25 Jan AN AMERICAN NATIONAL STANDARD. ASME BTH-1– (Revision of ASME BTH-1–). Design of. Below-the-Hook. Lifting Devices. Buy ASME BTH 1: DESIGN OF BELOW-THE-HOOK LIFTING DEVICES from SAI Global. ASME BTH Design of Below the Hook Lifting Devices Reduced – Download as PDF File .pdf), Text File .txt) or read online.
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Few production environments have the luxury of ordering new equipment to replace existing machines on their shop floor. The need to use peak stresses, rather than average stresses, when calculating static strength shall be determined by a qualified person based on the nature of the detail and the properties of the material being used.
This specification does not address pinned connections.
ASME BTH – Structural engineering other technical topics – Eng-Tips
Tests on overhead cranes Madsen, showed somewhat less severe dynamic loading. With tighter production processes, closer metallurgical control, and better quality checks in current practice, the risk of such failure is reduced. However, the Design Category B design factor does not necessarily account for all adverse environmental effects.
Compression elements that are more slender than are permitted for noncompact shapes may fail by local buckling at stress levels below the yield stress. Thus, the use of Design Category A is restricted to lifting device applications with low numbers of load cycles Service Class 0. The paragraph given after the definition of a term refers to the paragraph where the term is first used. Peak stresses due to discontinuities do not affect the ultimate strength of a structural element unless the material is brittle.
Paragraphs in this Appendix correspond with paragraphs in Chapter 2. The allowable critical stress is the material yield stress divided by the applicable design factor, Nd. Equations through are based on the behavior of beams that are restrained against twist or lateral displacement at the ends of the unbraced length, Lb.
CL hole be other than to require that the strength of the connected pieces within the connection provide a design factor of at least 1. As an example, consider the lifting beam shown in Fig.
This requirement has been established in recognition same the impact that the performance of a lifting device has on workplace safety, the complexity of the design process, and the level of knowledge and training required bgh competently btb lifting devices. Chapter 3 is frequently used in the design of mechanical components to address the strength requirements of the framework that joins the machine elements together.
Fillet welds in holes or slots may be used to transmit shear in lap joints or to prevent the buckling or separation of lapped parts and to join components of built-up members. The joint details in this table include all of the details shown in AWS D No standards have been found for design factors of pneumatic components.
The analysis techniques and models used by the qualified person shall accurately represent the loads, material properties, and device geometry; stress values resulting from the analysis shall be of suitable form to permit correlation with the allowable stresses defined in this Standard.
Classical design aids such as Table 9. Future Committee meeting dates and locations can be found on the Committee Page at http: Crane Manufacturers Association of America, Inc. The AISC specification provides nominal design factors of 1.
The strength factors above are used in formulas bgh diametral pitch. The term VS is the coefficient of variation of the spectrum of loads to which the lifter may be subjected.
Testing to determine the slip resistance is required for slip-resistant connections in which the faying surfaces are painted or otherwise coated Yura and Frank, The allowable bearing stress given by eq. The limits expressed therein are based on Table B5. The allowable moment expression for tees and double angle members [eq.
The level of detail required to provide adequate answers to the questions submitted extends beyond that which can be covered by interpretations of a B30 safety standard. Power supplied to lifting magnets from DC generators can be disconnected by disabling the external power source connected to the generator, or by providing a circuit switch that disconnects excitation power to the generator and removes all power to the lifting magnet.
Please copy and paste this embed script to where you want to embed Embed Script. The correct equation is shown below. Where notation did not exist, unique symbols are defined herein and have been selected to be clear in meaning to the user. The effective weld area for either type is defined as the effective length of weld multiplied by the effective throat thickness. The Service Class establishes allowable stress range values for lifter structural members and design parameters for mechanical components.
ASME-BTH – Free Download PDF
These load conditions are characteristic of use of the lifter in work environments where the weights of the loads being handled are reasonably well known, and the lifting operations are conducted in a controlled manner.
The effects of dust, moisture, and corrosive atmospheric substances on the integrity and performance of a lifter cannot be specifically vth. Allowable stresses or allowable loads in bolts are established as the ultimate tensile strength, the ultimate shear strength, or slip resistance divided by the appropriate design factor.
For I-shape members and channels bent about the major axis and with unbraced lengths that fall in the ranges defined by either eq.
Join your peers on the Internet’s largest technical engineering professional community. AISC defines the same loading conditions, joint categories, and stress C The effective shear area of plug and slot welds shall be considered as the nominal crosssectional area of the hole or slot in the plane of the faying surface.
If two or more of the general types of welds paras. McCabe, Babcock and Wilcox Co. The inquirer may also include any plans or drawings that are necessary to explain the question; however, they should not contain proprietary names or information. This Standard, intended for general industry and construction, sets forth two design categories for lifters based on the magnitude and variation of loading, and operating and environmental conditions.
Fatigue stress on a shaft element shall not exceed the following values: