[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"detail-sidebar-cat-0-en-105":3,"doc-seo-650952-105":59,"doc-detail-650952-en":130},{"code":4,"msg":5,"data":6},0,"success",[7,13,18,23,28,33,38,43,48,51,55],{"id":8,"doc_module":4,"doc_module_name":9,"category_name":10,"show_sort_weight":11,"slug":12},1,"Document","Story & Novel",90,"story-novel",{"id":14,"doc_module":4,"doc_module_name":9,"category_name":15,"show_sort_weight":16,"slug":17},2,"Literature",80,"literature",{"id":19,"doc_module":4,"doc_module_name":9,"category_name":20,"show_sort_weight":21,"slug":22},4,"Exam",70,"exam",{"id":24,"doc_module":4,"doc_module_name":9,"category_name":25,"show_sort_weight":26,"slug":27},5,"Comic",60,"comic",{"id":29,"doc_module":4,"doc_module_name":9,"category_name":30,"show_sort_weight":31,"slug":32},6,"Technology",50,"technology",{"id":34,"doc_module":4,"doc_module_name":9,"category_name":35,"show_sort_weight":36,"slug":37},7,"Healthcare",40,"healthcare",{"id":39,"doc_module":4,"doc_module_name":9,"category_name":40,"show_sort_weight":41,"slug":42},8,"Research & Report",30,"research-report",{"id":44,"doc_module":4,"doc_module_name":9,"category_name":45,"show_sort_weight":46,"slug":47},9,"Religion & Spirituality",20,"religion-spirituality",{"id":46,"doc_module":4,"doc_module_name":9,"category_name":49,"show_sort_weight":46,"slug":50},"World Cup","world-cup",{"id":52,"doc_module":4,"doc_module_name":9,"category_name":53,"show_sort_weight":52,"slug":54},10,"Lifestyle","lifestyle",{"id":56,"doc_module":4,"doc_module_name":9,"category_name":57,"show_sort_weight":24,"slug":58},19,"General","general",{"code":4,"msg":60,"data":61},"ok",{"site_id":62,"language":63,"slug":64,"title":65,"keywords":66,"description":67,"schema_data":68,"social_meta":123,"head_meta":125,"extra_data":127,"updated_unix":129},105,"en","standard-precast-staircases-chapter-3-construction-and-design-considerations","Standard Precast Staircases - Chapter 3 - Construction and Design Considerations","","Chapter 3 outlines why precast staircases are used to speed construction and improve site access. It explains key architectural design considerations, including standardization through an architectural reference sheet and reduced in-situ construction errors such as inconsistent riser heights. It further covers structural design aspects: slab spanning behavior, load assumptions for dead load versus live and finishing loads, effective span and thickness relationships, reinforcement basis for nibs, and recommended standard dimensions for residential, commercial, and institutional projects.",{"@graph":69,"@context":122},[70,84,105],{"@type":71,"itemListElement":72},"BreadcrumbList",[73,77,79,82],{"item":74,"name":75,"@type":76,"position":8},"https://docshare.wps.com","Home","ListItem",{"item":78,"name":9,"@type":76,"position":14},"https://docshare.wps.com/document/",{"item":80,"name":40,"@type":76,"position":81},"https://docshare.wps.com/document/research-report/",3,{"item":83,"name":65,"@type":76,"position":19},"https://docshare.wps.com/document/standard-precast-staircases-chapter-3-construction-and-design-considerations/650952/",{"url":83,"name":65,"@type":85,"image":86,"author":91,"headline":65,"publisher":94,"fileFormat":97,"inLanguage":63,"description":67,"dateModified":98,"datePublished":99,"encodingFormat":97,"isAccessibleForFree":100,"interactionStatistic":101},"DigitalDocument",{"url":87,"@type":88,"width":89,"height":90},"https://docshare.wps.com/thumbnails/standard-precast-staircases-chapter-3-construction-and-design-considerations/650952.png","ImageObject",300,407,{"name":92,"@type":93},"Himbo","Person",{"url":74,"name":95,"@type":96},"DocShare","Organization","application/pdf","2026-10-30","2026-10-24",true,{"@type":102,"interactionType":103,"userInteractionCount":19},"InteractionCounter",{"@type":104},"ViewAction",{"@type":106,"mainEntity":107},"FAQPage",[108,114,118],{"name":109,"@type":110,"acceptedAnswer":111},"Why are highly skilled workers needed for in-situ staircase construction, and how do precast staircases help?","Question",{"text":112,"@type":113},"In-situ construction requires skilled carpentry because the staircase step configuration cannot be formed without it, which increases construction duration. Precast staircases shorten construction time and provide instant operational access to all floor areas.","Answer",{"name":115,"@type":110,"acceptedAnswer":116},"How does the chapter describe the architectural approach to standard precast staircases?",{"text":117,"@type":113},"Architects can specify standardized precast staircases using an architectural reference sheet (ST01) rather than detailing each staircase. After determining floor-to-floor height, the drawings indicate the staircase component type for the contractor to purchase off the shelf.",{"name":119,"@type":110,"acceptedAnswer":120},"What structural design factors are emphasized for precast stair slabs?",{"text":121,"@type":113},"The chapter discusses spanning behavior into landings or between supporting beams, design after the main structure with pockets/recesses, and load calculations based on sloping dead loads and plan-area-based live and finishing loads. It also defines effective span measurement and span-effective depth ratio guidance, plus reinforcement approaches for nibs.","https://schema.org",{"og:url":83,"og:type":124,"og:title":65,"og:site_name":95,"og:description":67},"article",{"robots":126,"canonical":83},"index,follow",{"doc_id":128,"site_id":62},650952,1792898067,{"code":4,"msg":5,"data":131},{"doc_id":128,"user_id":132,"nickname":92,"user_avatar":133,"doc_module":4,"category_id":39,"category_name":40,"doc_title":65,"doc_description":67,"doc_content":134,"file_id":135,"file_url":136,"file_type":137,"file_size":138,"view_count":19,"is_deleted":4,"is_public":8,"is_downloadable":8,"audit_status":8,"page_count":139,"language":140,"language_code":63,"site_id":62,"html_lang":63,"table_of_contents":141,"faqs":142,"seo_title":143,"seo_description":67,"update_tm":144,"read_time":145},687197100911,"https://ap-avatar.wpscdn.com/avatar/a000239b6f1da00475?x-image-process=image/resize,m_fixed,w_180,h_180&k=1785132997149421697","STANDARDPRECASTSTAIRCASES  \n|  |  |  |\n| --- | --- | --- |\n|  | STANDARD PRECAST STAIRCASES   |  |\n|  |  |  |\n\nCHAPTER3  \nHighly skilled workers are required to construct staircases in-situ because the step configurationof staircases could not be possibly made without skilled carpentry.The result is longerconstruction duration.  \nUsing precast staircases will shorten the construction duration.It also allows operational accessinstantly to all floor areas.When constructed as non-critical structural components,stairwells can beused as access for the delivery of construction materials.  \n# 3.1 Architectural Design Considerations\n\nThe proposed standard precast concrete staircase is designed for use in residential,commercial andinstitutional developments.It is possible for an architect to specify standardised precast staircasesaccording to Architectural Reference Sheet ST01,instead of detailing staircases.Once the floor tofloor height is determined,the architect would merely have to indicate the type of staircasecomponents on the drawings and the contractor can then buy these components off the shelf fromthe precaster.Using precast components would also eliminate the frequent construction errors inriser height in in-situ construction.  \n    STANDARD PRECAST STAIRCASES                        \n# 3.2 Structural Design Considerations\n\nPrecast stair slabs are usually designed to span longitudinally into the landings at right angles to thestair flights or span between supporting beams.In monolithic construction,the stair slab can bedesigned with continuous end restraints over the supports.But in instances where staircases areprecast,the construction is generally carried out after the main structure,with pockets or recessesleft in the supporting slabs or beams to receive the stair flights.With no appreciable end restraints,a precast stair slab could therefore be designed as simple slab between supports.  \nIn design,the dead load is calculated along the sloping lengths of the stairs but the live and finishingloads are based on plan area.If the risers were to be covered with finishes,additional loads wouldhave to be added in the design.  \nThe effective span is measured horizontally between the centres of the supports or the actualhorizontal length of the precast stair slab where dry connections are used at the supports.Thethickness of the waist is taken as the slab thickness.  \nThe basic span-effective depth ratio may be increased by 15%to 23(=20×1.15)if the stair flightoccupies at least 60%of the span.This willapply to precast stair slabs without landings.  \nThe supporting nibs of the precast stair slab may be constructed with either dry or wet connections(extended bearings).The design of reinforcement of the nibs can be based on:  \n·   Simple bending  \nStrut and tie force model  \n·    Shear friction  \nTheories and examples of the various design approaches can be obtained in the Structural PrecastConcrete Design Handbook by BCA.Small diameter rebars should be used at the nibs as a resultof the structural dimensions adopted.  \n\n|  |  |\n| --- | --- |\n|  | STANDARD PRECAST STAIRCASES   |\n|  |  |\n\n# 3.3 Standard Precast Staircase Dimensions\n\nIn practice,the number of risers and the riser height of a staircase have always been dictated by thestorey height of a building.This would result in different riser dimensions.Prefabricating stair flightswith many different riser dimensions would not be economically viable.  \nStandard precast staircases for residential projects have already been developed by Housing andDevelopment Board(HDB)and the private sector.The main difference between HDB housing andprivate housing is the variation in floor to floor height.As most private developers prefer higherheadroom,the number of risers and the riser height would vary accordingly.  \nThe Committee considered the design aspects related to the aesthetic,fabrication,handling anderection of precast staircases and incorporated the following two distinct architectural ","cbCainSlL7umBEWK","https://ap.wps.com/l/cbCainSlL7umBEWK","pdf",20344478,28,"English","# 3.1 Architectural Design Considerations\n# 3.2 Structural Design Considerations\n# 3.3 Standard Precast Staircase Dimensions\n# 3.4 Prefabrication and Labelling","[{\"question\":\"Why are highly skilled workers needed for in-situ staircase construction, and how do precast staircases help?\",\"answer\":\"In-situ construction requires skilled carpentry because the staircase step configuration cannot be formed without it, which increases construction duration. Precast staircases shorten construction time and provide instant operational access to all floor areas.\"},{\"question\":\"How does the chapter describe the architectural approach to standard precast staircases?\",\"answer\":\"Architects can specify standardized precast staircases using an architectural reference sheet (ST01) rather than detailing each staircase. After determining floor-to-floor height, the drawings indicate the staircase component type for the contractor to purchase off the shelf.\"},{\"question\":\"What structural design factors are emphasized for precast stair slabs?\",\"answer\":\"The chapter discusses spanning behavior into landings or between supporting beams, design after the main structure with pockets/recesses, and load calculations based on sloping dead loads and plan-area-based live and finishing loads. It also defines effective span measurement and span-effective depth ratio guidance, plus reinforcement approaches for nibs.\"}]","Standard Precast Staircases - Chapter 3 - Construction and Design Considerations | PDF",1792854895,71]