Synopsis: The structural design for the East Addition to the St. Cloud Hospital facility in central Minnesota incorporated punching shear and cracked section design criteria that are not currently specified in ACI 318-05. The complexity of the column layout and shallow floor-to-floor spacing were the primary reasons for choosing a twoway 12 in. (300 mm) reinforced concrete flat slab for the 450...

BACKGROUND The meniscus plays a crucial role in knee joint stability, load transmission, and stress distribution. Meniscal tears are the most common reported knee injuries, and the current standard treatment for meniscal deficiency is meniscal allograft transplantation. A major limitation of this approach is that meniscal allografts do not have the capacity to remodel and maintain tissue homeos...

Taking hydraulic punching test of Zhaozhuang Mine as engineering background, by comparing the field application effects different processes, relationship between coal moisture content around borehole blockage and gas extraction effect was monitored analyzed. The following conclusions were drawn: occurrence result comprehensive action slag particle size discharge capacity return water. Blocking ...

The purpose of this study is to examine means creating light and very strong prestressed concrete slabs made lightweight aggregate mixed with short fibers. experiments reported in paper demonstrated that the ratio fibers mix must be kept 0.5 vol% or less, order obtain same strength as by designed a standard 50 N/mm2. In addition, results load testing various confirmed PC PVA had punching shear ...

Many building codes rely on empirical formulations with respect to the punching shear design provisions. Such empirical equations are typically calibrated on the basis of laboratory tests performed on simplified geometries (usually isolated specimens) with usually statically-determined loading conditions. On the contrary, actual structures, particularly two-way slabs, are continuous and highly ...

BACKGROUND The aim of the study was to answer the question of whether earplugs provide sufficient protection in the exposure to impulse noise generated during metalworking processes. MATERIAL AND METHODS The noise generated by die forging hammer and punching machine was characterized. Using an acoustic test fixture, noise parameters (LCpeak, LAmax) under 24 earplugs, foam, winged and no-roll,...

SYMPOSIUM PROCEEDINGS 1970 The aids to easy and accurate punching are twofold. For as many programmes as practicable, proformas are prepared whcre card columns arc idcntified and the entries to be made in each group of columns corresponding to the value of a variable are clearly defined. Fig. 3 gives a typical proforma used for the closed circuit respiration chamber programme, CCRC3. Note that ...

Abstract The Critical Shear Crack Theory (CSCT) has been developed since 1985 to assess the shear resistance of members without reinforcement and punching reinforced concrete slabs in a rational manner. main idea CSCT is that governed by development critical crack, its geometry kinematics. Recent tests with detailed measurements have confirmed force can be carried through crack combination aggr...