e.g. the lack of safety in the event of an earthquake, if the flexibility is not used consciously by architects and interior designers. This article attempts to define and establish some rules for the interior design of buildings with reinforced concrete frame systems. The rules for making subtractions from these structures and extending them by making additions to them are contained within this article. The main objective of this article is to derive some ethical values from these rules. Thus, the conclusion of the article focuses on the derivation of some ethical values for achieving earthquake resistant interior design of buildings with reinforced concrete frame systems. Keywords Earthquake resistant design  Interior design  Flexibility  Structural engineering  Reinforced concrete frame Ethics means being open for change. Alain Badiou Introduction ‘‘Recent earthquakes have caused unacceptably high death tolls… reducing such an unacceptably high loss of life from earthquakes is the most important challenge facing the global earthquake engineering community…’’ (Comartin et al. 2004). Y. Hurol (&) Faculty of Architecture, Eastern Mediterranean University, Via Mersin 10, Room: 118, Magusa, Kibris, Turkey e-mail: yonca.al@emu.edu.tr 123 Y. Hurol Steinbrugge stated in 1982 that the twentieth century death toll due to the 26 earthquakes, which had magnitudes between 6.0 and 8.6, was around 1.5 million. Since this problem is not caused only by the structural engineers, professional strategies against earthquakes should include all parties within the design team of buildings: architects, structural engineers and interior architects. Architecture relates to time through change and change in architecture is the basic task of interior design. People need to change their buildings according to their changing needs. If a building is designed for change, its structure is seen as a separate level, which is not necessary to change, whilst changing the other parts of the building (Habraken 1998; Leupen and Bernard 2005). Thus, change does not affect the earthquake resistance of these buildings negatively. However, if change is not planned, then it can cause serious earthquake resistance problems, because the structure is not accepted as a separate ‘‘level’’ and it is manipulated according to the requirements of the new interior design concept. This article focuses on buildings, which are not designed for change and discusses the criteria of the earthquake resistant interior design of such buildings, which have reinforced concrete frame structures. It is known that reinforced concrete frame structures with rigid infill walls form a very critical typology in respect of earthquakes. There are earthquake reports and specifications showing that many reinforced concrete buildings collapsed due to irregularity problems, which are a result of bad design, due to bad construction or due to bad interior design (Paz 1994; ITÜ 1999). The research objective of this article is to formulate the basic rules of achieving the earthquake resistant interior design of buildings with reinforced concrete frame structures and to derive some ethical design values for those professions, which are involved in this building process; viz architects, structural engineers and interior designers. The issues of legality and bureaucracy, as e.g. in the activities of professional chambers and municipalities, are not covered by the scope of this article. Actually, talking about the rules of structural design for architectural purposes is a very old approach. Rules were valid for the design of traditional masonry buildings before modern architecture and before the use of frame structures (Mainstone 1975). Frampton (2001: p. 5) states that we can only talk about the tectonics of modern buildings, but buildings with masonry structures can have ‘stereotomics’ (‘stereos’ to solid and ‘tomia’ to cut) but not tectonics. Modern tectonics has always been seen as the area of freedom in the designing process because of the existence of frame structures with their elementary nature, lightness and flexibility of their partition walls (Billington 1983; Leatherbarrow and Mostafavi 2005). However, after spending a century with these modern frames and after facing many practical problems, as well as having equally valid success stories, it is realistic to start thinking about the necessity for some rules, especially in respect of the issue of earthquake resistant interior design. Freedom should not be understood as just doing anything without being aware and conscious of what is being done (Kavas 1996). Traditional rules were broken only by the greatest masters and on the basis of the demands of kings and sultans (Aran 2000; Goodwin 1993). However, modern rules 123 On Ethics and the Earthquake Resistant should be breakable by any designer, as long as the problem created by the broken rule is compensated for. Thus, the rules defined within this article are not like unbreakable traditional rules. Rather, they should be seen as breakable rules, if the designer is working consciously and with awareness. Having such rules is useful, because they relate theory to practice. This makes theory more pedagogic and suitable for teaching and using in practical designs. It is very healthy for architects, interior designers and structural engineers to discuss the ethics of design in relation to the rules of making changes in a specific type of building, because change is the basic reality of practical life in buildings and it involves all related professions as responsible parties within this action. There is a large volume of literature on the subject of the earthquake problems of frame structures (Athanassiadou 2008; Ambrose and Vergun 1993, 1995, 1999; Dowrick 1990; Hu et al. 1996), frames with masonry infill (Ravichandran and Klingner 2012), strengthening or retrofitting frame structures (Kaushik et al. 2009; Martinezrueda and Elnashai 1995; Miller and Reaveley 1996; Warner 1996), experience gained through specific cases of earthquakes (such as ITÜ 1999) and earthquakes as a city planning problem (Charleson 2009). However, there is a gap in the literature in respect of earthquake problems due to changes in architecture as a result of the interior design of a building. There is also literature on professional ethics in architecture and structural engineering (Martin and Schinzinger 2005; Pultar 1997, 2000). However, these do not consider the issue of change in buildings. This article is an original work, because it works on this gap and it adapts the old idea of rules to the professional ideology of modern design within the three related professions. The author of this article is an architect who has taught structures to architecture and interior architecture students for 28 years. These courses have been taught as ‘‘tectonics’’ courses rather than classical statics, strength, structural analysis courses during the last 8 years. They are also related to design studios. The author of this article also teaches design, attends to design juries and has the opportunity of relating the theory of structures to the design practice of architecture and interior architecture. Thus, the methodology of collecting and evaluating data to write this article can be defined as an active observation within a long teaching experience of structures and design. The article contains five headings: The nature of interior design from the point of view of structures, the rules of making subtractions from the existing structure, the rules of making additions to the existing structure, the methods of compensating for the broken rules and a discussion on the ethics of designing buildings with reinforced concrete frames for all related professions. The Nature of Interior Design from the Point of View of Structures The architectural design of structures is usually seen as the addition of pieces of structure to each other. These pieces can be similar to each other, or they can also be very different from each other. It is possible to have many bays of frames added to each other to form a 3D frame. It is also possible to add domes and vaults to frames 123 Y. Hurol (Lin and Stotesbury 1981). However, structural design in interior design, which creates extension systems (Mornement 2007) cannot only be explained by adding structures to each other. Since the object of interior design is an existing building, it becomes possible or necessary to subtract pieces from the existing building structure. Interior designers usually imagine the subtractions first and then design the necessary additions. It has been observed that the problems associated with earthquakes, which arise in the design projects of interior architecture students, can be categorised into two groups: a. Problems due to the subtractions made from the existing building structure, b. Problems due to the additions made to the existing building structure. Thus, the rules of earthquake resistant interior design should also contain rules in respect of subtraction from the existing building structure and rules of addition to the existing building structure. On Subtractions from the Existing Building Structure Observation of the student projects show that there is a large variety of subtraction problems in interior design. All elements of the buildings can be subtracted by the students; columns, beams, slabs, stairs, rigid infill walls and light-weight infill walls. Actually all of these actions are possible, if the technology available is fully utilised, if there is official permission and if the client is prepared to pay for the cost of this. Even during the first half of the twentieth century, La Maison de Verre, which was a masonry building, was elevated with the help of a temporary structure and a frame structure was built underneath it in order to meet the demands of a bohemian family (Neumann et al. 2010). Many rules, which are set within this article, were broken within this project. However, this was done consciously and the broken rules were compensated for. This approach to change was holistic in its nature. Not only were one or two columns removed but the construction process was also seen as a part of design. On the other hand, studio projects in interior design education do not usually assume conditions as such. Although they are more realistic in many issues, they might ignore structural problems for the sake of teaching the art of design. This is part of the professional ideology of design, which is transferred to students during design education (Stevens 1998). If there are restrictions in the budget of the project, if there are no special official permissions and if the technology to be used is limited, then it is possible to list the rules of subtraction in interior design as follows: a. No columns and beams should be subtracted, Even if the building is not in an earthquake region, subtracting columns will disturb the structure. There might be other columns sitting on that column. The beams, which transfer their load to that column, do not have sufficient depth and reinforcement to carry their new load without that column. If vertical elements of a 123 On Ethics and the Earthquake Resistant structure are removed, then they have to be replaced somehow as in the case of La Maison de Verre. Even if the building is not in an earthquake region, the subtraction of beams will disturb the formation of the frames, the connection between the frames and the way slabs are supported. Having continuous frames from one side to the other side of the buildings is a very important requirement in respect of the issue of earthquake resistance (Ministry of Public Works and Settlement Government of the Republic of Turkey 1997). Such problems can be discussed for each particular structure. However the general reason for not removing columns and beams from a structure is the rule, which forms the base of professional ethics: All buildings must be built according to the professional projects, which were designed for them. The only way of not following this rule is to prepare another set of professional projects, which will enable the required change (Martin and Schinzinger 2005; Pultar 1997, 2000). b. A slab can be removed as a whole or a small piece of it can be subtracted. In any case, before deciding to make changes in slabs, it is necessary to get advice from a structural engineer. Reinforced concrete slabs have reinforcement in them. If the majority of the reinforcement in one direction is cut, this causes a radical change to the original composition of the slab, which is according to the professional projects. On the other hand, removing many slabs from a building can also change the earthquake resistance of that building, because slabs work as diaphragms connecting vertical elements in the structure. The removal of slabs can stop the structure from behaving as a unit (Dowrick 1990). Unless only small holes in the slabs (e.g. to pass pipes) are required to be made, the professional advice of a structural engineer is required, since more reinforcement is required when larger holes are made. c. Stairs can be subtracted, if their removal does not weaken the remaining parts of the existing structure. Before deciding to remove stairs, it is necessary to get advice from a structural engineer. Stairs represent sculptural artistic elements for interior designers. Whenever there is an interior design project, the old stairs are usually removed and new more artistic ones are added. (Mornement 2007) The stairs designed by interior designers always have light-weight structures. The major problem in removing the old stairs and adding the new one arises in relation to the role of the old stairs within the original structure. For example, if it is located within a staircase tower, then removing the stairs and leaving a hollow tower, damages the structure of that tower. Thus, it is again necessary to get advice from a structural engineer before removing stairs. d. Rigid infill walls can be removed if this action does not create a soft/weak storey or twisting instability problems. Before deciding to remove rigid infill walls, it is necessary to get advice from a structural engineer. There is a preconception amongst architects, interior designers and laymen that the removal of the infill walls does not affect the building structure. Thus, they are usually removed without getting any advice. However, removal of rigid infill walls 123 Y. Hurol can cause vertical irregularity and plan irregularity problems, which are also known as soft/weak storey and twisting instability problems (Kirac et al. 2011; Jeong and Elnashai 2007; Lee and Woo 2002; Negro and Verzeletti 1996; Papia et al. 2003). Thus, the removal of rigid infill walls requires the advice of a structural engineer. e. Light-weight infill walls can be subtracted freely. It can be said that the only totally free action that the interior designers can perform is the removal of the light-weight infill walls. Both rigid and light-weight infill walls can be preferred in an open building design (Habraken 1998; Leupen and Bernard 2005). On Additions to the Existing Building Structure Students of interior design usually feel free to add new structures to the existing building structure. Linear elements, surfaces or masses can be added to the existing building structure. These additions can be within the structure, outside the structure or they can originate from the inside and extend outside. In structural terms, columns, beams, slabs, stairs and infill walls can be added to the existing structure. Whatever their form, these structures can be described as extension systems, because they are added to the existing structure and they are dependent on it (Mornement 2007). a. All these additional structures should be connected only to the joints of the existing building structure. These additions have to be connected to the existing structure in order to avoid separate behaviour of the old and new structures in the event of an earthquake. They have to be connected to the joints of the existing structure in order to avoid any disturbing load transfer between them. New beams should be connected to existing beam column joints. On the other hand, the additional steel columns should transfer their load to appropriate places in the foundations of the existing structure. If there is no element to transfer this load, this means that the foundations of the existing building also require some extensions. Even the addition of light-weight partition walls require proper connections to the existing structure in order to guarantee their safety during an earthquake. b. The additional structure should have an order so that a second system, which is connected to the existing building system, can be formed (Ching 1996). Earthquake specifications support the suggestion of this rule. Many earthquake specifications contain statements about the formation of frames within a structure. Planar frames which usually exist in two perpendicular directions should start from one side of the building and end at the other end of it in order to have a consistent frame system (Ministry of Public Works and Settlement Government of the Republic of Turkey 1997). It is known that most of the buildings, which collapse in earthquakes, have non-continuous frames in them (ITÜ 1999). 123 On Ethics and the Earthquake Resistant However, structural rules when a change in an existing structure occurs cannot be the same as the structural rules of constructing a new building. The rules of addition are different from the rules of an initial design. c. Extensions of existing structures should be light-weight structures (Habraken 1998; Leupen and Bernard 2005). It is not a good idea to add stone walls irregularly onto existing structures. The additions should not change the centre of gravity of the existing structure so as not to create a twisting instability problem (Jeong and Elnashai 2007). It is also not a good idea to add rigid infill walls to the existing structure so as not to create any vertical irregularity problems such as soft and weak storey problems (Kirac et al. 2011). Thus, interior architecture structures are different from the structures used in architecture. Interior design requires light weight structures such as geodesic domes, bicycle-wheel structures, membranes, suspension structures, steel frames and slabs. d. All load-bearing additions to the existing building structure require a new structural engineering project as well as a new interior design project. This structural engineering project should consider both the effect of subtractions from the existing structure and any additions to it. This is the requirement of the basic code of rules of professional ethics, according to which there should not be any difference between a building and the professional project, which was designed for it. Thus, changes in buildings also require professional projects (Habraken 1998). Ways of Compensating for Broken Rules Most of the above rules are also valid for non-earthquake regions. The only rules, which apply to earthquake regions and not to non-earthquake regions, are the ones about subtraction and addition of rigid infill walls. Rigid infill walls can be freely subtracted and added in non-earthquake regions, but not in earthquake regions. Thus, there is a considerable difference between architectural design and interior design in earthquake and non-earthquake regions. Thus, open building design in earthquake regions should be based on the use of light-weight infill walls. According to modern ideology many rules are breakable. Some of the above rules can also be broken in order to achieve certain design objectives. Actually the rules form challenging limits to be broken by modern designers and engineers. The only rule, which is unbreakable, is that which requires the production of a new set of interior design and structural design projects, if there is to be any change in the existing, original structure. In order to break the rules, the rules should be known by the designers. If the rules are broken, they should be compensated for by taking some structural precautions. Such precautions combine design creativity and innovation with each other. Either a new system is designed to compensate for the broken rule (such as the systems which were designed to carry buildings from one place to another 123 Y. Hurol place), or rules of a previously invented system are used to compensate for the broken rule. Thus, breaking a rule necessitates the invention of new additional systems which have their own rules. Conclusion Investigating ethical values, which affect building activity, cannot be completed without considering the real life process of buildings. Ethics has a lot to do with time. In fact, the major turning points of building ethics can only be achieved through considering the real life process of buildings. Analysis of the above text concerning the rules of earthquake resistant interior design, led the author of this text to derive and formulate the major statements of ethics, which can be discussed in order to develop the basic ethical values for building and construction activity, which also covers the integrated activities of architects, structural engineers and interior designers. These statements are as follows: a. b. c. d. e. f. Freedom is the base of ethics. However freedom does not mean doing whatever one wishes without thinking of others (Kavas 1996). People should be free to make small changes in their activities without affecting others negatively (Heidegger 1995). Ethics is being open for making changes and accepting changes made by others (Badiou 2002). This statement does not necessarily conflict with the requirement of consistency in respect of ethical behaviour. One can have a very consistent routine in his/her activities, but still can be open to change in order to produce a better work (Heidegger 1995). If the building is designed for change (as an open building or as a piece of time based architecture), with light-weight infill walls, then the interior design of that building can be realized without affecting the structural system. In this case it is possible to complete the interior design only by subtracting and/or adding some light-weight infill walls. If the building is not designed for change and if it is necessary to go beyond removing and adding some light-weight infill walls, then the interior design of that building should be carried out parallel to a structural engineering project designed for it. The rules of earthquake resistant interior design, which are about the physical building, can be broken by compensating for them by using the rules of another system, The rule in respect of the need for a structural engineering project cannot be broken. In other words, the only way of breaking this rule is to redesign the initial architectural project so as to be able to make a change. The hierarchy between these statements, the different phases in the life time of buildings and the consideration of the co-existence of different professions, which are involved within the building process, can lead towards the development of ethical values for the building activity. For the initial architectural design phase, it is possible to say that: 123 On Ethics and the Earthquake Resistant a. It is ethical for architects to design for change whether they are in an earthquake region or not. Change is needed by everyone. However, designing for change in earthquake regions is even more necessary. b. Architects who design for earthquake zones should give preference to using light-weight infill walls rather than rigid ones. c. If there is no obligatory law which prohibits the removal and/or addition of the rigid infill walls freely, then the initial building‘s structural engineer should design all necessary levels as soft/weak storey type. It should be known that even the walls of intermediate levels can be removed later. For the phase of interior design, it can be stated that: d. If a building is designed for change, then interior architects should redesign the interiors of it only by removing and/or adding light-weight infill walls. e. If a building is not designed for change and if it is necessary to go beyond removing and/or adding light-weight infill walls, then it is necessary to have a new structural engineering project for that interior design. f. All the rules of earthquake resistant interior design, except the rule for the need for a structural engineering project, can be broken by compensating them with the rules of another system. g. The rules of earthquake resistant interior design should be broken in a systematic way and only for conceptual design purposes. Design alternatives, in which no rules are broken, should also be presented to the clients besides the design alternatives, in which one or more rules are broken. h. The ethical tendency of structural engineers should be either not to break any rules of earthquake resistant interior design, or to compensate for them in a healthy way. 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