gantry girder.ppt
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This document provides design considerations for gantry girders, which are laterally unsupported beams subjected to both vertical and horizontal loads. It outlines the key components of overhead cranes that impose loads on gantry girders. The document then describes the steps to design gantry girders, which include determining maximum wheel loads, calculating bending moments, selecting a trial cross section, checking the section's moment capacity, and verifying the top flange and web can resist buckling from applied loads and stresses. Deflection is also checked under working loads.
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Self-compacting concrete (SCC) is a highly flowable concrete that can spread into place and fill formwork without any mechanical consolidation. SCC was developed in Japan in the 1980s to overcome issues with inadequate consolidation of traditional vibrated concrete. SCC uses special admixtures and optimized aggregate gradation to achieve excellent flowability, passing ability, and segregation resistance. While SCC has higher material costs, it provides benefits of easier placement, improved quality, reduced labor requirements, and faster construction.
seminar topic on high density concrete-
This document discusses high density concrete, which has a density of at least 3360-3840kg/m3 compared to the 2400kg/m3 density of conventional concrete. High density concrete uses heavy aggregates like magnetite, iron ore, or manufactured aggregates like iron or lead shot. It can achieve densities up to 5900kg/m3 with iron aggregates or 8900kg/m3 with lead shot aggregates. High density concrete has applications as radiation shielding and in situations where space is limited but high strength is needed. However, it is more expensive than conventional concrete due to the dense aggregates used.
oil palm shell concrete oil palm shell concrete
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Agricultural-Waste-and-Industrial-Waste-in-construction.pptx
This document discusses various agricultural and industrial wastes that can be used as construction materials. It provides details on sugarcane bagasse, rice husk, straw bale, coir fiber, fly ash, blast furnace slag, red mud, marble powder waste, newspaper wood, nappy roofing, recycled plastic bottles and blood bricks. For each material, it describes how it is produced as a waste, its composition, and advantages of using it in construction such as cost-effectiveness, sustainability and improved mechanical properties of construction elements.
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Water pollution and its management - a open elective
Rainwater harvesting is defined as the collection, concentration, storage, and use of rainwater. There are various traditional and modern methods of rainwater harvesting in India. Rooftop rainwater harvesting systems collect rainwater from building roofs and divert it into storage tanks or groundwater recharge systems. Micro level rainwater harvesting involves collecting rainwater directly from small rooftop catchment areas and storing it in underground tanks on site. Rainwater harvesting provides numerous benefits but requires proper design of catchment areas, transport systems, filters, and storage to effectively harvest and utilize rainwater.
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CalArts毕业证学历书【微信95270640】CalArts毕业证’圣力嘉学院毕业证《Q微信95270640》办理CalArts毕业证√文凭学历制作{CalArts文凭}购买学历学位证书本科硕士,CalArts毕业证学历学位证【实体公司】办毕业证、成绩单、学历认证、学位证、文凭认证、办留信网认证、（网上可查，实体公司，专业可靠）
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5:凡事获得留信网入网的信息将会逐步更新到个人身份内，将在公安局网内查询个人身份证信息后，同步读取人才网入库信息
6:个人职称评审加20分
7:个人信誉贷款加10分
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gantry girder.ppt
- 1. Design of Gantry Girders 1
- 2. 2
- 3. 3 FEATURES • Design of Gantry Girder is a classic example of laterally unsupported beam. • It is subjected to in addition to vertical loads horizontal loads along and perpendicular to its axis. • Loads are dynamic which produces vibration. • Compression flange requires critical attention.
- 4. Components of an Overhead Crane 4
- 6. Loads on Gantry Girder 6
- 8. Max. S.F., B.M., and Deflection 8
- 9. Two Cranes at the Same Span 9
- 10. Max. BM for Two Cranes At the Same Span 10
- 12. Profiles Used for Gantry Girders 12
- 13. Steps for Design Assume that the lateral load is resisted entirely by the top flange of the beam plus any reinforcing plates, channels etc. and the vertical load is resisted by the combined beam. 1. Find the maximum wheel load: This load is maximum when the trolley is closest to the gantry girder. Increase it for the impact 2. Calculate the maximum bending moment in the gantry girder due to vertical loads. 3. To simplify the calculations, add the maximum bending moment due to dead load to the maximum wheel load moment 13
- 14. Steps for Design (cont.) 4. The maximum shear force is calculated. When the gantry is not laterally supported, the following may be used to select a trail section. Zp = Mu / fy Zp (trial) = k Zp (k = 1.40-1.50) Economic depth ≈ 1/12th of the span. Width of flange ≈ 1/40 to 1/30th of the span 5. The plastic section modulus of the assumed combined section Mp = Zp fy where Zp is called the plastic modulus 14
- 15. Steps for Design (cont.) 6. Check for moment capacity of the whole section (as lateral support is provided at the compression flange) Mcz = βb Zp fy ≤ 1.2 Ze fy / γm0 <Mu 7. Check top flange for bending in both the axes using the interaction equation (My / Mndy)+ (M2/Mndz) ≤ 1.0 8. If the top (compression) flange is not supported, Check for buckling resistance in the same way as in step 6 but replacing fy with the design bending compressive stress fbd. 15
- 16. Steps for Design (cont.) 9. Check web of the girder at points of concentrated load for local buckling or local crushing, and provide load carrying/ bearing stiffeners, if necessary. 10. Check for deflection under working loads 16
- 17. 17 THANK YOU!